CN108963875A - The method of on-load migration 10KV overhead transmission line - Google Patents

Abstract

The invention relates to a method for transferring a 10KV overhead line with load. The method comprises the following steps: (1), insulating and shielding the electrified body and the connecting body within the working range, (2), installing a temporary load switch and a drainage cable, (3) Insulate and shield the three-phase wires, cross arms, porcelain bottles, pole top brackets and connecting components. (4) Connect the three-phase wires of the distribution lines at both ends of the fatigued line to the temporary drainage cables and insulate and shield them. (5) Clamp off the two ends of the three-phase leads that need to be transferred, (6), transfer the lines, (7), connect the three-phase leads of the transfer lines and live lines, and insulate and shield them, (8), remove the temporary Load switch and drain cable. The method of transferring 10KV overhead lines with load ensures uninterrupted power consumption of users, improves the reliability of power supply, and improves the economic benefits of power supply enterprises.

Description

The method of transferring 10KV overhead line with load

technical field

The invention relates to a method for transferring lines in a distribution network, in particular to a method for transferring 10KV overhead lines with load.

Background technique

The distribution network is a power supply system directly facing users, providing safe, reliable, economical, efficient, clean and sustainable electric energy for power users. The overhead power distribution network covers every corner of urban and rural areas, and the wiring layout is dense and complex, and the corridors are narrow. Due to the gradual improvement of urban and rural planning, people pay more and more attention to a good city appearance, and the government continues to increase efforts to transform old buildings such as shantytowns. It is precisely because of the relocation of buildings and the beauty of the city that the early planning and design of the geographic location of our overhead distribution network affects the overall advancement of urban planning to a large extent, which requires us to re-plan and design the overhead distribution network 10KV The path of the line and the direction of the line. After the completion of planning and design, the route of the 10KV overhead line will be carried out in the form of power outage during the relocation and construction. The operator needs to cut off the power of the branch of the 10KV overhead line or even the entire 10KV overhead line, and then in the state of no power on the 10KV overhead line The relocation of the 10KV overhead line will cause a lot of impacts on the daily life of the residents due to large-scale power outages. At the same time, it will also cause huge economic losses to government agencies, factories and mines, cause unnecessary economic losses to power supply companies, and affect the reliability of power supply. Reduce the economic benefits of power supply enterprises.

There is an urgent need for a method for migrating 10KV overhead lines with load aimed at the above-mentioned defects.

Contents of the invention

The purpose of the present invention is to provide a method for migrating 10KV overhead lines with load. This method can realize the migration construction of 10KV overhead lines without power failure for users, and solve the inconvenience caused by large-scale power outages to residents and to factories and mines. and the economic loss caused by the power supply company.

Technical scheme of the present invention is:

The method for transferring 10KV overhead lines with load includes the following steps:

(1) Two temporary load switches are transported to the site at both ends of the relocated line by trucks, and an insulating pulley bracket is placed at a certain distance under the entire relocated line as a bracket for temporary drainage cables;

(2) Transport the temporary drainage cable to the construction site and lay it between two temporary load switches. When laying the cable, care should be taken to prevent the temporary drainage cable from slipping off the bracket and wear the outer insulation of the cable. Temporary insulating cross-arms are installed at appropriate positions on the poles;

(3) Connect the two ends of the three-phase temporary drainage cable to the two temporary load switches respectively. After the connection is complete, install insulating shields at the two connections, and check that the two temporary load switches are in the disconnected position;

(4) The electrician in the bucket enters the work bucket with insulated work tools and shielding tools, fastens the safety belt, and operates the insulated bucket arm truck to enter the live working area. Insulate and shield the three-phase wires, cross-arms, porcelain bottles, pole-top brackets and connecting components from low to high;

(5) The ground electrician transfers the three-phase lead wires of the load switch to the electrician in the bucket by using the insulating rope and the insulating pulley, and fixes the three-phase lead wires on the temporary insulating cross-arm, and the electrician in the bucket installs the three phases in order from near to far. The phase leads and the three-phase leads are respectively installed on the three-phase conductors of the distribution line in the front section of the relocated line. It should be noted that after each phase is installed, the insulation and shielding of the connection between the lead wires and the wires must be restored;

(6) According to the method of step ⑤, install the three-phase leads of the temporary load switch at the other end of the line;

(7) Close the two temporary load switches, measure the current on the three-phase leads with a clamp ammeter, and confirm that the load has been transferred to the temporary drainage cable;

