CN113628489A

CN113628489A - Method for modifying 10kV power distribution system into high-voltage electrician practical operation examination system

Info

Publication number: CN113628489A
Application number: CN202110922070.2A
Authority: CN
Inventors: 谭世海; 杨启军; 熊隽迪; 冉懋海; 马泽菊; 刘长河; 谭棋
Original assignee: Chongqing Electric Power College
Current assignee: Chongqing Electric Power College
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2021-11-09
Anticipated expiration: 2041-08-12
Also published as: CN113628489B

Abstract

The invention relates to a method for modifying a 10kV power distribution system into a high-voltage electrician practice test system, which comprises the following steps: providing a control box for providing a secondary voltage and a secondary current required by analog detection of a primary voltage and a primary current for a 10kV power distribution system; removing fuses on the secondary sides of the voltage transformers in the functional cabinets, short-circuiting secondary terminals of the current transformer body, and disconnecting the voltage transformers and the leads connecting the secondary sides of the current transformers and the terminal rows; and the secondary voltage loop and the secondary current loop of the measuring instrument, the measuring instrument and the protective instrument of each functional cabinet are electrically connected with the control box. After the modification, the scene of operating, controlling, measuring and protecting the 10kV power distribution system can be simulated under the condition that the power distribution system is not connected with the 10kV high voltage at one time, the safety of the actual operation check of a special operation field of a high-voltage electrician is ensured, meanwhile, the authenticity of the actual operation check is greatly increased, the modification step is simple, and the energy-saving performance is good.

Description

Method for modifying 10kV power distribution system into high-voltage electrician practical operation examination system

Technical Field

The invention belongs to the technical field of high-voltage power distribution, and relates to a method for modifying a 10kV power distribution system into a high-voltage electrician practice test system.

Background

When a high-voltage electrician special operation practical test is carried out, the practical operation test needs to be carried out on a 10kV power distribution system, as shown in fig. 1, the 10kV power distribution system generally comprises five functional cabinets, namely an incoming line cabinet 200, a PT cabinet 300, an outgoing line cabinet 400, a connection cabinet 500 and an isolation cabinet 600, and a voltage transformer and a current transformer with each function obtain secondary voltage (100V) and secondary current (5A) from primary high voltage and primary high current induction on a 10kV line and provide the secondary voltage and the secondary current for instruments for measurement, protection, metering and the like to carry out measurement; because the primary side of a 10kV power distribution system needs to be connected with 10kV high voltage, if the operation is improper, electric shock safety accidents are easily caused, great safety risks exist in the actual operation examination, the examination is generally carried out in the state of no electricity at the primary side, so that the states of related measuring instruments, protective instruments and measuring instruments of a functional cabinet cannot be checked, a reference person cannot personally feel the actual condition of the operation, the operation condition of the reference person cannot be judged, and the examination in the state of no electricity at the primary side cannot cause the attention of the reference person, so that the examination cannot achieve the expected effect.

Disclosure of Invention

In view of the above, the present invention provides a method for modifying a 10kV power distribution system into a high-voltage electrician practice test system, which enables the 10kV power distribution system to simulate real operation conditions without connecting to high voltage.

In order to achieve the purpose, the invention provides the following technical scheme:

a method for modifying a 10kV power distribution system into a high-voltage electrician practical operation examination system, wherein the 10kV power distribution system comprises an incoming line cabinet, a PT cabinet, an outgoing line cabinet, a contact cabinet and an isolation cabinet, and the method comprises the following steps:

providing a control box, wherein the control box is used for providing secondary voltage and secondary current required by analog detection of primary voltage and primary current for a 10kV power distribution system;

removing a fuse of the secondary side of the voltage transformer in the incoming line cabinet, short-circuiting a secondary terminal of the current transformer body, disconnecting the voltage transformer and a lead of the secondary side of the current transformer, which is connected with the terminal row, and insulating and binding;

removing a secondary side fuse of a voltage transformer in the PT cabinet, disconnecting a lead of which the secondary side is connected with a terminal row and binding the lead in an insulating way;

the current transformer and the zero sequence current transformer in the outgoing line cabinet are short-circuited, and the wires connecting the secondary side of the current transformer and the zero sequence current transformer with the terminal row are disconnected and insulated and bound;

short-circuit connecting a secondary terminal of a current transformer body in the contact cabinet, removing a lead of which the secondary side of the current transformer is connected with a terminal row and insulating and binding the lead;

and the secondary voltage loop and the secondary current loop of the high-voltage electrified display, the measuring instrument, the metering instrument and the protection instrument of the incoming line cabinet, the PT cabinet, the outgoing line cabinet, the connection cabinet and the isolation cabinet are electrically connected with the control box.

Furthermore, a miniature circuit breaker, a voltage unit, a current unit and a control unit are arranged in the control box, the input end of the miniature circuit breaker is respectively used for connecting an external 380V power supply voltage, the output end of the miniature circuit breaker is respectively electrically connected with the voltage unit, the current unit and the control unit, the voltage unit is used for providing secondary voltage required by voltage detection for a 10kV power distribution system, and the current unit is used for providing secondary current required by current detection for the 10kV power distribution system; and the control unit is used for controlling the on-off of the secondary voltage and the secondary current loop of each cabinet body in the 10kV power distribution system.

Furthermore, the control unit comprises at least one contactor control module, the contactor control modules correspond to the 10kV power distribution system one by one, a first power end of each contactor control module is electrically connected with one phase line output end of the miniature circuit breaker, and a second power end of each contactor control module is electrically connected with a zero line output end of the miniature circuit breaker;

the contactor control module comprises a coil of a first alternating current contactor, a coil of a second alternating current contactor, a coil of a third alternating current contactor, a coil of a fourth alternating current contactor, a coil of a fifth alternating current contactor and a coil of a sixth alternating current contactor;

the first power end of the contactor control module is electrically connected with a first normally-open auxiliary contact of an incoming line cabinet handcart, the first end of a coil of the first alternating current contactor is electrically connected with a second normally-open auxiliary contact of the incoming line cabinet handcart, and the second end of the coil of the first alternating current contactor is electrically connected with a second power end of the contactor control module;

the first end of the coil of the first alternating current contactor is also electrically connected with a first normally-open auxiliary contact of a PT cabinet handcart, a second normally-open auxiliary contact of the PT cabinet handcart is electrically connected with the first end of the coil of a fourth alternating current contactor, and the second end of the coil of the fourth alternating current contactor is electrically connected with a second power supply end of the contactor control module;

the first power end of the contactor control module is also electrically connected with a first normally-open auxiliary contact of the outgoing line cabinet handcart, the first ends of the coils of the second alternating current contactor and the fifth alternating current contactor are electrically connected with a second normally-open auxiliary contact of the outgoing line cabinet handcart, and the second ends of the coils of the second alternating current contactor and the fifth alternating current contactor are electrically connected with the second power end of the contactor control module;

the first power end of contactor control module still is connected with the first normally open auxiliary contact electricity of contact cabinet handcart, the second normally open auxiliary contact of contact cabinet handcart is connected with the first normally open auxiliary contact electricity of isolation cabinet handcart, the first end of third ac contactor's coil and the first end of sixth ac contactor's coil all are connected with the second normally open auxiliary contact electricity of isolation cabinet handcart, the second end of third ac contactor's coil and the second end of sixth ac contactor's coil all are connected with contactor control module's second power end electricity.

