CN117895376A - Operation method for transferring rod wire under uninterrupted power supply - Google Patents

Abstract

The present invention discloses a method for relocating poles and lines under uninterrupted power supply, comprising the following steps: S100, erecting the same number of pole towers as the relocated line beside the relocated line, installing switches on the first pole tower, and installing branch cross arms and straight insulators under the conductors of the first pole tower, the last pole tower and the first branch line pole tower to fix the conductors extending from the new pole tower; S200, judging whether the pole tower is a tension pole tower, if yes, skipping this step, if not, changing the pole tower to a tension pole tower; S300, carrying out live load transfer; S500, dismantling the old line. The advantages of the present invention are: it does not affect the power supply of the branch line, and ensures the normal operation of the low-voltage line, the line relocation is completed and the devices on the pole towers on the relocated line remain basically unchanged, and the devices meet the standards.

Description

A method for migrating poles under uninterrupted power supply

Technical Field

The invention relates to a method for line migration in a distribution network, and in particular to an operation method for migrating pole lines under uninterrupted power supply.

Background technique

In the process of urban development and power grid construction, it is often necessary to relocate existing overhead lines. In particular, when the pole tower position and line path need to be relocated in a small area due to road construction, municipal planning and other factors, the 10kV distribution line and the 0.4kV low-voltage line under the pole tower must be relocated and the line relocation must be completed without power outage. Currently, neither the training materials nor the standard system cover this operation.

Summary of the invention

The purpose of the present invention is to provide an operation method for relocating poles under uninterrupted power supply, which can effectively avoid safety accidents caused by incorrect operation methods and inadequate safety measures. It is applicable to various working conditions on site, and effectively separates the energized lines and the power-off lines within the span by using tools and equipment such as insulated tensioners, mobile box transformers and bypass cables, ensuring a clear and safe interface between energized construction and power-off construction, so that maintenance and construction work can be carried out safely and orderly on site.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

A method for relocating a pole line under uninterruptible power supply, wherein the relocation line includes a first pole tower at the head and a last pole tower at the tail, and the relocation line is also connected to a branch line, wherein the pole tower on the branch line closest to the relocation line is a first branch line pole tower, and the method for relocating a pole line under uninterruptible power supply includes the following steps:

S100. Erect the same number of pole towers as the relocated line beside the relocated line, install switches on the first pole tower, and install branch cross arms and straight insulators under the conductors of the first pole tower, the last pole tower and the first branch line tower to fix the conductors extending from the new pole tower;

S200, determining whether the pole tower is a tension pole tower, if yes, skipping this step, if no, changing the pole tower to a tension pole tower;

S300, carry out live load transfer:

S310, use the lead wire as the tension pole jumper to connect the new wire of the end tower with the large side wire;

S320, use the lead wire as a tension pole jumper to connect the new wire of the first branch line tower with the large side wire under power, and check whether the phase is correct at the upper and lower piles of the drop-out fuse of the tower connecting the new line and the first branch line tower. If it is correct, close the drop-out fuse;

S330, check whether the phase is correct at the switch of the first tower, close the switch after confirming that it is correct, and measure whether the current shunting of the new line and the old line is normal at two points of the first tower and the first branch line tower;

S500, dismantle the old line.

Preferably, in step S100, the switch on the first tower is installed 2 meters below the conductor.

Preferably, the specific steps of changing the pole tower into a tension pole tower in step S200 are:

S210. Install insulated tensioners and wire clamps on both sides of the tower at the same time. After tightening the conductors on both sides of the tower at the same time, use insulated drain wires to connect the large and small sides of the tower, disconnect the conductors and fix the tail wires on the small side in the tension clamps of the newly installed tension insulator string; lengthen the insulated rope loops connected to the insulated tensioners and wire clamps on the large side of the tower by 0.5 to 1.5 meters; keep the insulated tensioners and wire clamps on the large side of the tower at a sufficient installation distance from the subsequent new wires during installation, and the old wires inside the wire clamps can be cut to 0.4 to 0.6 meters to ensure that the live wires do not squeeze the working space;

S220. Remove the conductor from the cross-arm insulator on the branch cross-arm of the tower and install it in the tension wire clamp of the large side main cross-arm tension insulator. Use the insulated wire tightener tool to tighten the conductor to control the sag to avoid the new conductor from crossing the original conductor. At this time, the new conductor is located below the original conductor and should be kept at a sufficient distance on the basis of good insulation shielding of the six conductors.