(8) The electrician in the bucket clamps off the three-phase lead wires of the transferred line in order from far to near. , the live parts should be quickly insulated and shielded. According to this method, disconnect the lead wire at the other end of the transferred line;

(9) Ground electricians carry out the construction of the relocated lines (including erecting line poles, installing cross-arms, installing insulators, laying three-phase wires, etc.);

(10) The insulated bucket arm truck is transferred to a suitable position at the pole at one end of the line after it has been moved and fixed, and the electrician in the bucket controls the insulating bucket to a suitable position, according to the order from near to far, from the electrified body to the grounding body, from the low Insulate and shield the three-phase conductors, cross-arms, porcelain bottles, pole-top brackets and connecting components, respectively;

According to the order from near to far, respectively connect the three-phase lead wires of the relocated line and the live line. It should be noted that when connecting a phase, only remove the insulation and shielding equipment of this phase. , lead wires, porcelain bottles, etc. to restore insulation shielding;

After the three-phase leads are connected, remove all insulation and shielding appliances on the pole at this end in the order from far to near and from top to bottom;

(11) According to the method of step (10), complete the lead wire connection work at the other end of the migrated line. After checking and confirming that the connection is intact and the flow is normal, remove all insulation and shielding appliances on the pole at this end;

(12) The ground electrician disconnects the two temporary load switches respectively, loosens the connection between the temporary load switch and the temporary drainage cable, and recovers the temporary drainage cable;

(13) The insulated bucket arm truck is transferred to the connection between the live line and the lead wire of the temporary load switch. The electrician in the bucket moves the insulating bucket to a suitable position, and removes the three-phase lead wires of the temporary load switch in order from far to near. At the same time, according to From far to near, from top to bottom, remove all insulation shielding appliances and temporary insulation cross-arms on the pole at this end. According to the above method, transfer the insulating arm truck to the other end of the live line and fix it, and remove the temporary load at this end. The three-phase leads of the switch should be removed at the same time from all insulation shielding appliances and temporary insulation cross-arms on the pole at this end. After the completion of the work, the electrician in the bucket returned to the ground, put away the insulation bucket truck, and the work was completed, and the work team was evacuated from the work site.

Beneficial effects of the present invention:

The method for transferring 10KV overhead lines with load in the present invention is not limited by the reliability of power supply, does not affect the normal power supply to users, and can realize the transfer of 10KV overhead lines with load and without power failure. If users with high power supply reliability requirements cannot relocate 10KV overhead lines due to power outage, the construction work of 10KV overhead line relocation can still be realized, increasing economic benefits and improving power supply reliability.

Description of drawings

Fig. 1 is a structural schematic diagram of a 10KV line equipped with a section switch as shown in the present invention.

Detailed ways

In order to solve the defects in the prior art, the inventor has designed a method for transferring 10KV overhead lines under load using the insulating glove method. In this way, the 10KV overhead line can be migrated without power failure, without causing losses to power users or power supply companies, improving power supply reliability and economic benefits.

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in the figure, the method for migrating 10KV overhead lines with load includes the following steps:

(1) Before starting construction, conduct on-site surveys, formulate detailed construction plans, and through learning, make the personnel participating in the construction clear about the specific construction steps, specific division of labor and safety precautions.

(2) All staff arrive at the work site, arrange safety guardrails and work signs, insulated bucket arm truck 1 enters one end of the moved line, locates at the best working position (below the connection point 2 of the three-phase wire 9) and installs it Grounding wire, select the lifting direction of the working bucket, and pay attention to avoid nearby high and low voltage lines and obstacles.

(3) Transport the two temporary load switches 3 to the site at both ends of the relocated line respectively by the truck. Below the entire circuit being moved, an insulating support 4 is placed at regular intervals as a support for the temporary drainage cable 5 .

(4) The temporary drainage cable 5 is transported to the construction site and laid between two temporary load switches. When laying the cables, care should be taken to prevent the temporary drainage cables from slipping off the insulating support and wearing out the outer insulation of the cables. Temporary insulating cross-arm 7 is installed at the appropriate position of electric pole 6 by the ground operator boarding the pole.

(5) Connect the two ends of the three-phase temporary drainage cable to two temporary load switches respectively. After the connection is complete, install insulating shields at the two connections, and check that the two temporary load switches are in the disconnected position.