Further, the voltage unit comprises a first transformer T1 and at least one cabinet supply voltage module, and the cabinet supply voltage modules correspond to the contactor control modules one to one; the cabinet power supply voltage module is provided with three phase line input ends and a zero line input end;

three input of first transformer T1 is connected with miniature circuit breaker's three phase line output electricity respectively, three output of first transformer T1 is connected with the three phase line input electricity of each rack supply voltage module respectively, the zero line port of first transformer T1 is connected with miniature circuit breaker's zero line output electricity, the zero line input of rack supply voltage module is connected with first transformer T1's zero line port electricity.

Furthermore, the cabinet power supply voltage module comprises a contact system of a first alternating current contactor, a contact system of a second alternating current contactor, a contact system of a third alternating current contactor and a contact system of a fourth alternating current contactor, wherein three phase line input contacts of the first alternating current contactor, the second alternating current contactor and the third alternating current contactor are respectively and electrically connected with three phase line input ends of the cabinet power supply voltage module; three phase line input contacts and one zero line input contact of the fourth alternating current contactor are electrically connected with three phase line input ends and one zero line input end of the cabinet power supply voltage module;

the three phase line input of rack supply voltage module is connected with the high-voltage live display electricity of inlet wire cabinet, the three phase line output contact of first ac contactor is connected with the high-voltage live display electricity of PT cabinet, the three phase line output contact of second ac contactor is connected with the high-voltage live display electricity of outlet wire cabinet, the three phase line output contact of third ac contactor is connected with the high-voltage live display electricity of contact cabinet and isolation cabinet respectively, the three phase line output contact and the zero line output contact of fourth ac contactor are connected with inlet wire cabinet, PT cabinet, outlet wire cabinet, the little busbar electricity that contact cabinet and isolation cabinet correspond respectively.

Further, the current unit comprises a second transformer T2 and a cabinet supply current module; three input ends of the second transformer T2 are respectively and electrically connected with three phase line output ends of the miniature circuit breaker, a zero line port of the second transformer T2 is electrically connected with a zero line output end of the miniature circuit breaker, and the second transformer T2 is used for supplying power to the cabinet power supply current module;

the cabinet power supply current module comprises three current transformers, three current limiting resistors, a contact system of each fifth alternating current contactor and a contact system of each sixth alternating current contactor; the number of output windings of each current transformer corresponds to that of a 10kV power distribution system one by one, a first end of an input winding of each current transformer is electrically connected with an output end of a second transformer T2, and a second end of the input winding of each current transformer is electrically connected with a zero line port of a second transformer T2 through a current-limiting resistor;

respectively connecting the measuring instrument, the measuring instrument and the protective instrument in the incoming line cabinet, the outgoing line cabinet and the contact cabinet in series, and respectively forming three instrument current input ends and three instrument current output ends in the incoming line cabinet, the outgoing line cabinet and the contact cabinet; the first ends of the output windings of the three current transformers are respectively and electrically connected with the current input ends of the three instruments of the corresponding inlet wire cabinet, and the second ends of the output windings of the three current transformers are electrically connected with the three phase line output contacts of the corresponding fifth alternating current contactor and the three phase line output contacts of the corresponding sixth alternating current contactor; the three instrument current output ends of the incoming line cabinet are respectively and electrically connected with the three instrument current input ends of the outgoing line cabinet, and the three instrument current output ends of the outgoing line cabinet are respectively and electrically connected with the three phase line input contacts of the fifth alternating current contactor; and the three instrument current output ends of the inlet wire cabinet are also respectively and electrically connected with the three instrument current input ends of the interconnection cabinet, and the three instrument current output ends of the interconnection cabinet are respectively and electrically connected with the three phase line input contacts of the sixth alternating current contactor.

Furthermore, a clamping structure for branching and fixing wires is arranged at the bottom side in the control box, and a detection structure for monitoring temperature and humidity is connected to the inner wall of the control box in a clamping manner; the clamping structure comprises a rotating seat, a support, a fixing piece, a pushing block, a transverse rod, a spring and a rotating piece, wherein the bottom of the rotating seat is fixedly fastened with a control box through a bolt, the top side of the rotating seat is rotatably connected with the support, the left side of the top of the support is fixedly connected with the fixing piece, the right side of the top of the support is penetrated and slid to form the pushing block, the bottom side of the left part of the pushing block is connected with the transverse rod, the spring is wrapped on the right side of the outer surface of the transverse rod, the right end part of the spring is fixed with the pushing block, the left end part of the transverse rod is rotatably connected with the rotating piece, and the bottom side of the rear part of the rotating piece is rotatably connected with the support.

Furthermore, the detection structure comprises a barrel sleeve, a sliding groove, a protective cover, a temperature and humidity sensor, a lower clamping block, a rotating bolt and an adjusting clamping piece, wherein the sliding groove is formed in the middle of the front part of the barrel sleeve, the protective cover is connected to the inner side of the sliding groove, the temperature and humidity sensor is embedded in the inner side of the protective cover, and a wireless transmission module for transmitting detection signals of the temperature and humidity sensor is further arranged on the inner side of the protective cover; the inner side of the protective cover is provided with a sliding block, and the sliding block is inserted into the inner side of the sliding groove and is in sliding connection with the sliding groove; the bottom side of the rear part of the barrel sleeve is fixedly provided with a lower clamping block, the front side of the top of the barrel sleeve is in threaded connection with a rotating bolt, the bottom side of the rotating bolt is connected with an adjusting clamping piece, and the inner sides of the lower clamping block and the adjusting clamping piece are clamped on the control box.

Furthermore, the adjusting clamping piece comprises a rotary column, a rack, a half gear, a rotary disc and an upper clamping block, the top side of the rotary column is fixed with the rotary bolt, the bottom side of the rotary column is rotatably connected with the rack, the right side of the half gear is slidably connected with the sleeve, the left side of the rack is meshed with the half gear, the inner side of the half gear is fixed with the rotary disc, the rotary disc is rotatably connected to the inner side of the sleeve, the left side of the rear portion of the rotary disc is connected with the upper clamping block, and the upper clamping block penetrates through the inner side of the sleeve and is slidably connected with the inner side of the sleeve.

