CN115420981B - Alternating current power grid relay protection sensitivity determination method and device - Google Patents

Abstract

The application discloses an alternating current power grid relay protection sensitivity determining device which comprises a base and a shield positioned on the outer side of the base, wherein an installation box and a control box positioned opposite to the installation box are arranged on the top of the base; a rheostat which is arranged between the mounting box and the control box and can flexibly configure the resistance value. According to the application, the positions of the supporting components are adjusted through the matching of the guide rails and the supporting components, the varistor with flexibly configured resistance values is supported by the supporting components, the varistor is fixed through the binding bands, the wires wound on the winding frame are discharged through the matching of the driving components and the winding frame, the varistor, the relay protection device and the detector are electrically connected through the wires, the number of turns of the resistor wire connected into the circuit is changed through the matching of the control components and the adjusting screw rod, so that the voltage can be changed, the response of the relay protection device under multiple groups of different voltages is detected, the detection of the sensitivity of the relay protection device is realized, and the device is simple to operate, flexible to use and wide in applicability.

Description

A method and device for determining the sensitivity of AC power grid relay protection

Technical field

The invention relates to the field of electric power, and in particular to a method and device for determining sensitivity of AC power grid relay protection.

Background technique

At present, commonly used relay protection devices include relays and other electrical devices. The function of relay protection is to quickly determine the fault and isolate the fault point. Therefore, the key point of implementing relay protection is to quickly find the fault characteristics and isolate them. To judge, current, voltage, impedance, zero sequence, negative sequence, power direction, etc. are usually used to realize the protection principle by using changes in normal operating conditions and fault conditions.

Therefore, the sensitivity of the relay protection device needs to be maintained within a reasonable range to ensure the normal use of the AC power grid. Therefore, detecting the sensitivity of the relay protection device triggering is an important indicator of whether the relay protection device can function normally. For this reason, it is necessary for us to propose a method and device for determining the sensitivity of AC power grid relay protection to solve the above problems.

Contents of the invention

The purpose of the present invention is to provide a method and device for determining the sensitivity of AC power grid relay protection. Through the cooperation of the guide rail and the support component, the position of the support component is adjusted. The support component supports a varistor that can flexibly configure the resistance value. By binding The rheostat is fixed with a belt, and through the cooperation between the driving component and the winding frame, the wires wound on the winding frame are released, and the wires are used to electrically connect the rheostat, the relay protection device and the detector, and through the control assembly and the adjusting screw Cooperate with it, change the number of turns of the resistance wire connected to the circuit, and then change the voltage, detect the reaction of the relay protection device under multiple sets of different voltages, and realize the detection of the sensitivity of the relay protection device to solve the above shortcomings.

In order to achieve the above object, the present invention provides the following technical solution: an AC power grid relay protection sensitivity determination device, including a base and a shield located outside the base. A mounting box is installed on the top of the base and a mounting box is located opposite the mounting box. A control box with a touch screen embedded on the front panel of the control box. The control box is divided into an installation cavity and a storage cavity through partitions. A device electrically connected to the touch screen is installed in the installation cavity. Detector, a storage rack is slidably provided in the storage cavity;

A varistor with a flexibly configurable resistance value is provided between the installation box and the control box. The varistor includes an insulating porcelain cylinder and a resistance wire wound around the outer wall of the insulating porcelain cylinder. Threads are installed at both ends of the insulating porcelain cylinder. sleeves, the two threaded sleeves are respectively provided with a card holder and a chuck;

An adjustable support portion is provided at the bottom of the varistor. The support portion includes a guide rail, a support component slidably disposed on the guide rail, and a strap for fixing the varistor. The guide rail is fixed to the top of the base, and the The support assembly is used to support the varistor;

An adjustment part is provided on one side of the varistor. The adjustment part is used to change the resistance of the varistor. The adjustment part includes a control component, an adjustment screw, a metal rod and a sliding component slidably disposed on the outer wall of the metal rod. The metal rod has Upper terminals are installed at both ends, and the two upper terminals are respectively fixed on the outer walls of the installation box and the control box;

The winding part is provided on one side of the adjustment part. The winding part is used to organize the wires. The winding part includes a fixed frame and a moving plate provided on the top of the fixed frame. The fixed frame is fixed on the top of the base, so A plurality of winding frames distributed in a linear array are rotatably provided on the inner side of the fixed frame, and a plurality of driving assemblies for driving the winding frames distributed in a linear array are provided on the inner side of the movable plate;

A relay protection device provided on one side of the winding portion and a clamping portion for fixing the relay protection device.

As a preferred solution of the present invention, both ends of the outer wall of the insulating porcelain cylinder are covered with metal hoops for fixing resistance wires. Lower terminals are installed on the metal hoops, and the outer walls of the resistance wires are coated with Covered with insulating paint;

The card holder includes a ferrule threadedly connected to a threaded sleeve and a cartridge fixed inside the ferrule. The outer wall of the cartridge is provided with six L-shaped snap grooves distributed in an annular array. Embedded with permanent magnets;

The clamping head includes a clamping barrel and a threaded portion provided on the outer wall of one end of the clamping barrel for threaded connection with the threaded sleeve. The interior of the clamping barrel is provided with a permanent magnetic column that is magnetically attracted to the permanent magnet. The inner wall of the clamping barrel is provided with six buckling blocks distributed in an annular array around the permanent magnet column for adapting to the L-shaped buckling groove.