(6) The electrician in the work bucket shall check the insulation protection equipment, insulation tools, safety equipment and auxiliary equipment before operation, and use a megohmmeter or insulation tester to conduct segmental testing on the insulation tools, and the insulation resistance shall not be less than 700 megohms; Douzhong electricians should wear a full set of insulating protective equipment such as insulating boots, insulating clothing (shawl), insulating helmets and insulating gloves. The electrician in the bucket enters the working bucket with insulated work tools and shielding appliances. The tools and shielding appliances should be placed in the bucket and tool bag by category, and the safety belt should be fastened. After being approved by the person in charge of the work, two electricians in the bucket respectively operate the insulated bucket arm truck and enter the live working area; the movement of the insulating bucket should be stable and uniform, and there should be no large shaking when entering the live working area. It should not exceed 0.5m/s, and the maximum linear speed at the edge of the insulating bucket should not exceed 0.5m/s; during the rising process of the working bucket, the high and low voltage live parts within the possible reach should be insulated and shielded.

(7) After the working bucket is positioned at a suitable working position, first install a wire shielding cover on the side phase wire closest to the body. The opening of the inserted wire shielding cover should face downward and be pulled to the edge of the insulator. Insulation clips clamp to prevent falling off. The overlapping distance of insulation shielding combination shall not be less than 15cm. According to the principle of from near to far, from electrified body to grounding body, from low to high, use the same shielding method as above to insulate and shield the three-phase wires, cross arms, porcelain bottles, pole top brackets and connecting components respectively.

(8) The electrician on the ground transfers the three-phase leads 8 of the load switch to the electrician in the bucket respectively by using insulating ropes and insulating pulleys, and fixes the three-phase leads on the temporary insulating cross-arm, and the electrician in the bucket installs them in order from near to far The three-phase leads are respectively installed on the three-phase conductors 9 of the distribution line at the front section of the moved line. It should be noted that every time a phase is installed, the insulation and shielding of the connection between the lead wire and the wire must be restored.

(9) According to the method of step ⑧, install the three-phase leads of the temporary load switch at the other end of the line.

(10) Close the two temporary load switches, measure the current on the three-phase leads with a clamp ammeter, and confirm that the load has been transferred to the temporary drainage cable.

The electrician in Dounei respectively clamps off the three-phase leads of the transferred line in order from far to near. When the clamp is broken, measures should be taken to prevent the broken end of the lead wire from lapping to other live parts or grounding components. After the clamp is broken, the live parts should be quickly insulated and shielded.

(11) According to the method of step ⑩, disconnect the lead wire at the other end of the transferred line. The ground electrician will carry out the construction of the relocated line (including erecting the straight pole of the line, installing the cross arm, installing insulators, laying three-phase wires, etc.).

(12) Transfer the insulated bucket arm truck to a suitable position at the electric pole at one end of the line after it has been moved and fix it. The electrician in the bucket controls the insulating bucket to a suitable position. Insulation and shielding of the three-phase wires, cross arms, porcelain bottles, pole top brackets and connecting components are carried out in accordance with the high principle.

In the order from near to far, respectively connect the three-phase leads of the migrated line and the live line. It should be noted that every time a phase is connected, only the insulation shielding equipment of that phase is removed, and after confirming that the connection is intact, the insulation shielding of the wires, lead wires, porcelain bottles, etc. of the phase is quickly restored.

After the three-phase leads are connected, remove all insulation and shielding appliances on the pole at this end in the order from far to near and from top to bottom.

(13) According to the method in (12), complete the lead wire connection at the other end of the relocated line. After checking and confirming that the connection is intact and the flow is normal, remove all insulation shielding appliances and temporary insulation cross-arms on the pole at this end .

The ground electrician disconnected the two temporary load switches respectively, untied the connection between the temporary load switch and the temporary drainage cable, and recovered the temporary drainage cable.

The insulated bucket arm truck is transferred to the connection between the live line and the lead wire of the temporary load switch. 1. From top to bottom, remove all insulation and shielding appliances on the pole at this end.

(14) According to the method of step (13), the insulated bucket arm truck is transferred to the other end of the live line and fixed, and the three-phase lead wire of the temporary load switch at this end is removed, and all insulation shielding appliances and temporary wires on the pole at this end are removed at the same time Insulated cross arm. After the completion of the work, the electrician in the bucket returned to the ground and put away the insulated bucket truck.