Further, the protective structure for preventing the misoperation of contacting the operation panel is additionally arranged above the box door of the incoming line cabinet, the protective structure comprises a frame seat, a small door, a rectangular seat, a push rod, a supporting block, a compression spring, a connecting rod and a clamping rod, the frame seat is embedded in the front side of the box door of the outgoing line cabinet, the outer side of the operation panel on the box door of the outgoing line cabinet is wrapped, the front part of the frame seat is hinged with the small door, the right side of the bottom of the frame seat is fixedly provided with the rectangular seat, the inner side of the rectangular seat is slidably connected with the push rod, the push rod penetrates through the inner side of the supporting block and is slidably connected with the inner side of the supporting block, the rear side of the supporting block is fixed with the rectangular seat, the left end part of the push rod is elastically abutted against the rectangular seat through the compression spring, the left side of the rear part of the push rod is rotatably connected with the clamping rod through the connecting rod, and the top side of the rectangular seat and is fastened with the small door.

According to the invention, the voltage unit and the current unit are added to provide secondary voltage and secondary current required by analog detection of primary voltage and primary current for the 10kV power distribution system, the control unit is electrically connected with normally-open auxiliary contacts of all functional cabinet hand carts in the 10kV power distribution system, and the control unit controls the output of the voltage unit and the cabinet power supply current module through the position state of the hand carts, so that a scene for operating the 10kV power distribution system is simulated under the condition that a primary side is not connected with 10kV high voltage, the authenticity of practical operation and examination is greatly increased, the modification step is simple, and the energy-saving performance is good.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural diagram of a 10kV power distribution system in the prior art.

Fig. 2 is a flow chart of a preferred embodiment of the method of retrofitting a 10kV power distribution system to a high voltage electrician practice test system of the present invention.

Fig. 3 is a structural block diagram of the modified high-voltage electrician practice test system.

Fig. 4 is a circuit diagram of the control unit.

Fig. 5 is a circuit diagram of a voltage unit.

Fig. 6 is a circuit diagram of a current cell.

Fig. 7 is a schematic structural diagram of the control box.

Fig. 8 is a schematic structural view of the clamping structure.

Fig. 9 is a schematic structural diagram of a detection structure.

Fig. 10 is a schematic structural view of the adjustment fastener.

Fig. 11 is a schematic structural view of the protective structure.

Fig. 12 is an enlarged view of a portion of a structure in fig. 11.

Fig. 13 is a schematic diagram of the power supply connection of the cabinet supply voltage module.

In the figure: 1. the device comprises a voltage unit, a current unit, a control unit, a cabinet power supply voltage module, a cabinet power supply current module, a cabinet power supply module, a control module, a cabinet power supply module, a control, 1231. and a slider.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

As shown in fig. 2, a preferred embodiment of the method of the present invention for retrofitting a 10kV power distribution system into a high voltage electrician practice test system comprises the steps of:

and step S1, providing a control box 100, wherein the control box 100 is used for providing the secondary voltage and the secondary current required by analog detection of the primary voltage and the primary current for the 10kV power distribution system.

The 10kV power distribution system can adopt KYN28-12 series equipment of Chongqing Zhongheng appliances, and comprises an incoming line cabinet 200, a PT cabinet 300, an outgoing line cabinet 400, a contact cabinet 500 and an isolation cabinet 600. It should be noted that the present invention is not limited to refitting one set of 10kV power distribution system, and may also refit more than two sets of 10kV power distribution systems at the same time, and in this embodiment, refitting two sets of 10kV power distribution systems of a 1-way 10kV power distribution system and a 2-way 10kV power distribution system is taken as an example for description.

The incoming cabinet 200 is provided with an incoming cabinet handcart, the incoming cabinet handcart is provided with an incoming cabinet vacuum circuit breaker, and the incoming cabinet 200 is also provided with a high-voltage electrified display, a multifunctional meter (measuring instrument), a watt-hour meter (measuring instrument) and a microcomputer protection device (protection instrument); the PT cabinet 300 is provided with a PT cabinet handcart, and the PT cabinet 300 is further provided with a high-voltage electrified display and a multifunctional meter; the outgoing line cabinet 400 is provided with an outgoing line cabinet handcart, the outgoing line cabinet handcart is provided with an outgoing line cabinet vacuum circuit breaker, and the outgoing line cabinet 400 is further provided with a high-voltage electrified display, a multifunctional meter, an electric meter and a microcomputer protection device; the contact cabinet 500 is provided with a contact cabinet handcart, the contact cabinet handcart is provided with a contact cabinet vacuum circuit breaker, and the contact cabinet 500 is also provided with a high-voltage electrified display, a multifunctional meter and a microcomputer protection device; isolation cabinet 600 is equipped with the isolation cabinet handcart, isolation cabinet 600 still is equipped with the high-voltage live display. Wherein, the high-voltage charged display is preferably DXN8D-7.2-40.5/Q7H nuclear phase pore electric display, the multifunctional watch is preferably JH4E-9SY, the microcomputer protection device is preferably SINCOTEC S3110L, and the watt-hour meter is preferably 3 x 220/380V watt-hour meter. For convenience of description, the incoming line cabinet 200, the PT cabinet 300, the outgoing line cabinet 400, the contact cabinet 500 and the isolation cabinet 600 of the 1-path 10kV power distribution system are hereinafter referred to as the 1-path incoming line cabinet 200, the 1-path PT cabinet 300, the 1-path outgoing line cabinet 400, the 1-path contact cabinet 500 and the 1-path isolation cabinet 600, and the incoming line cabinet 200, the PT cabinet 300, the outgoing line cabinet 400, the contact cabinet 500 and the isolation cabinet 600 of the 2-path 10kV power distribution system are hereinafter referred to as the 2-path incoming line cabinet 200, the 2-path PT cabinet 300, the 2-path outgoing line cabinet 400, the 2-path contact cabinet 500 and the 2-path isolation cabinet 600.

As shown in fig. 3, the control box 100 is preferably provided therein with a micro breaker QF10, a voltage unit 1, a current unit 2, a control unit 3, and a ground bar. The miniature circuit breaker QF10 is a three-phase four-wire circuit breaker, preferably a 32/4P circuit breaker. Four input ends of the miniature circuit breaker QF10 are respectively and electrically connected with a zero line and three phase lines of external 380V power supply voltage, and a protective ground wire of the miniature circuit breaker QF10 and a protective ground wire of the external 380V power supply voltage are both electrically connected with a grounding bar of the power distribution cabinet.

Four output ends of the miniature circuit breaker QF10 are electrically connected with a voltage unit 1 and are used for providing three-phase 380V voltage for the voltage unit 1, and the voltage unit 1 is used for providing secondary voltage (normally 100V voltage) required by voltage detection for a measuring instrument, a protection instrument and the like of a 10kV power distribution system; the four output ends of the miniature circuit breaker QF10 are also electrically connected with a current unit 2 and used for providing three-phase 380V voltage for the current unit 2, and the current unit 2 is used for providing secondary current (normally 5A current) required by current detection for a measuring instrument, a protection instrument and the like of a 10kV power distribution system; the zero line output end and one phase line output end of the miniature circuit breaker QF10 are electrically connected with the control unit 3 and used for providing single-phase 220V power supply voltage for the control unit 3, and the control unit 3 is used for controlling the on-off of the secondary voltage and the secondary current loop of each cabinet body in the 10kV power distribution system according to the operation condition of an assessment worker, so that the real secondary voltage and the real secondary current loop can be simulated.