S230. Remove the branch crossarm on the pole tower, install lead wires on both sides of the switch and connect the lead wires to the conductors on the small side of the pole tower and the newly installed conductors on the large side.

Preferably, in step S220, the length of the insulating flat belt of the insulated tensioner on the large side of the tower needs to be ensured during installation so as to maintain a sufficiently safe distance from the subsequent newly installed wires. At the same time, the old wires on the inside of the tensioner are cut off to 0.5m to ensure that the live wires will not squeeze the working space.

Preferably, the specific steps of removing the old line in step S500 are:

S510, pull out the drop-out fuse on the pole tower corresponding to the first branch line pole tower on the migration line, and remove the small-side insulated drain wire, tensioner and original line at the first branch line pole tower;

S520, live removal of the insulated drain wire, tensioner and original line on the small side of the last tower;

S530, remove the insulated drain wire, tensioner and original line on the large side of the first tower under power.

S540. After completing the above steps, other old poles and lines on the migration line can be dismantled in a de-energized state.

Preferably, if a transformer is installed on a tower on the migration line, step S400 of low-voltage line migration is added after step S300, and the specific steps are:

S410, install low-voltage overhead lines on the new lines, and use live working methods to connect them to the original low-voltage overhead lines, and transfer the original low-voltage overhead line users one by one to the new low-voltage overhead lines, and disconnect them from the old low-voltage lines;

S420, use a mobile box transformer to temporarily draw power, connect the high-voltage cable to the new rack conductor, and connect the low-voltage cable to the new rack low-voltage line. After confirming that the low-voltage outlet switch of the mobile box transformer meets the synchronous grid connection conditions, close the low-voltage switch. At this time, the low-voltage load is supplied by the 4# pole transformer and the mobile box transformer at the same time;

S430, remove the high and low voltage outgoing wires on the tower of the transformer under power, and transfer the transformer to the corresponding tower on the new line, connect the high and low voltage outgoing wires on the transformer to the new high and low voltage lines, and check the phase of the low voltage switch of the transformer and close it;

S440, pull open the low-voltage side switch and high-voltage side switch of the mobile box transformer in sequence, and remove the high and low voltage cables under power. This step is completed.

Compared with the prior art, the advantages of the present invention are:

First, it can safely and effectively distinguish between live equipment and power-off equipment, ensure that new poles and lines are installed in a power-off state, put new poles and lines into operation and old poles and lines out of operation through live work, and also dismantle old poles and lines in a power-off state. At the same time, it does not affect the power supply of branch lines and ensures the normal operation of low-voltage lines.

Secondly, this method is different from conventional bypass operations that require the laying of a large number of bypass cables and other equipment. It uses new overhead lines made from local materials as a "bypass system" to complete the load transfer between the old and new poles. At the same time, it uses wire clamps to temporarily fix the conductors to ensure the distance between the new and old lines, avoiding phase-to-phase short-circuit accidents. As a result, the line relocation is completed and the devices on the poles and towers on the relocated lines remain basically unchanged, and the devices meet the standards.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Referring to FIG. 1, an embodiment of a method for relocating a pole line under uninterruptible power supply of the present invention is shown. The relocation line includes a first pole tower at the head and a last pole tower at the tail. The relocation line is also connected to a branch line. The pole tower on the branch line closest to the relocation line is the first branch line pole tower. The method for relocating a pole line under uninterruptible power supply includes the following steps:

S100. Erect the same number of poles and towers as the relocated line. First erect the poles and install the pole-mounted equipment without power. The equipment on the newly erected poles and towers should be consistent with the equipment on the corresponding poles and towers on the line to be relocated. Install switches on the first pole and the switch on the first pole should be installed 2 meters below the conductor. Install branch cross arms and straight insulators 1.5 meters below the conductor on the first pole, the last pole and the first branch pole to fix the conductor extending from the new pole.

S200, determining whether the pole tower is a tension pole tower, if yes, skipping this step, if no, changing the pole tower to a tension pole tower;

S210. Install insulated tensioners and wire clamps on both sides of the tower at the same time. After tightening the wires on both sides of the tower at the same time, use an insulated drain wire to connect the large and small sides of the tower (if it is an insulated wire, the insulation layer needs to be stripped off), disconnect the wire and fix the tail wire on the small side in the newly installed tension insulator string tension clamp; the insulated rope loop connected to the insulated tensioner and wire clamp on the large side of the tower is lengthened by 0.5 to 1.5 meters; the insulated tensioner and wire clamp on the large side of the tower should be installed as far out as possible to keep a sufficient installation distance from the subsequent new wires. At the same time, the old wire inside the wire clamp can be cut off to 0.4 to 0.6 meters, so as to ensure that the live wire will not squeeze the working space;

S220. Remove the conductor from the cross-arm insulator on the branch cross-arm of the tower and install it in the tension wire clamp of the large side main cross-arm tension insulator. Use the insulated wire tightener tool to tighten the conductor to control the sag to avoid the new conductor from crossing the original conductor. At this time, the new conductor is located below the original conductor and should be kept at a sufficient distance on the basis of good insulation shielding of the six conductors.

