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

Abstract

The invention discloses an operation method for transferring a rod wire under uninterrupted power supply, which comprises the following steps: s100, erecting towers with the same number as the migration lines beside the migration lines, installing switches on the first tower, and installing branch cross arms and linear insulators below the wires of the first tower, the last tower and the first branch tower to fix the wires extending from the new tower; s200, judging whether the tower is a tension-resistant tower, if so, skipping the step, and if not, changing the tower into the tension-resistant tower; s300, developing a charged transfer load: s500, removing the old line. The invention has the advantages that: the power supply of the branch line is not affected, the normal operation of the low-voltage line is ensured, the line migration and the change are completed, the device on the pole tower on the migration line is basically unchanged, and the device meets the standard.

Description

Operation method for transferring rod wire under uninterrupted power supply

Technical Field

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

Background

In the urban development and power grid construction processes, the conventional overhead line is required to be changed frequently, and particularly when the tower line is required to be changed in a small range due to factors such as road construction and municipal planning, the tower position and the line path are required to be changed, the tower shifting and line changing operation is completed under the condition that the 10kV distribution line and the 0.4kV low-voltage line at the lower part of the tower are not powered off, and no training teaching material or standard system is involved at present.

Disclosure of Invention

The invention aims to provide an operation method for transferring a pole wire under uninterrupted power supply, which can effectively avoid safety accidents caused by incorrect operation methods and insufficient safety measures, is suitable for various working conditions on site, and ensures that a clear safety interface exists between live construction and power failure construction by effectively separating live lines and power failure lines by using tools such as an insulating wire tightener, a movable box transformer, a bypass cable and the like, so that overhaul construction operation can be carried out safely and orderly on site.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the operation method of the migration pole line under uninterrupted power supply comprises the steps of:

s100, erecting towers with the same number as the migration lines beside the migration lines, installing switches on the first tower, and installing branch cross arms and linear insulators below the wires of the first tower, the last tower and the first branch tower to fix the wires extending from the new tower;

s200, judging whether the tower is a tension-resistant tower, if so, skipping the step, and if not, changing the tower into the tension-resistant tower;

s300, developing a charged transfer load:

s310, using a lead wire as a tension pole jumper wire to electrically lap a new frame wire of an end pole tower and a large-size side wire;

s320, using a lead wire as a tension pole jumper wire to electrically lap a new frame wire and a large-size side wire of the first branch pole tower, checking whether the phase is correct at the upper pile head and the lower pile head of a drop-out fuse of the pole tower, which is connected with the new frame wire and the first branch pole tower, and closing the drop-out fuse if the phase is correct;

s330, checking whether the phase is correct at the position of the first tower switch, closing the switch after confirming the phase is correct, and measuring whether the current diversion condition of the new line and the old line is normal at two points of the first tower and the first branch tower;

s500, removing the old line.

Preferably, in the step S100, the head pole switch is installed 2 meters below the wire.

Preferably, in the step S200, the concrete steps of changing the tower to a strain tower are as follows:

s210, simultaneously installing an insulating wire stretcher and a wire clamping device on two sides of a pole tower, simultaneously tightening wires on two sides of the pole tower, connecting a large side and a small side of the pole tower by using an insulating drainage wire, cutting off the wires, and fixing a tail wire on the small side in a newly-installed strain clamp of a strain insulator string; the length of the insulating rope sleeve connected with the insulating tightener and the wire clamping device at the large side of the tower is 0.5-1.5 m; when the pole tower large-size side insulation tightener wire clamping device is installed, a sufficient installation distance is kept between the pole tower large-size side insulation tightener wire clamping device and a subsequent new frame wire, and meanwhile, an old wire at the inner side of the wire clamping device can be cut to 0.4-0.6 m, so that the charged wire is ensured not to squeeze an operation space;

s220, removing wires on branch cross arms of the pole tower from a cross arm insulator, installing the wires in a strain clamp of a large-size side main cross arm strain insulator, and tightening the wires through an insulating tightener tool to control sag, so that the new frame wires and the original wires are prevented from crossing, and keeping a sufficient distance on the basis of insulating shielding of six wires when the new frame wires are positioned below the original wires;

s230, dismantling a branch cross arm on the pole tower, installing leads on two sides of the switch and respectively lapping the leads on a small-size side lead wire and a large-size side new frame lead wire of the pole tower.

Preferably, in step S220, the tower large-size side insulation tightener wire clamping device needs to ensure the length of the tightener insulation flat ribbon during installation so as to keep a sufficient safety distance with the subsequent new frame wires, and meanwhile, the old wires inside the wire clamping device are cut to 0.5m so as to ensure that the live wires cannot squeeze the working space.