As shown in fig. 4, the control unit 3 preferably includes two contactor control modules (31, 32), wherein first power ends of the two contactor control modules (31, 32) are electrically connected to each other and then electrically connected to a phase line output end of the miniature circuit breaker QF10 through a fuse, and second power ends of the two contactor control modules (31, 32) are electrically connected to each other and then electrically connected to a neutral line output end of the miniature circuit breaker QF10 through a fuse. The contactor control module 31 is used for controlling the power supply of the voltage unit 1 to the 1-path 10kV power distribution system, and the contactor control module 32 is used for controlling the power supply of the voltage unit 1 to the 2-path 10kV power distribution system.

The two contactor control modules (31, 32) have the same configuration, and the contactor control module 31 will be described as an example. The contactor control module 31 comprises a coil of an alternating current contactor KM1, a coil of an alternating current contactor KM2, a coil of an alternating current contactor KM3, a coil of an alternating current contactor KM4, a coil of an alternating current contactor KM5 and a coil of an alternating current contactor KM 6; the alternating current contactor KM1, the alternating current contactor KM2, the alternating current contactor KM3, the alternating current contactor KM5 and the alternating current contactor KM6 are three-phase alternating current contactors, preferably three-phase four-wire alternating current contactors; the alternating current contactor KM4 is a three-phase four-wire alternating current contactor.

As shown in fig. 5, the voltage unit 1 includes a transformer T1 and two cabinet supply voltage modules (11, 12), the transformer T1 is a 380V/100V three-phase transformer; the cabinet power supply voltage module (11, 12) is provided with three phase line input ends and a zero line input end.

Three input ends of the transformer T1 are respectively and electrically connected with three phase line output ends of the miniature circuit breaker QF10 through fuses, three output ends of the transformer T1 are respectively and electrically connected with three phase line input ends of the cabinet power supply voltage module 11 and the cabinet power supply voltage module 12 through fuses, a zero line port of the transformer T1 is electrically connected with a zero line output end of the miniature circuit breaker QF10, and zero line input ends of the cabinet power supply voltage module 11 and the cabinet power supply voltage module 12 are electrically connected with a zero line port of the transformer T1; the output end of the cabinet power supply voltage module 11 is electrically connected with the contactor control module 31, and the output end of the cabinet power supply voltage module 12 is electrically connected with the contactor control module 32.

The structures of the cabinet power supply voltage module 11 and the cabinet power supply voltage module 12 are completely the same, and the structure of the cabinet power supply voltage module 11 is described below as an example. The cabinet power supply voltage module 11 comprises a contact system of an alternating current contactor KM1, a contact system of an alternating current contactor KM2, a contact system of an alternating current contactor KM3 and a contact system of an alternating current contactor KM4, wherein three phase line input contacts of the alternating current contactor KM1, the alternating current contactor KM2 and the alternating current contactor KM3 are respectively and electrically connected with three phase line input ends of the cabinet power supply voltage module 31; the three phase line input contacts and the zero line input contact of the alternating current contactor KM4 are electrically connected with the three phase line input ends and the zero line input end of the cabinet power supply voltage module 31.

As shown in fig. 6, the current unit 2 includes a second transformer T2 and a cabinet supply current module 21, the transformer T2 is a 380V/36V three-phase transformer; the three input ends of the transformer T2 are respectively electrically connected with three phase line output ends of the miniature circuit breaker QF10 through fuses, a zero line port of the transformer T2 is electrically connected with a zero line output end of the miniature circuit breaker QF10, and three output ends of the transformer T2 are used for supplying power to the cabinet power supply current module 21.

The cabinet power supply current module 21 comprises a current transformer 1TA, a current transformer 2TA, a current transformer 3TA, a current limiting resistor R1, a current limiting resistor R2, a current limiting resistor R3, a contact system of an alternating current contactor KM5, a contact system of an alternating current contactor KM6, a contact system of an alternating current contactor KM11 and a contact system of an alternating current contactor KM 12; the secondary windings of the current transformer 1TA, the current transformer 2TA and the current transformer 3TA are used as input windings of the current transformer, the primary winding is used as an output winding of the current transformer, the number of turns of the input winding of the current transformer is more than that of the output winding, so that a large current can be output at the output winding by inputting a small current at the input winding, the electric energy consumption can be greatly reduced, and the energy-saving effect is achieved.

The first ends of the input windings of the current transformer 1TA, the current transformer 2TA and the current transformer 3TA are electrically connected with three output ends of a transformer T2 in a one-to-one correspondence mode through fuses, and the second ends of the input windings of the current transformer 1TA, the current transformer 2TA and the current transformer 3TA are electrically connected with a zero line port of the transformer T2 through a current limiting resistor R1, a current limiting resistor R2 and a current limiting resistor R3 respectively. The current transformer 1TA, the current transformer 2TA and the current transformer 3TA are respectively provided with two output windings.

As shown in fig. 7, 8, 9 and 10, in order to facilitate wire distribution and wire fixation and detect temperature and humidity in the control box 100, a clamping structure 110 for wire distribution and wire fixation may be further disposed at a bottom side of the interior of the control box 100, and a detection structure 120 for monitoring temperature and humidity is snap-connected to an inner wall of the control box 100, the clamping structure 110 includes a rotating base 111, a support base 112, a fixing plate 113, a pushing block 114, a cross bar 115, a spring 116 and a rotating plate 117, the bottom of the rotating base 111 is fixed to the control box 100 by a bolt, so as to support and fix, the top of the rotating base 111 is rotatably connected to the support base 112, so as to facilitate rotation of the support base 112, the fixing plate 113 is fixedly connected to a left side of the top of the support base 112, the pushing block 114 slides through the right side of the top of the support base 112, the cross bar 115 is connected to a left bottom side of the pushing block 114, so as to facilitate movement of the cross bar 115, the spring 116 is wrapped on a right side of an outer surface of the cross bar 115, the right end part of the spring 116 is fixed with the push block 114 to play a role of resetting, the left end part of the cross rod 115 is rotatably connected with the rotating sheet 117, the bottom side of the rear part of the rotating sheet 117 is rotatably connected with the support 112, and the wires are clamped and classified through the matching of the fixed sheet 113 and the rotating sheet 117.