S230, remove the branch crossarm on the tower, install the lead wires on both sides of the switch and connect the lead wires to the small side conductor and the large side new frame conductor of the tower respectively;

S300, carry out live load transfer;

S310, use the lead wire as the tension pole jumper to connect the new wire of the end tower with the large side wire;

S320, use the lead wire as a tension pole jumper to connect the new wire of the first branch line tower with the large side wire under power, and check whether the phase is correct at the upper and lower piles of the drop-out fuse of the tower connecting the new line and the first branch line tower. If it is correct, close the drop-out fuse;

S330, check whether the phase is correct at the switch of the first tower, close the switch after confirming that it is correct, and measure whether the current shunting of the new line and the old line is normal at two points of the first tower and the first branch line tower, accounting for 1/4 to 3/4 of the total current;

S500, dismantling old lines:

S510, pull out the drop-out fuse on the pole tower corresponding to the first branch line pole tower on the migration line, and remove the small-side insulated drain wire, tensioner and original line at the first branch line pole tower;

S520, live removal of the insulated drain wire, tensioner and original line on the small side of the last tower;

S530, remove the insulated drain wire, tensioner and original line on the large side of the first tower under power.

S540. After completing the above steps, other old poles and lines on the migration line can be dismantled in a de-energized state.

If there is a transformer installed on a tower on the migration line, step S400 of low-voltage line migration is added after step S300. The specific steps are as follows:

S410, install low-voltage overhead lines on the new lines, and use live working methods to connect them to the original low-voltage overhead lines, and transfer the original low-voltage overhead line users one by one to the new low-voltage overhead lines, and disconnect them from the old low-voltage lines;

S420, use a mobile box transformer to temporarily draw power, connect the high-voltage cable to the new rack conductor, and connect the low-voltage cable to the new rack low-voltage line. After confirming that the low-voltage outlet switch of the mobile box transformer meets the synchronous grid connection conditions, close the low-voltage switch. At this time, the low-voltage load is supplied by the 4# pole transformer and the mobile box transformer at the same time;

S430, remove the high and low voltage outgoing wires on the tower of the transformer under power, and transfer the transformer to the corresponding tower on the new line, connect the high and low voltage outgoing wires on the transformer to the new high and low voltage lines, and check the phase of the low voltage switch of the transformer and close it;

S440, pull open the low-voltage side switch and high-voltage side switch of the mobile box transformer in sequence, and remove the high and low voltage cables under power. This step is completed.

The above scheme can be used to relocate poles and lines under uninterrupted power supply to safely and effectively distinguish between live equipment and power-off equipment, ensure that new poles and lines are installed under power outage conditions, put new poles and lines into operation and old poles and lines out of operation through live operations, and also remove old poles and lines under power outage conditions. At the same time, it does not affect the power supply of branch lines and ensures the normal operation of low-voltage lines. This method is different from conventional bypass operations that require the laying of a large number of bypass cables and other equipment. It uses local materials to lay new overhead lines as a "bypass system" to complete the load transfer work between the new and old poles and lines. At the same time, the wire clamp is used to temporarily fix the conductor to ensure the distance between the new line and the old line, avoiding phase-to-phase short circuit accidents, so that the line relocation is completed and the devices on the pole towers on the relocated line remain basically unchanged, and the devices meet the standards.