As a preferred solution of the present invention, a convex chute is provided at the center line of the guide rail, and two strip holes connected to the convex chute are provided at the top of the guide rail. The two strip holes are Symmetrically arranged;

The support assembly includes a sliding convex block slidably disposed in a convex chute and a T-shaped support block fixed on the top of the sliding convex block. The top of the T-shaped support block is provided with a V-shaped groove, and the V-shaped groove is There are through holes on both sides for tying straps, a positioning block is fixed at the center of the bottom of the T-shaped support block, and a threaded through hole is provided at the center of the positioning block;

The top of the sliding bump is provided with a positioning slot that matches the positioning block. The through hole on one side of the positioning slot is provided with a bolt threadedly connected to the threaded through hole for fixing the T-shaped support block, so Threaded rods are symmetrically arranged on both sides of the positioning slot. The threaded rods are located in the strip holes. The outer walls of the threaded rods are threadedly connected with fastening nuts for locking the sliding bumps. The fastening nuts are located in the strip holes. Top of guide rail.

As a preferred solution of the present invention, the control assembly includes a motor arranged inside the installation box, the output shaft of the motor is keyed to a sector gear, the top of the sector gear is engaged with a transmission gear, and the adjusting screw One end of the adjustment screw is rotatably connected to the control box through a bearing, and the other end of the adjustment screw penetrates the installation box and is fixedly connected to the transmission gear. The other end of the adjustment screw is rotationally connected to the installation box through a bearing. The outer wall is covered with a nut slide that moves horizontally along the adjusting screw, and a mounting bracket is installed on one side of the nut slide;

The sliding assembly includes a U-shaped piece slidably arranged on the outer wall of the metal rod and a figure-eight sliding piece fixed inside the U-shaped piece. The top of the U-shaped piece is fixedly connected to the bottom of the mounting bracket, and the figure-shaped sliding piece is slidably arranged on the inside of the U-shaped piece. Resistance wire outer wall.

As a preferred solution of the present invention, a set of sliding grooves distributed in a linear array are provided on both sides of the fixed frame, and a semicircular through hole connected to the sliding groove is provided at the bottom of the sliding groove, and the fixed frame There are two telescopic rods for connecting the moving plate symmetrically installed on the inside. The bottom of the moving plate is provided with two sets of limiting plates distributed in a linear array for sliding cooperation with the sliding groove. The bottom of the limiting plate The semicircular through hole is provided;

The winding frame includes a support plate and a central winding rod fixed at the center of the top of the support plate. The support plate is also provided with a plurality of outer winding rods for winding wires distributed in an annular array around the central winding rod. Surrounding the wire rod, the upper ends of the central winding rod and the outer surrounding wire rod are sleeved and fixed with limited rings, and a rotating column is installed at the bottom center of the support plate through a bearing and a fixed frame;

The driving assembly includes a connecting plate and a shaft that is rotated on the moving plate through a bearing. A handle is installed on the upper end of the shaft, and the lower end of the shaft is fixedly connected to the top of the connecting plate. The bottom of the connecting plate has an opening. There are slots that fit the center winding pole and the outer surrounding pole.

As a preferred solution of the present invention, the clamping part includes a horizontal adjustment module, and L-shaped clamping plates for clamping the relay protection device are installed on the two moving bodies of the horizontal adjustment module with opposite movement directions, and The top of the base has a mounting slot for fixing the level adjustment module.

As a preferred solution of the present invention, the storage rack is divided into at least two storage compartments through partition plates, a horizontal bar is provided on the top of the storage rack, and sliding bars are symmetrically provided on both sides of the storage rack, and The control box and the partition board are both provided with sliding channels that slide with the sliding bars.

As a preferred solution of the present invention, two symmetrically distributed locks for fixing the shield are installed on the front and rear sides of the base, and the shield is provided with a bayonet that matches the lock. A handle is installed on the top of the shield.

Based on the above-mentioned AC power grid relay protection sensitivity determination device, the present invention also provides a AC power grid relay protection sensitivity determination method. The specific steps are as follows

Step 1: Determine the resistance range, select a single varistor with suitable resistance value or assemble two or more varistors and connect them in series to form a new varistor;

Step 2: Fix the varistor, adjust the position of the support component through the cooperation of the guide rail and the support component, use the support component to support the varistor, and then use straps to fix the varistor;

Step 3: Fix the relay protection device, and clamp and fix the relay protection device through the cooperation of the horizontal adjustment module and the L-shaped splint;

Step 4: Wiring, through the cooperation between the drive component and the winding frame, release the wires wound on the winding frame, and then use the wires to connect the upper and lower terminals to the circuit according to the one-up-and-down wiring method, so that the varistor is connected to the relay. The electrical protection device is electrically connected, and then the detector is also connected to the circuit using wires;

Step 5: Determine the sensitivity. Through the cooperation of the control component and the adjusting screw, change the number of turns of the resistance wire connected to the circuit, change the resistance of the rheostat connected to the circuit, and then change the voltage. The detector can install relay protection devices in multiple groups. The responses under different voltages are displayed in real time on the touch screen after signal conversion;

Step six: Replace the relay protection device. After the test is completed, disconnect the power supply, remove the wires of the relay protection device, then remove the relay protection device fixed in step three, replace the next relay protection device, and start a new round. detection.