The detection structure 120 comprises a barrel sleeve 121, a sliding groove 122, a protective cover 123, a temperature and humidity sensor 124, a lower fixture block 125, a rotating bolt 126 and an adjusting fastener 127, the sliding groove 122 is formed in the middle of the front portion of the barrel sleeve 121, the protective cover 123 is connected to the inner side of the sliding groove 122, the temperature and humidity sensor 124 is embedded in the protective cover 123, the temperature and humidity sensor 124 is protected by the protective cover 123, the lower fixture block 125 is fixed to the bottom side of the rear portion of the barrel sleeve 121, the rotating bolt 126 is connected to the front side of the top portion of the barrel sleeve 121 in a threaded manner, the bottom side of the rotating bolt 126 is connected with the adjusting fastener 127, the lower fixture block 125 and the inner side of the adjusting fastener 127 are clamped on the control box 100 to achieve the effect of convenient installation, a wireless transmission module for transmitting the detection signals of the temperature and humidity sensor 124 is arranged in the inner side of the protective cover 123 to facilitate connection with external equipment, the real-time monitoring of the detection information, a sliding block 1231 is arranged in the inner side of the protective cover 123, the adjusting clamping piece 127 comprises a rotating column 1271, a rack 1272, a half gear 1273, a rotary disc 1274 and an upper clamping block 1275, wherein the top side of the rotating column 1271 is fixed with the rotating bolt 126, the bottom side of the rotating column 1271 is rotatably connected with the rack 1272, the right side of the half gear 1273 is slidably connected with the barrel casing 121, the left side of the rack 1272 is meshed with the half gear 1273 so as to drive the half gear 1273 to rotate, the inner side of the half gear 1273 is fixed with the rotary disc 1274, the rotary disc 1274 is rotatably connected with the inner side of the barrel casing 121 to play a role in supporting and rotating, the left side of the rear part of the rotary disc 1274 is connected with the upper clamping block 1275 so as to drive the upper clamping block 1275 to be matched with the lower clamping block 125 to carry out rapid clamping and fixing, the upper clamping block 1275 penetrates through the inner side of the barrel casing to be slidably connected with the barrel casing to play a role in limiting movement of the 121, the lower fixture block 125 and the upper fixture block 1275 are made of insulating materials, so that the use safety is improved.

And S2, removing fuses on the secondary sides of the voltage transformers in each incoming line cabinet 200, short-circuiting the secondary terminals of the current transformer body, disconnecting and insulating the wires connecting the secondary sides of the voltage transformers and the current transformers with the terminal rows, and avoiding the secondary voltage and the secondary current from generating 10kV high voltage and heavy current on a 10kV bus through the voltage transformers and the current transformers.

As shown in fig. 11 and 12, in order to prevent the misoperation of the personnel in the non-examination time, a protective structure for preventing the misoperation of the personnel in the non-examination time can be further arranged above the door of the wire inlet cabinet 200, the protective structure comprises a frame seat 211, a small door 212, a rectangular seat 213, a push rod 214, a supporting block 215, a compression spring 216, a connecting rod 217 and a clamping rod 218, the frame seat 211 is embedded in the front side of the door of the wire inlet cabinet 200 and wraps the outer side of the operating panel on the door of the wire inlet cabinet 200, the front part of the frame seat 211 is hinged with the small door 212, the right side of the bottom of the frame seat 211 is fixed with the rectangular seat 213, the inner side of the rectangular seat 213 is slidably connected with the push rod 214, the push rod 214 penetrates through the inner side of the supporting block 215 and is slidably connected with the supporting block 215 to play a role of supporting movement, the rear side of the supporting block 215 is fixed with the rectangular seat 213, the left end part of the push rod 214 is elastically abutted against the rectangular seat 213 through the compression spring 216 to play a role of resetting, the left side of the push rod 214 is rotatably connected with the clamping rod 218 through the connecting rod 217, the card rod 218 is convenient to drive to move in the vertical direction, the top side of the card rod 218 penetrates through the inner sides of the rectangular seat 213 and is clamped with the small door 212, the small door 212 is limited through the matching of the card rod 218 and the small door 212, the small door 212 is of a transparent structure, the operation panel on the door of the incoming cabinet 200 is observed through the small door 212, and the small door 212 plays a role in preventing mistaken touch operation.

And S3, removing fuses on the secondary sides of the voltage transformers in the PT cabinets 300, disconnecting and insulating and binding wires connecting the secondary sides of the voltage transformers with the terminal rows, and avoiding the secondary voltage from generating 10kV high voltage on a 10kV bus through the voltage transformers.

And step S4, short-circuiting the current transformers and the secondary terminals of the zero sequence current transformer bodies in the outlet cabinets 400, and disconnecting and insulating the leads connected with the terminal rows at the secondary sides of the current transformers and the zero sequence current transformers.

And step S5, short-circuiting secondary terminals of the current transformer bodies in the contact cabinets 500, and removing and insulating and binding wires connecting the secondary sides of the current transformers with the terminal rows.

And step S6, electrically connecting the high-voltage live display, the measuring instrument, the secondary voltage loop and the secondary current loop of the measuring instrument and the protective instrument of each of the incoming line cabinet 200, the PT cabinet 300, the outgoing line cabinet 400, the connection cabinet 500 and the isolation cabinet 600 with the control box 100. The method specifically comprises the following steps:

(1) as shown in fig. 4, a first power end of the contactor control module 31 is electrically connected to a first normally-open auxiliary contact of an inlet cabinet handcart 1S19 of the 1-way inlet cabinet 200, a first end of a coil of the ac contactor KM1 is electrically connected to a second normally-open auxiliary contact of the inlet cabinet handcart 1S19, and a second end of the coil of the ac contactor KM1 is electrically connected to a second power end of the contactor control module 31; therefore, the power supply of the alternating current contactor KM1 is controlled by the inlet wire cabinet handcart 1S19 and the inlet wire cabinet vacuum circuit breaker 1QF11 on the inlet wire cabinet handcart 1S 19. The second normally-open auxiliary contact of the incoming line cabinet handcart 1S19 is also electrically connected with the first normally-open auxiliary contact of the PT cabinet handcart 1S29 of the 1-way PT cabinet 300, the second normally-open auxiliary contact of the PT cabinet handcart 1S29 is electrically connected with the first end of the coil of the alternating current contactor KM4, and the second end of the coil of the alternating current contactor KM4 is electrically connected with the second power supply end of the contactor control module 31; therefore, under the condition that the incoming line cabinet handcart 1S19 and the incoming line cabinet vacuum circuit breaker 1QF11 are closed, the power supply of the alternating current contactor KM4 is controlled through the PT cabinet handcart 1S 29. The first power end of the contactor control module 31 is also electrically connected with a first normally-open auxiliary contact of an outgoing line cabinet handcart 1S39 of the 1-path outgoing line cabinet 400, the first end of a coil of the alternating current contactor KM2 and the first end of a coil of the alternating current contactor KM5 are both electrically connected with a second normally-open auxiliary contact of the outgoing line cabinet handcart 1S39, and the second end of the coil of the alternating current contactor KM2 and the second end of the coil of the alternating current contactor KM5 are both electrically connected with a second power end of the contactor control module 31; therefore, the power supply of the alternating current contactor KM2 and the alternating current contactor KM5 is controlled by the outgoing line cabinet handcart 1S39 and the outgoing line cabinet vacuum circuit breaker 1QF31 on the outgoing line cabinet handcart 1S 39. The first power end of the contactor control module 31 is also electrically connected with a first normally-open auxiliary contact of an interconnection cabinet handcart 1S49 of the 1-way interconnection cabinet 500, a second normally-open auxiliary contact of the interconnection cabinet handcart 1S49 is electrically connected with a first normally-open auxiliary contact of an isolation cabinet handcart 1S59 of the 1-way isolation cabinet 600, a first end of a coil of the alternating current contactor KM3 and a first end of a coil of the alternating current contactor KM6 are both electrically connected with a second normally-open auxiliary contact of the isolation cabinet handcart 1S59, and a second end of a coil of the alternating current contactor KM3 and a second end of a coil of the alternating current contactor KM6 are both electrically connected with a second power end of the contactor control module 31; therefore, the power supply of the alternating current contactor KM3 and the alternating current contactor KM6 is controlled by the contact cabinet handcart 1S49, the contact cabinet vacuum circuit breaker 1QF41 on the contact cabinet handcart 1S49 and the isolation cabinet handcart 1S 59.