(15) Clean up the construction site, and the person in charge of the work will comprehensively check the completion of the work.

Claims (1)

1. a kind of method of on-load migration 10KV overhead transmission line, it is characterised in that:

The following steps are included:

(1), two provisional weight switches are transported to respectively by bogie and are migrated route both ends scene, be migrated entire route Lower section, place an insulating block bracket, bracket as interim leading cable every a certain distance；

(2), interim leading cable is transported to construction site, between two provisional weights of being laid in switch, when cabling, should infused Meaning prevents interim leading cable from sliding from bracket and wearing cable external insulation, steps on bar in the appropriate position of electric pole by ground operation personnel Set the interim insulator crossarm of installation；

(3), the interim leading cable both ends of three-phase are respectively connected on two provisional weight switches, after connection is intact, respectively two Insulated shielding cover is installed in junction, and checks two provisional weight switches in open position；

(4), electrician carries insulation power tool in struggling against and masking apparatus enters working bucket, and fastens seat belts, operation insulation bucket Arm vehicle enters livewire work region, and the interior electrician that struggles against is according to by closely to remote, principle from electrical body to grounding body, from low to high, dividing It is other that insulation masking is carried out to three-phase conducting wire, cross-arm, porcelain vase, bar ceiling hold and connecting elements；

(5), three phase terminal of on-load switch is passed to electrician in bucket respectively using insulating cord and insulation coaster by ground electrician, by three Phase terminal is fixed on interim insulator crossarm, and the interior electrician that struggles against installs three phase terminals, three phase terminals according to sequence from the near to the distant Be separately mounted to be migrated on the distribution line three-phase conducting wire of route leading portion, it should be noted that often install a phase it is necessary to lead and Restore insulation masking in the junction of conducting wire；

(6), the method according to step 5., three phase terminals of the provisional weight switch of the installation route other end；

(7), two provisional weight switches are closed, measures the electric current on three phase terminals with clamp on amperemeter, confirmation load has turned It moves on on interim leading cable；

(8), electrician clamps disconnected three phase terminals for being migrated route respectively according to sequence from the distant to the near and should take when pincers are disconnected in struggling against Measure prevents lead broken end from snapping on other charging member or earthing component, and pincers are had no progeny, and should be carried out rapidly absolutely to live part Edge masking disconnects the lead for being migrated the route other end in this way；

(9), ground electrician carries out construction (including vertical route straight-bar, installation cross-arm, the installation insulator, laying three of migration route Phase conductor etc.)；

(10), the suitable position that aerial lift device with insulated arm is transferred at route one end electric pole after having migrated fixes, and struggle against interior electrician Control insulation bucket is to suitable position, according to by closely to remote, principle from electrical body to grounding body, from low to high, respectively to three-phase Conducting wire, cross-arm, porcelain vase, bar ceiling hold and connecting elements carry out insulation masking；

According to by closely to remote sequence, being separately connected three phase terminals of route and alive circuit after migration, it should be noted that every connection When one phase, the insulation masking apparatus of the phase is only removed, it is extensive to the conducting wire of the phase, lead, porcelain vase etc. rapidly after confirmation connection is intact Multiple insulation masking；

After three phase terminals connect, according to sequence from the distant to the near, from top to bottom, all insulation on this end line bar are removed Cover apparatus；

(11), according to the method for step (10), the lead connection work of the route other end after having migrated is completed, checks confirmation Connect it is intact, through-flow it is normal after, remove all insulation masking apparatus on the end line bar；

(12), ground electrician is each turned off two provisional weight switches, unlocks the company of provisional weight switch and interim leading cable It connects, recycles interim leading cable；

(13), aerial lift device with insulated arm is transferred to the lead junction of alive circuit and provisional weight switch, and the interior electrician that struggles against shifts insulation Bucket removes three phase terminals of provisional weight switch according to sequence from far near to suitable position respectively, meanwhile, according to by remote and Closely, sequence from top to bottom removes all insulation masking apparatus and interim insulator crossarm on this end line bar, according to above-mentioned side Method, aerial lift device with insulated arm are transferred to the alive circuit other end and fix, and remove three phase terminals of the provisional weight switch at the end, simultaneously All insulation masking apparatus and the interim insulator crossarm on this end line bar are removed, electrician returns to ground in the back bucket that completes, and packs up Aerial lift device with insulated arm, work terminate, and shift withdraws operation field.