In the above technical solutions, the technical effects and advantages provided by the present invention are:

1. Through the cooperation between the guide rail and the support component, adjust the position of the support component, support the varistor with flexibly configured resistance value through the support component, fix the varistor through straps, and release it through the cooperation between the drive component and the winding frame. The wires wound on the winding frame are used to electrically connect the rheostat, the relay protection device and the detector. Through the cooperation of the control component and the adjusting screw, the number of turns of the resistance wire connected to the circuit is changed, thereby changing the voltage. Detect the reaction of the relay protection device under multiple sets of different voltages to realize the detection of the sensitivity of the relay protection device, with simple operation, flexible use and wide applicability;

2. The motor drives the sector gear, and through the meshing transmission of the sector gear and the transmission gear, the adjustment screw is rotated step by step, so that the nut slide is subject to meshing step sliding, and the nut slide is used to drive the sliding assembly to slide. Change the number of turns of the resistance wire connected to the circuit to achieve the purpose of changing the resistance, and due to the stepwise rotation of the adjusting screw, the resistance changes each time are equal, thus reducing the measurement error;

3. Through the cooperation of the card holder and the clamp head, multiple varistors can be assembled together, and then the varistors can be connected in series by connecting the lower terminals with wires, so that multiple varistors can be connected in series to form a rheostat with a larger resistance, so that According to the user's needs, the resistance value of the varistor can be flexibly configured, making it more convenient to use. Compared with using a sliding varistor, the assembled varistor takes up less space and is more flexible to use;

4. Through the cooperation of the drive assembly and the winding frame, the wires can be freely retracted and retracted, which not only realizes the orderly storage and protection of the wires, but also can effectively avoid the messy and lost wires, and the telescopic setting The rod can change the height of the moving plate, which is helpful for later replacement of damaged wires.

Description of the drawings

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description only describe the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings.

Figure 1 is a schematic diagram of the overall structure of the present invention;

Figure 2 is a first perspective perspective view of the present invention (with the shield omitted);

Figure 3 is a second perspective perspective view of the present invention (with the shield omitted);

Figure 4 is a third perspective view of the present invention (with the shield omitted);

Figure 5 is a perspective view of the winding part of the present invention;

Figure 6 is a disassembled view of the fixing frame and the winding frame of the present invention;

Figure 7 is an installation diagram of the moving plate and drive assembly of the present invention;

Figure 8 is a cross-sectional view of the support part of the present invention;

Figure 9 is an exploded view of the support assembly of the present invention;

Figure 10 is a perspective view of the varistor of the present invention;

Figure 11 is an exploded view of the varistor of the present invention;

Figure 12 is a perspective view of the chuck of the present invention;

Figure 13 is a connection diagram between the base and the shield of the present invention.

Explanation of reference symbols:

1. Base; 11. Lock; 12. Installation box; 13. Control box; 131. Touch screen; 132. Partition; 133. Storage rack; 1331. Divider; 1332. Slider; 1333. Horizontal Rod; 134. Sliding channel; 2. Guard; 21. Bayonet; 3. Adjustment part; 31. Adjustment screw; 32. Motor; 33. Sector gear; 34. Transmission gear; 35. Nut slide; 36. Installation bracket; 37. Metal rod; 38. Sliding component; 4. Relay protection device; 5. Winding part; 51. Fixed frame; 511. Sliding groove; 512. Semicircular through hole; 52. Moving plate; 521 , limit plate; 522, connecting plate; 523, handle; 53, winding frame; 531, support plate; 532, center winding rod; 533, outer surrounding rod; 534, limit ring; 54, telescopic rod; 6. Rheostat; 61. Insulating porcelain cylinder; 62. Resistance wire; 63. Metal hoop; 64. Lower terminal; 65. Clamp; 651. Clamping barrel; 652. Threaded part; 653. Permanent magnet column; 654 , fastening block; 66. Card holder; 661. Card sleeve; 662. Cartridge; 6621. L-shaped fastening groove; 663. Permanent magnet; 67. Threaded sleeve; 7. Horizontal adjustment module; 71. L-shaped splint ; 8. Support part; 81. Guide rail; 811. Convex chute; 812. Strip hole; 82. Support component; 821. T-shaped support block; 8211. Positioning block; 8212. Through hole; 8213. Thread Through hole; 822, sliding bump; 8221, positioning slot; 823, threaded rod; 824, fastening nut; 83, strap.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be introduced in further detail below in conjunction with the accompanying drawings.