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

s510, pulling a drop-out fuse on a tower corresponding to the first branch tower on the migration line, and removing a small-size side insulation drainage line, a wire tightener and an original line at the first branch tower;

s520, removing a small-sized side insulation drainage wire, a tightener and an original line of the tail pole tower in an electrified manner;

s530, removing the large-size side insulation drainage wire, the tightener and the original line of the head pole tower in an electrified manner.

S540, removing other old towers and circuits on the migration circuit in an uncharged state after the steps are completed.

Preferably, if a transformer is installed on a tower on the migration line, the low-voltage line migration in step S400 is added after step S300, which specifically includes the steps of:

s410, installing a low-voltage overhead line on the new overhead line, connecting the low-voltage overhead line with the original low-voltage overhead line in an electrified manner by adopting an electrified operation means, transferring outgoing subscribers of the original low-voltage overhead line to the new overhead line one by one, and disconnecting the low-voltage overhead line from the old low-voltage line in an electrified manner;

s420, temporarily taking electricity by using the mobile box transformer substation, connecting a high-voltage cable to a new frame wire, connecting the high-voltage cable to a new frame low-voltage wire, confirming that the low-voltage outlet switch of the mobile box transformer substation has synchronous grid connection conditions, and then closing the low-voltage switch, wherein at the moment, the low-voltage load is simultaneously supplied by a 4# rod transformer and the mobile box transformer substation;

s430, removing outgoing lines on the high and low voltage sides of the transformer on the pole tower in an electrified manner, transferring the transformer to a corresponding pole tower on a new line, overlapping the outgoing lines on the high and low voltage sides of the transformer to the new high and low voltage rack line, checking the phase of a low voltage switch of the transformer, and closing;

s440, sequentially pulling the low-voltage side switch and the high-voltage side switch of the movable box transformer substation, and removing the high-voltage cable and the low-voltage cable in an electrified manner, thereby completing the work.

Compared with the prior art, the invention has the advantages that:

firstly, can effectively distinguish electrified equipment and outage equipment safely, ensure to accomplish new pole line installation under the outage state, accomplish new pole line through live working and throw into operation and old pole line and withdraw from the operation, accomplish old pole line under the outage state likewise and demolish. Meanwhile, the power supply of the branch line is not influenced, and the normal operation of the low-voltage line is ensured.

The method is different from the conventional bypass operation in that a large number of bypass cables and other devices are required to be laid, the local material new overhead line is adopted as a bypass system to finish the load transfer work of the new and old pole lines, meanwhile, the way of temporarily fixing the wires by the wire clamping device is adopted to ensure the distance between the new overhead line and the old line, the occurrence of interphase short-circuit accidents is avoided, the line migration completion and the device on the pole tower on the migration line are basically kept unchanged, and the device meets the standard.

Drawings

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

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, in an embodiment of a method for operating a migration line under uninterrupted power supply according to the present invention, the migration line includes a head tower located at a head portion and a tail tower located at a tail portion, a branch line is further connected to the migration line, a tower closest to the migration line on the branch line is a first branch line tower, and the method for operating the migration line under uninterrupted power supply includes the following steps:

s100, erecting towers with the same number as the migration lines beside the migration lines, erecting the towers and installing on-column equipment under the condition of no electrification, wherein the equipment on the new upright towers is consistent with the corresponding on-tower equipment on the lines to be migrated; a switch is arranged on the first tower, the switch on the first tower is arranged at a position 2 m below the lead, and a branch cross arm and a linear insulator are arranged at a position 1.5m below the lead of the first tower, the tail tower and the first branch tower, so as to fix the lead extending from the new tower;

s200, judging whether the tower is a tension-resistant tower, if so, skipping the step, and if not, changing the tower into the tension-resistant tower;

s210, simultaneously installing an insulating wire stretcher and a wire clamping device on two sides of a pole tower, simultaneously tightening wires on two sides of the pole tower, connecting a large side and a small side of the pole tower by using an insulating drainage wire (if the wires are insulating wires, insulating layers need to be stripped), cutting off the wires, and fixing tail wires on the small side in a newly-installed strain clamp of a strain insulator string; the length of the insulating rope sleeve connected with the insulating tightener and the wire clamping device at the large side of the tower is 0.5-1.5 m; the large-sized side insulation tightener wire clamping device of the pole tower is arranged outside as far as possible so as to keep enough installation distance with the subsequent new frame wires, and meanwhile, the old wires on the inner side of the wire clamping device can be cut to 0.4-0.6 m, so that the charged wires can be ensured not to squeeze the operation space;