(2) As shown in fig. 13, three phase input terminals of the cabinet supply voltage module 31 provide three-phase 100V ac detection voltage for the high voltage live display 1DXN1 of the 1-way incoming cabinet 200, three phase output contacts of the ac contactor KM1 provide three-phase 100V ac detection voltage for the high voltage live display 1DXN2 of the 1-way PT cabinet 300, three phase output contacts of the ac contactor KM2 provide three-phase 100V ac detection voltage for the high voltage live display 1DXN3 of the 1-way outgoing cabinet 400, and three phase output contacts of the ac contactor KM3 provide three-phase 100V ac detection voltage for the high voltage live display 1DXN4 of the 1-way interconnection cabinet 500 and the high voltage live display 1DXN5 of the 1-way isolation cabinet 600. Three phase line output contacts and a zero line output contact of the alternating current contactor KM4 are respectively and electrically connected with small buses corresponding to the 1-way incoming line cabinet 200, the 1-way PT cabinet 300, the 1-way outgoing line cabinet 400, the 1-way contact cabinet 500 and the 1-way isolation cabinet 600, and are used for providing three-phase 100V alternating current voltage for the 1-way incoming line cabinet 200, the 1-way PT cabinet 300, the 1-way outgoing line cabinet 400, the 1-way contact cabinet 500 and the 1-way isolation cabinet 600; for example, three phase 100V ac voltage is provided to multifunction meter 1PM1, meter 1PJ1, microcomputer protection device 1IN1 of 1-way incoming cabinet 200, multifunction meter 1PM2 of 1-way PT cabinet 300, multifunction meter 1PM3, meter 1PJ3, microcomputer protection device 1IN3 of 1-way outgoing cabinet 400, multifunction meter 1PM4 of 1-way interconnection cabinet 500, microcomputer protection device 1IN4, and multifunction meter 1PM5 of 1-way isolation cabinet 600.

(3) As shown in fig. 6, the first output windings of the current transformer 1TA, the current transformer 2TA and the current transformer 3TA are electrically connected with the 1-way 10kV distribution system, the contact system of the ac contactor KM5 and the contact system of the ac contactor KM6, so as to form a 1-way 10kV distribution system current detection channel; the second output winding is electrically connected with a 2-path 10kV power distribution system, a contact system of an alternating current contactor KM11 and a contact system of an alternating current contactor KM12 to form a 2-path 10kV power distribution system current detection channel; the structure of the 1-path 10kV power distribution system current detection channel is the same as that of the 2-path 10kV power distribution system current detection channel, and the 1-path 10kV power distribution system current detection channel is taken as an example for description.

The measuring instruments, the measuring instruments and the protective instruments in the incoming line cabinet 200, the outgoing line cabinet 400 and the contact cabinet 500 are respectively connected in series, and three instrument current input ends and three instrument current output ends are respectively formed in the incoming line cabinet 200, the outgoing line cabinet 400 and the contact cabinet 500. First ends of first output windings of the current transformer 1TA, the current transformer 2TA and the current transformer 3TA are respectively electrically connected with three instrument current input ends of the 1-way incoming line cabinet 200, and second ends of the first output windings of the current transformer 1TA, the current transformer 2TA and the current transformer 3TA are electrically connected with three phase line output contacts of the alternating current contactor KM5 and three phase line output contacts of the alternating current contactor KM 6; three instrument current output ends of the 1-path incoming line cabinet 200 are respectively and electrically connected with three instrument current input ends of the 1-path outgoing line cabinet 400, and three instrument current output ends of the 1-path outgoing line cabinet 400 are respectively and electrically connected with three phase line input contacts of the alternating current contactor KM 5; the three instrument current output ends of the 1-way incoming line cabinet 200 are also electrically connected with the three instrument current input ends of the 1-way interconnection cabinet 500 respectively, and the three instrument current output ends of the 1-way interconnection cabinet 500 are electrically connected with the three phase line input contacts of the alternating current contactor KM6 respectively.

IN this embodiment, the current detection terminals of the multifunctional meter 1PM1, the watt-hour meter 1PJ1 and the microcomputer protection device 1IN1 of the 1-way inlet box 200 are connected IN series, three current detection input terminals of the multifunctional meter 1PM1 are used as three instrument current input terminals of the 1-way inlet box 200, and three current detection output terminals of the microcomputer protection device 1IN1 are used as three instrument current output terminals of the 1-way inlet box 200. The current detection ends of the multifunctional meter 1PM3, the watt-hour meter 1PJ3 and the microcomputer protection device 1IN3 of the 1-way outgoing line cabinet 400 are connected IN series, three current detection input ends of the multifunctional meter 1PM3 are used as three instrument current input ends of the 1-way outgoing line cabinet 400, and three current detection output ends of the microcomputer protection device 1IN3 are used as three instrument current output ends of the 1-way outgoing line cabinet 400. The multifunctional meter 1PM4 of the 1-way interconnection cabinet 500 is connected IN series with the current detection end of the microcomputer protection device 1IN4, the three current detection input ends of the multifunctional meter 1PM4 are used as the three instrument current input ends of the 1-way interconnection cabinet 500, and the three current detection output ends of the microcomputer protection device 1IN4 are used as the three instrument current output ends of the 1-way interconnection cabinet 500.

Certainly, the incoming line cabinet 200, the PT cabinet 300, the outgoing line cabinet 400, the connection cabinet 500 and the isolation cabinet 600 in this embodiment further include an energy storage motor, an indicator light circuit, a handcart room heater, a cable room heater, an illumination lamp and other devices, and a power supply unit is further provided to provide working voltage for some devices by introducing 220V voltage, and the connection of these devices is not changed, and is not described herein for the prior art.