The present invention provides an AC power grid relay protection sensitivity determination device as shown in Figures 1-13, including a base 1 and a shield 2 located outside the base 1. In the structure, a mounting box 12 is installed on the top of the base 1 And the control box 13 located opposite the installation box 12. The front panel of the control box 13 is embedded with a touch screen 131. The touch screen 131 can display the reactions of the relay protection device 4 under multiple sets of different voltages. The control box 13 The interior is divided into an installation cavity and a storage cavity through a partition 132. A detector electrically connected to the touch screen 131 is installed in the installation cavity. The detector can signal the reactions of the relay protection device 4 under multiple sets of different voltages. After the conversion, the touch screen 131 performs real-time display. The control box 13 should also be provided with a socket for electrical connection with the detector (omitted in the drawings). The socket provided is convenient for the user to connect the detector to the circuit, which belongs to the existing conventional technology, so the installation position and specific structure of the socket will not be described in detail here. A storage rack 133 is slidably provided in the storage cavity;

A varistor 6 with a resistance value that can be configured flexibly is provided between the installation box 12 and the control box 13. In the structure, the varistor 6 includes an insulating porcelain cylinder 61 and a resistance wire 62 wound around the outer wall of the insulating porcelain cylinder 61. Threaded sleeves 67 are installed at both ends, and the two threaded sleeves 67 are respectively provided with a card base 66 and a clamping head 65;

The adjustable support part 8 is provided at the bottom of the varistor 6. In the structure, the support part 8 includes a guide rail 81, a support component 82 slidably disposed on the guide rail 81, and a strap 83 for fixing the varistor 6. The guide rail 81 is fixed on On the top of the base 1, the support assembly 82 is used to support the varistor 6;

The adjusting part 3 is provided on one side of the varistor 6. In the structure, the adjusting part 3 is used to change the resistance of the varistor 6. The adjusting part 3 includes a control component, an adjusting screw 31, a metal rod 37, and a sliding component slidably disposed on the outer wall of the metal rod 37. 38. Both ends of the metal rod 37 are equipped with upper terminals, and the two upper terminals are respectively fixed on the outer walls of the installation box 12 and the control box 13;

The winding part 5 is provided on one side of the adjusting part 3. In the structure, the winding part 5 is used to organize the wires. The winding part 5 includes a fixed frame 51 and a moving plate 52 provided on the top of the fixed frame 51. The fixed frame 51 is fixed to the base. On the top of the seat 1, a plurality of winding frames 53 distributed in a linear array are rotatably provided on the inside of the fixed frame 51, and a plurality of driving assemblies for driving the winding frames 53 distributed in a linear array are provided on the inner side of the moving plate 52;

The relay protection device 4 is provided on one side of the winding portion 5 and the clamping portion for fixing the relay protection device 4 .

Specifically, to select a varistor 6 with a suitable resistance value, a single resistor 6 with a suitable resistance value can be selected, or two or more varistors 6 can be assembled into a varistor 6 with a suitable resistance value through the provided card holder 66 and the clamp head 65 . , adjust the position of the support component 82, use the support component 82 to support the varistor 6, then use the strap 83 to tie the varistor 6 to fix the varistor 6, fix the relay protection device 4 through the clamping part, and connect the drive component and the winding With the cooperation of the wire frame 53, release the wires wound on the winding frame 53, and then use the wires to connect the upper terminal post and the lower terminal post 64 to the circuit according to the one up and down wiring method (the wiring method of the sliding rheostat), so that the rheostat 6 is connected to the circuit. The relay protection device 4 is electrically connected, and then the detector is also connected to the circuit using wires. Through the cooperation of the control component and the adjusting screw 31, the number of turns of the resistance wire 62 connected to the circuit is changed, and the number of turns of the varistor 6 connected to the circuit is changed. The resistance value, and then the voltage, is changed. The detector can convert the responses of the relay protection device 4 under multiple sets of different voltages into signals and then display them on the touch screen 131 in real time.

Based on the above-mentioned AC power grid relay protection sensitivity determination device, the present invention also provides a AC power grid relay protection sensitivity determination method. The specific steps are as follows

Step 1: Determine the resistance range, select a single varistor 6 with a suitable resistance value, or assemble two or more varistors 6 and connect them in series to form a new varistor 6;

Step 2: Fix the varistor 6, adjust the position of the support component 82 through the cooperation of the guide rail 81 and the support component 82, use the support component 82 to support the varistor 6, and then use the strap 83 to fix the varistor 6;

Step 3: Fix the relay protection device 4, and clamp and fix the relay protection device 4 through the cooperation of the horizontal adjustment module 7 and the L-shaped splint 71;

Step 4: Wiring, through the cooperation between the drive assembly and the winding frame 53, release the wires wound on the winding frame 53, and then use the wires to connect the upper terminal post and the lower terminal post 64 to the circuit according to the one up and down wiring method, so that The varistor 6 is electrically connected to the relay protection device 4, and then the detector is also connected to the circuit using wires;

Step 5: Determine the sensitivity. Through the cooperation of the control component and the adjusting screw 31, change the number of turns of the resistance wire 62 connected to the circuit, change the resistance of the rheostat 6 connected to the circuit, and then change the voltage. The detector can switch the relay protection device 4. The responses under multiple sets of different voltages are displayed in real time on the touch screen 131 after signal conversion;

Step six: Replace the relay protection device 4. After the test is completed, disconnect the power supply, remove the wires of the relay protection device 4, then remove the relay protection device 4 fixed in step three, and replace the next relay protection device 4. Conduct a new round of testing.