s220, removing wires on branch cross arms of the pole tower from a cross arm insulator, installing the wires in a strain clamp of a large-size side main cross arm strain insulator, and tightening the wires through an insulating tightener tool to control sag, so that the new frame wires and the original wires are prevented from crossing, and keeping a sufficient distance on the basis of insulating shielding of six wires when the new frame wires are positioned below the original wires;

s230, dismantling a branch cross arm on the pole tower, installing leads on two sides of the switch and respectively lapping the leads on a small-size side lead wire and a large-size side new frame lead wire of the pole tower;

s300, developing a charged transfer load;

s310, using a lead wire as a tension pole jumper wire to electrically lap a new frame wire of an end pole tower and a large-size side wire;

s320, using a lead wire as a tension pole jumper wire to electrically lap a new frame wire and a large-size side wire of the first branch pole tower, checking whether the phase is correct at the upper pile head and the lower pile head of a drop-out fuse of the pole tower, which is connected with the new frame wire and the first branch pole tower, and closing the drop-out fuse if the phase is correct;

s330, checking whether the phase is correct at the position of the first tower, closing the switch after confirming the phase is correct, and measuring whether the current split condition of the new line and the old line is normal at two points of the first tower and the first branch tower, wherein the current split condition accounts for 1/4-3/4 of the total current;

s500, removing the old line:

s510, pulling a drop-out fuse on a tower corresponding to the first branch tower on the migration line, and removing a small-size side insulation drainage line, a wire tightener and an original line at the first branch tower;

s520, removing a small-sized side insulation drainage wire, a tightener and an original line of the tail pole tower in an electrified manner;

s530, removing the large-size side insulation drainage wire, the tightener and the original line of the head pole tower in an electrified manner.

S540, removing other old towers and circuits on the migration circuit in an uncharged state after the steps are completed.

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

s410, installing a low-voltage overhead line on the new overhead line, connecting the low-voltage overhead line with the original low-voltage overhead line in an electrified manner by adopting an electrified operation means, transferring outgoing subscribers of the original low-voltage overhead line to the new overhead line one by one, and disconnecting the low-voltage overhead line from the old low-voltage line in an electrified manner;

s420, temporarily taking electricity by using the mobile box transformer substation, connecting a high-voltage cable to a new frame wire, connecting the high-voltage cable to a new frame low-voltage wire, confirming that the low-voltage outlet switch of the mobile box transformer substation has synchronous grid connection conditions, and then closing the low-voltage switch, wherein at the moment, the low-voltage load is simultaneously supplied by a 4# rod transformer and the mobile box transformer substation;

s430, removing outgoing lines on the high and low voltage sides of the transformer on the pole tower in an electrified manner, transferring the transformer to a corresponding pole tower on a new line, overlapping the outgoing lines on the high and low voltage sides of the transformer to the new high and low voltage rack line, checking the phase of a low voltage switch of the transformer, and closing;

s440, sequentially pulling the low-voltage side switch and the high-voltage side switch of the movable box transformer substation, and removing the high-voltage cable and the low-voltage cable in an electrified manner, thereby completing the work.

By adopting the scheme, the live equipment and the power failure equipment can be safely and effectively distinguished when the live equipment is in uninterrupted power supply and the operation of moving the pole wire is carried out, so that the installation of the new pole wire is ensured to be completed in the power failure state, the input operation of the new pole wire and the withdrawal operation of the old pole wire are completed through the live operation, and the dismantling of the old pole wire is also completed in the power failure state. Meanwhile, the power supply of the branch line is not influenced, and the normal operation of the low-voltage line is ensured. The method is different from the conventional bypass operation in that a large number of bypass cables and other devices are required to be laid, the load transfer work of the new and old pole lines is completed by adopting a local material new overhead line as a bypass system, meanwhile, the distance between the new overhead line and the old line is ensured by adopting a mode of temporarily fixing wires by a wire clamping device, the occurrence of inter-phase short-circuit accidents is avoided, and the devices on the pole towers on the line transfer completion and transfer line are basically unchanged and accord with the standard.

The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.

Claims (6)

1. The operation method of the migration pole line under uninterrupted power supply is characterized in that the operation method of the migration pole line under uninterrupted power supply comprises the following steps:

s100, erecting towers with the same number as the migration lines beside the migration lines, installing switches on the first tower, and installing branch cross arms and linear insulators below the wires of the first tower, the last tower and the first branch tower to fix the wires extending from the new tower;

s200, judging whether the tower is a tension-resistant tower, if so, skipping the step, and if not, changing the tower into the tension-resistant tower;

s300, developing a charged transfer load:

s310, using a lead wire as a tension pole jumper wire to electrically lap a new frame wire of an end pole tower and a large-size side wire; s320, using a lead wire as a tension pole jumper wire to electrically lap a new frame wire and a large-size side wire of the first branch pole tower, checking whether the phase is correct at the upper pile head and the lower pile head of a drop-out fuse of the pole tower, which is connected with the new frame wire and the first branch pole tower, and closing the drop-out fuse if the phase is correct;

s330, checking whether the phase is correct at the position of the first tower switch, closing the switch after confirming the phase is correct, and measuring whether the current diversion condition of the new line and the old line is normal at two points of the first tower and the first branch tower;

s500, removing the old line.