The working principle of the high-voltage electrician practice test system modified in the embodiment is described below by taking a 1-way 10kV power distribution system as an example:

as shown in fig. 2 to 13, during power transmission check, the miniature circuit breaker QF10 is switched on, 380V three-phase ac voltage is connected, 220V ac voltage is provided for the

control unit

3, 100V three-phase ac voltage is provided for the cabinet supply voltage module 31 through the transformer T1, and 36V three-phase ac voltage is provided for the control unit 3 through the transformer T2. At this time, the cabinet supply voltage module 31 outputs 100V three-phase ac power to the 1-way inlet cabinet 200, so that the lamp of the high-voltage live display 1DXN1 is turned on.

Sequentially shaking an incoming line cabinet handcart 1S19 and a PT cabinet handcart 1S29 from an experimental position into a working position, switching on a vacuum circuit breaker 1Q11 of the incoming line cabinet handcart, and then electrifying and attracting an alternating current contactor KM1 to light a lamp of a high-voltage electrified display 1DXN 2; the alternating current contactor KM4 is electrified and closed at the same time to provide 100V three-phase alternating current voltage for the 1-way incoming line cabinet 200, the 1-way PT cabinet 300, the 1-way outgoing line cabinet 400, the 1-way contact cabinet 500 and the 1-

way isolation cabinet

600, and 100V alternating current voltage is detected by each multifunctional meter, watt-hour meter and microcomputer protection device of the 1-way 10kV power distribution system through a small bus, so that 10kV voltage display is realized.

The method comprises the following steps of shaking an outgoing line cabinet handcart 1S39 into a working position from an experimental position, switching on a vacuum circuit breaker 1Q31 of the outgoing line cabinet handcart, and then electrifying and attracting an alternating current contactor KM2 to light a lamp of a high-voltage electrified display 1DXN 3; the AC contactor KM5 is electrified and attracted at the same time, so that the multifunctional meters, the kilowatt-hour meters and the microcomputer protection devices of the 1-way incoming line cabinet 200 and the 1-way outgoing line cabinet 400 display current parameters.

Sequentially shaking an isolation cabinet handcart 1S59 and a contact cabinet handcart 1S49 from an experimental position into a working position, and after a vacuum circuit breaker 1Q41 of the contact cabinet handcart is switched on, enabling an alternating current contactor KM3 to be electrified and sucked, and enabling lamps of a high-voltage electrified display 1DXN4 and a 1DXN5 to be lightened; the AC contactor KM6 is electrified and attracted at the same time, so that the multifunctional meter 1PM4 and the microcomputer protection device 1IN4 of the 1-way connection cabinet 500 display current parameters.

When power failure examination is carried out, the vacuum circuit breaker 1Q41 of the contact cabinet handcart is switched off, the contact cabinet handcart 1S49 and the isolation cabinet handcart 1S59 are sequentially shaken out to a test position, the alternating current contactor KM3 is powered off and disconnected, and the lamps of the high-voltage electrified display 1DXN4 and 1DXN5 are turned off; the alternating current contactor KM6 is powered off at the same time, so that the multifunctional meter 1PM4 and the microcomputer protection device 1IN4 of the 1-way connection cabinet 500 have no current display, and when the outgoing cabinet 400 is not switched on, the instrument and the microcomputer protection of the incoming cabinet 200 also have no current display.

The vacuum circuit breaker 1Q31 of the outgoing line cabinet handcart is switched off, the outgoing line cabinet handcart 1S39 is shaken out to a test position, the alternating current contactor KM2 is powered off and disconnected, the lamp of the high-voltage electrified display 1DXN3 is turned off, the alternating current contactor KM5 is powered off and disconnected at the same time, and the multifunctional meter, the watt-hour meter and the microcomputer protection device of the 1-path incoming line cabinet 200 and the 1-path outgoing line cabinet 400 are enabled to have no current display.

The vacuum circuit breaker 1Q11 of the inlet cabinet handcart is switched off, the inlet cabinet handcart 1S19 and the PT cabinet handcart 1S29 are sequentially shaken out to a test position, the alternating current contactor KM1 is powered off and disconnected, and the lamp of the high-voltage electrified display 1DXN2 is turned off; the alternating current contactor KM4 is disconnected when losing power, and all the multifunctional meters, the kilowatt-hour meters and the microcomputer protection devices of the 1-way 10kV power distribution system have no voltage display.

The power supply of the micro breaker QF10 is cut off and 380V is cut off, and the lamp of the high-voltage live display 1DXN1 is extinguished.

According to the process, after the handcart of each functional cabinet is operated, the instrument display condition of each functional cabinet is the same as the actual condition, so that the scene of power distribution operation of a 10kV power distribution system is simulated under the condition that the primary side is not connected with 10kV high voltage, and the authenticity of actual operation and examination is greatly increased. Because the highest voltage of the function cabinet is only 220V, which is equivalent to that of a common electric appliance, the potential safety hazard of high-voltage electric shock caused by misoperation in the real operation examination process can be avoided, and the safety of the real operation examination is ensured. The refitting operation is simple, and the energy-saving performance is good.

In addition, when the device installation was wired, the user can be in the same place the wiring classification of same device or same wiring end, then promote ejector pad 114 and make horizontal pole 115 drive and turn piece 117 outwards expand, the wiring of device inserts stationary blade 113 and turn piece 117 inboard after will classifying, then loosen ejector pad 114, make horizontal pole 115 reset under spring 116's effect, thereby make the wiring by the centre gripping at stationary blade 113 and turn piece 117 inboard, it is categorised to carry out the centre gripping to the wiring, can find out corresponding wiring fast when overhauing, the support can rotate angular position on rotating seat 111 simultaneously, be convenient for placing of wiring.

The bottom side of the interior of the control box 100 is provided with the detection structure 120, a user can rotate the rotating bolt 126 to enable the rack 1272 to drive the half gear 1273 to rotate, the half gear 1273 enables the upper clamping block 1275 to rotate through the turntable 1274, the upper clamping block 1275 rotates to be matched with the lower clamping block 125 to be clamped and fixed at a position needing to be installed in the control box 100 quickly, then the protection cover 123 is enabled to drive the temperature and humidity sensor 124 to turn through the sliding block 1231 moving in the sliding groove 122, so that the temperature and humidity sensor 124 is aligned with important devices to be monitored, the monitoring precision is high, meanwhile, the inner side of the protection cover 123 is provided with a wireless transmission module used for transmitting detection signals of the temperature and humidity sensor 124, the wireless transmission module can be connected with external equipment, and information detected by the temperature and humidity sensor 124 is monitored in real time.