Referring to Figures 1-4 and 10-12, in order to improve the applicability of the present invention and realize flexible configuration of the resistance of the varistor 6, both ends of the outer wall of the insulating ceramic cylinder 61 in the structure are covered with metal for fixing the resistance wire 62 Holding hoop 63, the lower terminal 64 is installed on the metal holding hoop 63, and the outer wall of the resistance wire 62 is coated with insulating paint;

In the above technical solution, the card base 66 in the structure includes a ferrule 661 threadedly connected to the threaded sleeve 67 and a cartridge 662 fixed inside the ferrule 661. The outer wall of the cartridge 662 is provided with six L's distributed in an annular array. The snap-fitting groove 6621 has a permanent magnet 663 embedded in the cartridge 662;

In the above technical solution, the structure of the chuck 65 includes a chuck barrel 651 and a threaded portion 652 provided on the outer wall of one end of the chuck barrel 651 for threaded connection with the threaded sleeve 67. The inside of the chuck barrel 651 is provided with a permanent magnet. 663 magnetically attracted permanent magnet posts 653. The inner wall of the clamping barrel 651 is provided with six buckling blocks 654 distributed in an annular array around the permanent magnet posts 653 for adapting to the L-shaped buckling grooves 6621.

Specifically, when two or more varistors 6 need to be assembled together, first insert the snapping block 654 on the chuck 65 of one of the varistors 6 into the L-shaped snapping groove 6621 on the cartridge 662 of the other varistor 6 , and then rotate one of the varistors 6 until the buckling block 654 can no longer move. Through the cooperation of the buckling block 654 and the L-shaped buckling groove 6621, the two varistors 6 can be assembled together. At the same time, the permanent magnet column 653 and the The magnetic connection of the permanent magnet 663 improves the stability of the connection. After assembling a suitable number of varistors 6 in the above method, use wires to connect the lower terminals 64 to connect the varistors 6 in series, so that two or more varistors 6 Forming a rheostat 6 with a larger resistance value, the resistance value of the rheostat 6 can be flexibly configured according to the user's needs, making it more convenient to use.

Referring to Figures 1-4 and 8-9, in order to support and fix the varistors 6 of different lengths, a convex chute 811 is provided at the center line of the guide rail 81 in the structure, and a convex chute 811 is provided at the top of the guide rail 81. There are two strip holes 812 connected with the convex chute 811. The two strip holes 812 are arranged symmetrically. The guide rail 81 can also be provided with a scale mark for determining the distance between the two support components 82, thereby facilitating The user adjusts the distance between the two support components 82;

Among them, the support component 82 in the structure includes a sliding protrusion 822 slidably disposed in the convex chute 811 and a T-shaped support block 821 fixed on the top of the sliding protrusion 822. The top of the T-shaped support block 821 is provided with a V-shaped groove. There are through holes 8212 on both sides of the V-shaped groove for tying the strap 83. A positioning block 8211 is fixed at the center of the bottom of the T-shaped support block 821. A threaded through hole 8213 is provided at the center of the positioning block 8211. Through The sliding bump 822 and the T-shaped support block 821 are bolted together for easy disassembly;

In addition, the top of the sliding protrusion 822 in the structure is provided with a positioning slot 8221 that matches the positioning block 8211. The T-shaped support block 821 can be quickly positioned by using the cooperation between the positioning slot 8221 and the positioning block 8211. The through hole on one side of 8221 is provided with a bolt for fixing the T-shaped support block 821 that is threadedly connected to the threaded through hole 8213. Threaded rods 823 are symmetrically provided on both sides of the positioning slot 8221. The threaded rod 823 is located in the strip hole 812 Inside, a fastening nut 824 for locking the sliding bump 822 is threadedly connected to the outer wall of the threaded rod 823 , and the fastening nut 824 is located on the top of the guide rail 81 .

Specifically, by twisting the fastening nut 824, the locking and unlocking operations of the sliding bump 822 can be completed. When it is necessary to adjust the distance between the two support components 82, after unlocking the sliding bump 822, move the support component by hand. 82 so that it slides along the convex chute 811, and the distance between the two support components 82 can be adjusted. After adjusting the distance between the rear support components 82, put the rheostat 6 into the V-shaped groove, and then use The strap 83 is used to fasten the rheostat 6 to complete the fixation of the rheostat 6, and the operation is very simple.

Referring to Figures 1-4, in order to realize automatic adjustment of the resistance of the rheostat 6 so that the resistance changes are equal, the control component in the structure includes a motor 32 arranged inside the installation box 12. The output shaft of the motor 32 is keyed to a sector gear 33. The top of the gear 33 is meshed with a transmission gear 34, and one end of the adjustment screw 31 in the structure is rotatably connected to the control box 13 through a bearing. The other end of the adjustment screw 31 penetrates the installation box 12 and is fixedly connected to the transmission gear 34. The adjustment screw 31 is fixedly connected to the transmission gear 34. The other end of the rod 31 is rotationally connected to the mounting box 12 through a bearing. The outer wall of the adjusting screw 31 is covered with a nut slide 35 that moves horizontally along the adjusting screw 31. A mounting bracket 36 is installed on one side of the nut slide 35;

Among them, the sliding component 38 in the structure includes a U-shaped member slidably provided on the outer wall of the metal rod 37 and a figure-eight sliding piece fixed inside the U-shaped piece. The top of the U-shaped piece is fixedly connected to the bottom of the mounting bracket 36, and the figure-eight sliding piece is slidably provided. on the outer wall of the resistance wire 62.

Specifically, the motor 32 is started, and the sector gear 33 is driven by the motor 32. Through the meshing transmission of the sector gear 33 and the transmission gear 34, the adjustment screw 31 is rotated step by step, so that the nut slide 35 is subject to meshing step sliding. , the nut slide 35 is used to drive the sliding component 38 to slide to change the number of turns of the resistance wire 62 connected to the circuit, thereby achieving the purpose of changing the resistance, and due to the stepwise rotation of the adjusting screw 31, the resistance changes each time are all equal, thereby reducing measurement errors.