The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims (6)

1. A method for relocating a pole line under uninterruptible power supply, wherein the relocation line includes a first pole tower at the head and a last pole tower at the tail, and the relocation line is also connected to a branch line, and the pole tower on the branch line closest to the relocation line is a first branch line pole tower, characterized in that the method for relocating a pole line under uninterruptible power supply includes the following steps: S100. Erect the same number of pole towers as the relocated line, install switches on the first pole tower, and install branch cross arms and straight insulators under the conductors of the first pole tower, the last pole tower and the first branch line tower to fix the conductors extending from the new pole tower; S200, determining whether the pole tower is a tension pole tower, if yes, skipping this step, if no, changing the pole tower to a tension pole tower; S300, carry out live load transfer: S310, use the lead wire as a tension pole jumper to connect the new wire of the end tower with the large side wire; S320, use the lead wire as a tension pole jumper to connect the new wire of the first branch line tower with the large side wire, and check whether the phase is correct at the upper and lower piles of the drop-out fuse of the tower connecting the new line and the first branch line tower. If it is correct, close the drop-out fuse; S330, check whether the phase is correct at the switch of the first tower, close the switch after confirming that it is correct, and measure whether the current shunting of the new line and the old line is normal at two points of the first tower and the first branch line tower; S500, dismantle the old line. 2. A method for relocating poles and lines under uninterruptible power supply as described in claim 1, characterized in that in step S100, the switch on the first pole tower is installed 2 meters below the conductor. 3. The method for relocating poles under uninterruptible power supply as claimed in claim 1, characterized in that the specific steps of changing the pole tower into a tension pole tower in step S200 are: S210. Install insulated tensioners and wire clamps on both sides of the tower at the same time. After tightening the conductors on both sides of the tower at the same time, use insulated drain wires to connect the large and small sides of the tower, disconnect the conductors and fix the tail wires on the small side in the tension clamps of the newly installed tension insulator string; lengthen the insulated rope loops connected to the insulated tensioners and wire clamps on the large side of the tower by 0.5 to 1.5 meters; keep the insulated tensioners and wire clamps on the large side of the tower at a sufficient installation distance from the subsequent new wires during installation, and the old wires inside the wire clamps can be cut to 0.4 to 0.6 meters to ensure that the live wires do not squeeze the working space; S220. Remove the conductor from the cross-arm insulator on the branch cross-arm of the tower and install it in the tension wire clamp of the large side main cross-arm tension insulator. Use the insulation tensioner tool to tighten the conductor to control the sag to avoid the new conductor from crossing the original conductor. At this time, the new conductor is located below the original conductor and maintains a sufficient distance on the basis of insulation shielding of the six conductors. S230. Remove the branch crossarm on the pole tower, install lead wires on both sides of the switch and connect the lead wires to the conductors on the small side of the pole tower and the newly installed conductors on the large side. 4. A method for relocating poles and lines under uninterrupted power supply as described in claim 3, characterized in that in step S220, the length of the insulating flat belt of the wire tensioner on the large side of the pole tower must be ensured during installation so as to maintain a sufficiently safe distance from the subsequent newly installed wires, and at the same time, the old wires on the inner side of the wire gripper are cut off to 0.5m to ensure that the live wires will not squeeze the working space. 5. The method for relocating poles and lines under uninterrupted power supply as claimed in claim 1, wherein the specific steps of removing the old line in step S500 are: S510, pull out the drop-out fuse on the pole tower corresponding to the first branch line pole tower on the migration line, and remove the small-side insulated drain wire, tensioner and original line at the first branch line pole tower; S520, live removal of the insulated drain wire, tensioner and original line on the small side of the last tower; S530, remove the insulated drain wire, tensioner and original line on the large side of the first tower under power. S540. After completing the above steps, other old poles and lines on the migration line can be dismantled in a de-energized state. 6. A method for relocating poles and lines under uninterruptible power supply as claimed in claim 1, characterized in that if a transformer is installed on a pole tower on the relocation route, a step S400 of low-voltage line relocation is added after step S300, and the specific steps are: S410, install low-voltage overhead lines on the new lines, and use live working methods to connect them to the original low-voltage overhead lines, and transfer the original low-voltage overhead line users one by one to the new low-voltage overhead lines, and disconnect them from the old low-voltage lines; S420, use a mobile box transformer to temporarily draw power, connect the high-voltage cable to the new wire, and the low-voltage cable to the new low-voltage line. After confirming that the low-voltage outlet switch of the mobile box transformer has the conditions for synchronous grid connection, close the low-voltage switch. At this time, the low-voltage load is supplied by the 4# pole transformer and the mobile box transformer at the same time; S430, remove the high- and low-voltage side outlets of the transformer on the pole tower under power, and transfer the transformer to the corresponding pole tower on the new line, connect the high- and low-voltage side outlets of the transformer to the high- and low-voltage new lines, and check the phase at the low-voltage switch of the transformer and close the switch; S440, pull open the low-voltage side switch and high-voltage side switch of the mobile box transformer in sequence, and remove the high and low voltage cables under power. This step is completed.