2. The method according to claim 1, wherein the head pole switch is installed 2 meters below the wire in step S100.

3. The method for transferring a pole line under uninterrupted power supply according to claim 1, wherein the step S200 of changing the pole tower to a tension-resistant pole tower comprises the following specific steps:

s210, simultaneously installing an insulating wire stretcher and a wire clamping device on two sides of a pole tower, simultaneously tightening wires on two sides of the pole tower, connecting a large side and a small side of the pole tower by using an insulating drainage wire, cutting off the wires, and fixing a tail wire on the small side in a newly-installed strain clamp of a strain insulator string; the length of the insulating rope sleeve connected with the insulating tightener and the wire clamping device at the large side of the tower is 0.5-1.5 m; when the pole tower large-size side insulation tightener wire clamping device is installed, a sufficient installation distance is kept between the pole tower large-size side insulation tightener wire clamping device and a subsequent new frame wire, and meanwhile, an old wire at the inner side of the wire clamping device can be cut to 0.4-0.6 m, so that the charged wire is ensured not to squeeze an operation space;

s220, removing wires on branch cross arms of the pole tower from the cross arm insulators, installing the wires in a strain clamp of a large-size side main cross arm strain insulator, tightening the wires through an insulating tightener tool to control sag, avoiding crossing of a new frame wire and an original wire, and keeping a sufficient distance on the basis of insulating and shielding of six wires when the new frame wire is positioned below the original wire;

s230, dismantling a branch cross arm on the pole tower, installing leads on two sides of the switch and respectively lapping the leads on a small-size side lead wire and a large-size side new frame lead wire of the pole tower.

4. A method according to claim 3, wherein in step S220, the tower large-side insulated wire-tightening device is installed to ensure the length of the insulated flat ribbon of the wire-tightening device so as to maintain a sufficient safety distance from the subsequent new wire, and the old wire inside the wire-tightening device is cut to 0.5m so as to ensure that the live wire does not squeeze the working space.

5. The method for migrating a line under uninterruptible power supply according to claim 1, wherein the specific steps of removing the old line in step S500 are as follows:

s510, pulling a drop-out fuse on a tower corresponding to the first branch tower on the migration line, and removing a small-size side insulation drainage line, a wire tightener and an original line at the first branch tower;

s520, removing a small-sized side insulation drainage wire, a tightener and an original line of the tail pole tower in an electrified manner;

s530, removing the large-size side insulation drainage wire, the tightener and the original line of the head pole tower in an electrified manner.

S540, removing other old towers and circuits on the migration circuit in an uncharged state after the steps are completed.

6. The method for transferring a pole line under uninterrupted power supply according to claim 1, wherein if a transformer is installed on a pole tower on the transfer line, the low voltage line transfer of step S400 is added after step S300, which comprises the following specific steps:

s410, installing a low-voltage overhead line on the new overhead line, connecting the low-voltage overhead line with the original low-voltage overhead line in an electrified manner by adopting an electrified operation means, transferring outgoing subscribers of the original low-voltage overhead line to the new overhead line one by one, and disconnecting the low-voltage overhead line from the old low-voltage line in an electrified manner;

s420, temporarily taking electricity by using the mobile box transformer substation, connecting a high-voltage cable to a new frame wire, connecting the high-voltage cable to a new frame low-voltage wire, confirming that the low-voltage outlet switch of the mobile box transformer substation has synchronous grid connection conditions, and then closing the low-voltage switch, wherein at the moment, the low-voltage load is simultaneously supplied by a 4# rod transformer and the mobile box transformer substation; s430, removing outgoing lines on the high and low voltage sides of the transformer on the pole tower in an electrified manner, transferring the transformer to a corresponding pole tower on a new line, overlapping the outgoing lines on the high and low voltage sides of the transformer to the new high and low voltage rack line, checking the phase of a low voltage switch of the transformer, and closing;

s440, sequentially pulling the low-voltage side switch and the high-voltage side switch of the movable box transformer substation, and removing the high-voltage cable and the low-voltage cable in an electrified manner, thereby completing the work.