It should be noted that the sector gear 33 and the transmission gear 34 can be adjusted according to actual needs. For example, when the sector gear 33 rotates one circle, the transmission gear 34 drives the adjusting screw 31 to rotate one-third of a circle, one-half or four turns. One turn.

Referring to Figures 1-4 and 5-7, in order to store the wires in an orderly manner and prevent the wires used for electrical connection from being disorganized and lost, a set of linear arrays are provided on both sides of the fixed frame 51 in the structure. The sliding groove 511 has a semicircular through hole 512 connected with the sliding groove 511 at the bottom, and two telescopic rods 54 for connecting the moving plate 52 are symmetrically installed on the inside of the fixed frame 51 in the structure. The bottom of 52 is provided with two sets of limiting plates 521 distributed in a linear array for sliding cooperation with the sliding groove 511. The bottom of the limiting plate 521 is provided with a semicircular through hole 512. The limiting plates 521 and the sliding groove 511 are The semicircular through holes 512 together form a circular through hole that can allow the wire to pass through. The wire is limited through the circular through hole. The two ends of the wire used are Dupont heads or alligator clips, which can be electrically connected to the binding posts. The terminal block can not only limit the position of the wire and prevent the wire from entering the fixing frame 51, but also reduce the difficulty of wiring;

Among them, the winding frame 53 in the structure includes a support plate 531 and a central winding rod 532 fixed at the top center of the support plate 531. The support plate 531 is also provided with a plurality of winding rods distributed in an annular array around the central winding rod 532. The upper ends of the outer surrounding wire rod 533 for winding wires, the central winding rod 532 and the outer surrounding wire rod 533 are all sleeved and fixed with a limiting ring 534, and the bottom center of the support plate 531 in the structure is installed with a bearing and a fixed frame. 51 Rotating column of rotating connection;

In addition, the driving component in the structure includes a connecting plate 522 and a shaft mounted on the moving plate 52 through bearing rotation. The upper end of the shaft is equipped with a handle 523, the lower end of the shaft is fixedly connected to the top of the connecting plate 522, and the bottom of the connecting plate 522 Slots adapted to the central winding rod 532 and the outer surrounding wire rod 533 are provided.

Specifically, the telescopic rod 54 drives the moving plate 52 upward to expose the winding frame 53, wind the middle part of the conductor along the central winding rod 532, and then place both ends of the conductor on the semicircular passage on the sliding groove 511. hole 512, use the adjacent outer surrounding wire rod 533 to clamp the wire. In order to improve the stability of the wire, a tie can also be used to fix it. Then the telescopic rod 54 drives the moving plate 52 back to the original position, so that the center winding rod 532 and Insert the outer surrounding wire rod 533 into the slot on the connecting plate 522. By rotating the handle 523, the connecting plate 522 drives the winding frame 53 to rotate. The rotating winding frame 53 is used to make the wire wind around the winding frame 53. It is necessary to use a wire. At this time, turn the handle 523 in the opposite direction, and then pull out the wires by hand, which not only realizes the orderly storage of the wires and protects the wires, but also effectively avoids the messy wires and the loss of the wires.

In the above solution, in order to fix the relay protection device 4 and prevent the wiring from being disconnected due to operations such as accidental contact, the clamping part of the structure includes a horizontal adjustment module 7, and the two movement directions of the horizontal adjustment module 7 move in opposite directions. L-shaped splints 71 for clamping the relay protection device 4 are installed on the body, and the top of the base 1 in the structure is provided with an installation slot for fixing the horizontal adjustment module 7. The horizontal adjustment module 7 can be a two-way linear module. Set, by starting the horizontal adjustment module 7, the moving body drives the L-shaped clamping plate 71 to move, and the L-shaped clamping plate 71 is used to clamp the relay protection device 4 to fix the relay protection device 4.

In the above solution, in order to improve the applicability of the present invention, the storage rack 133 in the structure is divided into at least two storage compartments through the partition plate 1331. The top of the storage rack 133 is provided with a cross bar 1333. The cross bar 1333 is provided to facilitate access. The storage rack 133 is placed, and sliding bars 1332 are symmetrically provided on both sides of the storage rack 133. Through the cooperation of the sliding bars 1332 and the sliding channel 134, the rapid positioning of the storage rack 133 is achieved, and the control box 13 and the partition in the structure are 132 is provided with a sliding channel 134 that is slidably matched with the sliding bar 1332, and the rheostat 6, screwdriver and other electrical devices and tools can be placed in the storage compartment for storage.

In the above solution, two symmetrically distributed locks 11 for fixing the shield 2 are installed on the front and rear sides of the base 1 in the structure. The locks 11 can be luggage locks used in luggage in the prior art. Conventional technology, its specific structure will not be described in detail here, and in the structure, the shield 2 is provided with a bayonet 21 that matches the lock 11, and a handle is installed on the top of the shield 2. The shield 2 provided has the function of It has dust-proof function, and the handle provided on the protective cover 2 is convenient for carrying the device.