The little door 212 of transparence installs operating panel's on inlet wire cabinet 200 chamber door the outside, play the effect of preventing the mistake and touching the operation when being convenient for observe, when operating panel on inlet wire cabinet 200 chamber door needs to be operated, the user can promote push rod 214, push rod 214 removes and makes connecting rod 217 drive kelly 218 move down, thereby kelly 218 breaks away from the block with the little door 212 of transparence, with the little door 212 of transparence from the inboard pull-out of frame 211, thereby the user can operate operating panel on inlet wire cabinet 200 chamber door, the little door 212 of transparence is installed in the outside of operating panel on inlet wire cabinet 200 chamber door, play the effect of preventing the mistake and touching the operation when being convenient for observe. After the operation is finished, the user pushes the wicket 212 into the frame seat 211 again, and the clamping rod 218 is inserted into the bottom side of the wicket 212 to limit the position under the action of the compression spring 216, so as to prevent the wicket 212 from being displaced.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims

1. A method for modifying a 10kV power distribution system into a high-voltage electrician practical operation examination system is disclosed, wherein the 10kV power distribution system comprises an incoming line cabinet, a PT cabinet, an outgoing line cabinet, a connection cabinet and an isolation cabinet, and is characterized by comprising the following steps:

2. The method for transforming a 10kV power distribution system into a high-voltage electrician practice test system according to claim 1, wherein a miniature circuit breaker, a voltage unit, a current unit and a control unit are arranged in the control box, the input ends of the miniature circuit breaker are respectively used for connecting an external 380V power supply voltage, the output ends of the miniature circuit breaker are respectively electrically connected with the voltage unit, the current unit and the control unit, the voltage unit is used for providing a secondary voltage required for voltage detection for the 10kV power distribution system, and the current unit is used for providing a secondary current required for current detection for the 10kV power distribution system; and the control unit is used for controlling the on-off of the secondary voltage and the secondary current loop of each cabinet body in the 10kV power distribution system.

3. The method for transforming a 10kV power distribution system into a high-voltage electrician practice test system according to claim 2, wherein the control unit comprises at least one contactor control module, the contactor control modules correspond to the 10kV power distribution system one by one, a first power end of the contactor control module is electrically connected with one phase output end of the micro circuit breaker, and a second power end of the contactor control module is electrically connected with a zero line output end of the micro circuit breaker;

4. The method for retrofitting a 10kV power distribution system into a high-voltage electrician practice test system according to claim 3, wherein the voltage unit comprises a first transformer T1 and at least one cabinet supply voltage module, the cabinet supply voltage modules corresponding to the contactor control modules one-to-one; the cabinet power supply voltage module is provided with three phase line input ends and a zero line input end;

5. The method of retrofitting a 10kV power distribution system into a high-voltage electrician practice test system according to claim 4, wherein the cabinet supply voltage module comprises a contact system of a first ac contactor, a contact system of a second ac contactor, a contact system of a third ac contactor, and a contact system of a fourth ac contactor, wherein three phase line input contacts of the first ac contactor, the second ac contactor, and the third ac contactor are electrically connected with three phase line input terminals of the cabinet supply voltage module, respectively; three phase line input contacts and one zero line input contact of the fourth alternating current contactor are electrically connected with three phase line input ends and one zero line input end of the cabinet power supply voltage module;

6. The method for retrofitting a 10kV power distribution system into a high voltage electrician practice test system according to claim 4, wherein the current unit comprises a second transformer T2 and a cabinet supply current module; three input ends of the second transformer T2 are respectively and electrically connected with three phase line output ends of the miniature circuit breaker, a zero line port of the second transformer T2 is electrically connected with a zero line output end of the miniature circuit breaker, and the second transformer T2 is used for supplying power to the cabinet power supply current module;

7. The method for refitting the 10kV power distribution system into the high-voltage electrician practice test system according to claim 1, wherein a clamping structure for separating and fixing wires is arranged on the bottom side inside the control box, and a detection structure for monitoring temperature and humidity is connected to the inner wall of the control box in a clamping manner; the clamping structure comprises a rotating seat, a support, a fixing piece, a pushing block, a transverse rod, a spring and a rotating piece, wherein the bottom of the rotating seat is fixedly fastened with a control box through a bolt, the top side of the rotating seat is rotatably connected with the support, the left side of the top of the support is fixedly connected with the fixing piece, the right side of the top of the support is penetrated and slid to form the pushing block, the bottom side of the left part of the pushing block is connected with the transverse rod, the spring is wrapped on the right side of the outer surface of the transverse rod, the right end part of the spring is fixed with the pushing block, the left end part of the transverse rod is rotatably connected with the rotating piece, and the bottom side of the rear part of the rotating piece is rotatably connected with the support.

8. The method for modifying a 10kV power distribution system into a high-voltage electrician practice test system according to claim 7, wherein the detection structure comprises a barrel sleeve, a sliding groove, a protective cover, a temperature and humidity sensor, a lower clamping block, a rotating bolt and an adjusting clamping piece, the sliding groove is formed in the middle of the front portion of the barrel sleeve, the protective cover is connected to the inner side of the sliding groove, the temperature and humidity sensor is embedded in the protective cover, and a wireless transmission module for transmitting detection signals of the temperature and humidity sensor is further arranged on the inner side of the protective cover; the inner side of the protective cover is provided with a sliding block, and the sliding block is inserted into the inner side of the sliding groove and is in sliding connection with the sliding groove; the bottom side of the rear part of the barrel sleeve is fixedly provided with a lower clamping block, the front side of the top of the barrel sleeve is in threaded connection with a rotating bolt, the bottom side of the rotating bolt is connected with an adjusting clamping piece, and the inner sides of the lower clamping block and the adjusting clamping piece are clamped on the control box.

9. The method of claim 8, wherein the adjustment fastener comprises a rotary post, a rack, a half gear, a rotary disk and an upper fixture block, the top side of the rotary post is fixed to the rotary bolt, the bottom side of the rotary post is rotatably connected to the rack, the right side of the half gear is slidably connected to the sleeve, the left side of the rack is engaged with the half gear, the inner side of the half gear is fixed to the rotary disk, the rotary disk is rotatably connected to the inner side of the sleeve, the left side of the rear portion of the rotary disk is connected to the upper fixture block, and the upper fixture block penetrates through the inner side of the sleeve and is slidably connected to the inner side of the sleeve.

10. The method for transforming a 10kV power distribution system into a high-voltage electrician practice test system according to claim 1, wherein a protective structure for preventing the operation panel from being touched by mistake is added above the door of the incoming cabinet, the protective structure comprises a frame seat, a small door, a rectangular seat, a push rod, a supporting block, a compression spring, a connecting rod and a clamping rod, the frame seat is embedded in the front side of the door of the outgoing cabinet and wraps the outer side of the operation panel on the door of the outgoing cabinet, the small door is hinged to the front part of the frame seat, the rectangular seat is fixed on the right side of the bottom of the frame seat, the push rod is connected with the inner side of the rectangular seat in a sliding manner, the push rod penetrates through the inner side of the supporting block and is connected with the rectangular seat in a sliding manner, the rear side of the supporting block is fixed with the rectangular seat, the left end part of the push rod is elastically abutted against the rectangular seat through the compression spring, and the left side of the rear part of the push rod is rotatably connected with the clamping rod through the connecting rod, the top side of the clamping rod penetrates through the rectangular seat and the inner side of the rectangular seat and is clamped with the small door.