Certain exemplary embodiments of the present invention have been described above only by way of illustration. It goes without saying that those skilled in the art can implement various embodiments in various ways without departing from the spirit and scope of the present invention. The described embodiments are modified. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the claims of the present invention.

Claims (5)

1. The utility model provides an alternating current network relay protection sensitivity determining means, includes base (1) and is located guard shield (2) in the outside of base (1), its characterized in that: the device comprises a base (1), wherein an installation box (12) and a control box (13) positioned opposite to the installation box (12) are arranged at the top of the base, a touch screen (131) is embedded on a front panel of the control box (13), an installation cavity and a storage cavity are formed in the control box (13) through a partition plate (132), a detector electrically connected with the touch screen (131) is arranged in the installation cavity, and a storage rack (133) is arranged in the storage cavity in a sliding mode;

the varistor (6) is arranged between the mounting box (12) and the control box (13) and can flexibly configure resistance, the varistor (6) comprises an insulating porcelain cylinder (61) and a resistance wire (62) wound on the outer wall of the insulating porcelain cylinder (61), screw sleeves (67) are arranged at two ends in the insulating porcelain cylinder (61), and clamping seats (66) and clamping heads (65) are respectively arranged at the two screw sleeves (67);

the adjustable supporting part (8) is arranged at the bottom of the rheostat (6), the supporting part (8) comprises a guide rail (81), a supporting component (82) arranged on the guide rail (81) in a sliding mode and a binding band (83) used for fixing the rheostat (6), the guide rail (81) is fixed at the top of the base (1), and the supporting component (82) is used for supporting the rheostat (6);

the adjusting part (3) is arranged at one side of the rheostat (6), the adjusting part (3) is used for changing the resistance of the rheostat (6), the adjusting part (3) comprises a control assembly, an adjusting screw rod (31), a metal rod (37) and a sliding assembly (38) which is arranged on the outer wall of the metal rod (37) in a sliding manner, two ends of the metal rod (37) are provided with upper binding posts, and the two upper binding posts are respectively fixed on the outer walls of the mounting box (12) and the control box (13);

the wire winding part (5) is arranged at one side of the adjusting part (3), the wire winding part (5) is used for arranging wires, the wire winding part (5) comprises a fixing frame (51) and a moving plate (52) arranged at the top of the fixing frame (51), the fixing frame (51) is fixed at the top of the base (1), a plurality of wire reels (53) distributed in a linear array are rotatably arranged at the inner side of the fixing frame (51), and a plurality of driving components distributed in a linear array and used for driving the wire reels (53) are arranged at the inner side of the moving plate (52);

the relay protection device (4) is arranged on one side of the winding part (5), and the clamping part is used for fixing the relay protection device (4);

metal hoops (63) for fixing resistance wires (62) are sleeved at two ends of the outer wall of the insulating porcelain tube (61), lower binding posts (64) are mounted on the metal hoops (63), and insulating paint is coated on the outer wall of the resistance wires (62);

the clamping seat (66) comprises a clamping sleeve (661) in threaded connection with the threaded sleeve (67) and a clamping cylinder (662) fixed inside the clamping sleeve (661), six L-shaped buckling grooves (6621) distributed in an annular array are formed in the outer wall of the clamping cylinder (662), and a permanent magnet (663) is embedded in the clamping cylinder (662);

the clamping head (65) comprises a clamping cylinder (651) and a threaded part (652) which is arranged on the outer wall of one end of the clamping cylinder (651) and is in threaded connection with a threaded sleeve (67), permanent magnet columns (653) which are magnetically attracted with the permanent magnets (663) are arranged in the clamping cylinder (651), and six buckling blocks (654) which are distributed in an annular array mode around the permanent magnet columns (653) and are used for adapting to L-shaped buckling grooves (6621) are arranged on the inner wall of the clamping cylinder (651);

a convex-shaped sliding groove (811) is formed in the center line position of the guide rail (81), two strip-shaped holes (812) communicated with the convex-shaped sliding groove (811) are formed in the top of the guide rail (81), and the two strip-shaped holes (812) are symmetrically arranged;

the support assembly (82) comprises a sliding lug (822) which is arranged in the convex sliding groove (811) in a sliding mode and a T-shaped support block (821) which is fixed at the top of the sliding lug (822), a V-shaped groove is formed in the top of the T-shaped support block (821), through holes (8212) for binding bands (83) are formed in two sides of the V-shaped groove, a positioning fixture block (8211) is fixed at the center position of the bottom of the T-shaped support block (821), and a threaded through hole (8213) is formed in the center position of the positioning fixture block (8211);

a positioning clamping groove (8221) matched with the positioning clamping block (8211) is formed in the top of the sliding lug (822), a bolt which is in threaded connection with the threaded through hole (8213) and used for fixing the T-shaped supporting block (821) is arranged in a through hole on one side of the positioning clamping groove (8221), threaded rods (823) are symmetrically arranged on two sides of the positioning clamping groove (8221), the threaded rods (823) are positioned in the strip-shaped holes (812), and a fastening nut (824) used for locking the sliding lug (822) is connected to the outer wall of the threaded rods (823) in a threaded mode, and the fastening nut (824) is positioned at the top of the guide rail (81);

the control assembly comprises a motor (32) arranged in the mounting box (12), an output shaft key of the motor (32) is connected with a sector gear (33), the top of the sector gear (33) is connected with a transmission gear (34) in a meshed mode, one end of the adjusting screw (31) is rotationally connected with the control box (13) through a bearing, the other end of the adjusting screw (31) penetrates through the mounting box (12) and then is fixedly connected with the transmission gear (34), the other end of the adjusting screw (31) is rotationally connected with the mounting box (12) through a bearing, a nut sliding seat (35) horizontally moving along the adjusting screw (31) is sleeved on the outer wall of the adjusting screw (31), and a mounting bracket (36) is mounted on one side of the nut sliding seat (35);

the sliding assembly (38) comprises a U-shaped piece and a splayed sliding sheet, the U-shaped piece is arranged on the outer wall of the metal rod (37) in a sliding mode, the splayed sliding sheet is fixed inside the U-shaped piece, the top of the U-shaped piece is fixedly connected with the bottom of the mounting bracket (36), and the splayed sliding sheet is arranged on the outer wall of the resistance wire (62) in a sliding mode;

a group of sliding grooves (511) distributed in a linear array are formed in two sides of the fixed frame (51), semicircular through holes (512) communicated with the sliding grooves (511) are formed in the bottoms of the sliding grooves (511), two telescopic rods (54) used for connecting the moving plates (52) are symmetrically arranged on the inner sides of the fixed frame (51), two groups of limiting plates (521) distributed in a linear array and used for being in sliding fit with the sliding grooves (511) are arranged at the bottoms of the moving plates (52), and the semicircular through holes (512) are formed in the bottoms of the limiting plates (521);

the winding frame (53) comprises a support disc (531) and a central winding rod (532) fixed at the central position of the top of the support disc (531), the support disc (531) is also provided with a plurality of peripheral winding rods (533) which are distributed around the central winding rod (532) in a ring array mode and are used for winding wires, the upper ends of the central winding rod (532) and the peripheral winding rods (533) are sleeved and fixed with limiting rings (534), and the central position of the bottom of the support disc (531) is provided with rotating columns which are rotationally connected with a fixing frame (51) through bearings;

the driving assembly comprises a connecting disc (522) and a shaft rod which is rotatably arranged on the movable plate (52) through a bearing, a handle (523) is arranged at the upper end of the shaft rod, the lower end of the shaft rod is fixedly connected with the top of the connecting disc (522), and a slot which is matched with the central winding rod (532) and the peripheral winding rod (533) is formed in the bottom of the connecting disc (522).

2. The alternating current power grid relay protection sensitivity determination device according to claim 1, wherein: the clamping part comprises a horizontal adjusting module (7), L-shaped clamping plates (71) used for clamping the relay protection device (4) are arranged on two moving bodies with opposite movement directions of the horizontal adjusting module (7), and the top of the base (1) is provided with a mounting groove used for fixing the horizontal adjusting module (7).

3. The alternating current power grid relay protection sensitivity determination device according to claim 1, wherein: the storage rack is characterized in that at least two storage grids are arranged in the storage rack (133) through a partition plate (1331), a cross rod (1333) is arranged at the top of the storage rack (133), sliding strips (1332) are symmetrically arranged on two sides of the storage rack (133), and sliding channels (134) which are in sliding fit with the sliding strips (1332) are formed in the control box (13) and the partition plate (132).

4. The alternating current power grid relay protection sensitivity determination device according to claim 1, wherein: the locking device is characterized in that two locking devices (11) which are symmetrically distributed and used for fixing the protective cover (2) are arranged on the front side and the rear side of the base (1), a bayonet (21) which is matched with the locking devices (11) is formed in the protective cover (2), and a handle is arranged at the top of the protective cover (2).

5. An ac power grid relay protection sensitivity determining method, comprising the ac power grid relay protection sensitivity determining device according to any one of claims 1 to 4, characterized in that: the method comprises the following steps of

Step one: determining a resistance range, selecting a single varistor (6) with a proper resistance value or assembling and connecting two or more varistors (6) in series to form a new varistor (6);

step two: the varistor (6) is fixed, the position of the supporting component (82) is adjusted through the matching of the guide rail (81) and the supporting component (82), and after the varistor (6) is supported by the supporting component (82), the varistor (6) is fixed by using the binding band (83);

step three: the relay protection device (4) is fixed, and the relay protection device (4) is clamped and fixed through the cooperation of the horizontal adjusting module (7) and the L-shaped clamping plate (71);

step four: wiring, namely discharging a wire wound on the winding frame (53) through the cooperation of the driving assembly and the winding frame (53), connecting the upper wiring terminal and the lower wiring terminal (64) into a circuit by using the wire in a top-to-bottom wiring mode, electrically connecting the rheostat (6) with the relay protection device (4), and connecting the detector into the circuit by using the wire;

step five: the sensitivity is determined, the number of turns of the resistor wire (62) connected to the circuit is changed through the matching of the control component and the adjusting screw rod (31), the resistance value of the rheostat (6) connected to the circuit is changed, the voltage is further changed, and the detector can display the response of the relay protection device (4) under a plurality of groups of different voltages in real time through signal conversion and then through the touch screen (131);

step six: and (3) replacing the relay protection device (4), disconnecting the power supply after the detection is finished, removing the lead of the relay protection device (4), removing the relay protection device (4) fixed in the third step, replacing the next relay protection device (4), and detecting for a new round.