CN102664358B - Live replacement method for static contact of 220 kV flexible busbar - Google Patents

Abstract

The invention relates to the field of GW6 series AC high-voltage isolating switches for soft busbars in 220kV substations of power grids, and in particular to a method for replacing static contacts of 220kV soft busbars with electricity. The equipotential method transfers the potential, and replaces the static contact of the flexible busbar with electricity, including the steps of disassembly and installation. Compared with the prior art, the beneficial effects of the present invention are: 1) The insulated ladder is used as an insulated manned platform, which meets the requirements of the equipotential operation method, is small in size, can be lifted and lowered under the soft bus, and is suitable for 220kV soft bus Live replacement of static contacts of GW6 series single-column and double-column vertical opening type disconnectors. 2) It promotes the progress of science and technology and has remarkable social and economic benefits. 3) It fills the blank of the live replacement project of the static contact of the isolating switch, and has broad application prospects and promotion value in the national grid system.

Description

The Method of Replacing Static Contacts of 220kV Soft Busbar with Electricity

technical field

The invention relates to the field of GW6 series AC high-voltage isolating switches for flexible buses in 220kV substations of a power grid, in particular to a method for replacing static contacts of 220kV flexible buses with electricity.

Background technique

GW6 series single-column and double-column vertical opening type disconnectors are generally installed under the overhead soft busbars of 220kV substations. They are used for maintenance and section isolation, switching lines according to needs, splitting and closing no-load lines, and automatic fast isolation. Isolation of the fracture, clear separation and closing state, and the advantages of inspection. In addition to saving the floor area, it can also reduce the lead wires and reduce the investment of the power station. Therefore, it is more common in domestic 220kV substations.

Substations in normal operation have two wiring methods: double busbar and single busbar. Due to the different wiring methods, when the moving contact of the disconnector or the static contact on the soft busbar has defects or hidden dangers, the handling methods are different.

When connecting double busbars, the operator of the substation can only take the method of inverting the busbars, switching the power load to another busbar or sending it by bypass. Since dozens to hundreds of operations need to be done, the procedures are complicated and misoperation accidents are prone to occur , increasing the probability of operating personnel safety risks.

In the case of single-bus connection, substation operators can only use the bypass to deliver. Since the distance between the moving contact of the switch and the static contact of the soft bus is only 2.56 meters, the safety distance between the crane and the soft bus is lower than the standard of electric safety regulations, the crane cannot be hoisted, and the maintenance personnel cannot perform maintenance work. The 220kV single bus of the substation Repair or replacement can only be done if all the power is cut off, which affects the reliability of the system's safe power supply.

Contents of the invention

The purpose of the present invention is to provide a method for replacing the static contacts of 220kV soft busbar with electricity, which overcomes the deficiencies of the prior art, uses a special insulating ladder, adopts the equipotential method and cooperates with the ground electrician, and electrifies the overhead soft busbar Remove and install static contacts, eliminate defects or hidden dangers, reduce power outages and switching operations by operating personnel, ensure the reliability of power grid power supply, and ensure the safe operation of electrical equipment.

In order to solve the problems of the technologies described above, the technical solution of the present invention is:

The method for replacing the static contact of the 220kV soft busbar with electricity is characterized in that the operator ascends to the bottom of the soft busbar along the insulating ladder, uses the equipotential method to transfer the potential, and replaces the static contact of the soft busbar with electricity, including disassembly steps and installation steps, The specific operation steps are as follows:

1. Disassembly steps:

1) Preparations before lifting the insulated ladder: first hang a closed tackle on the top of the insulated ladder, and thread an insulating protective rope on the locked tackle; set two insulating control ropes at both ends of the ladder head; Three open-distance control ropes are arranged from top to bottom between the two sides of the ladder, and an appropriate length is reserved. One end of the open-distance control rope is tied to one side of the ladder body, and the other end of the open-distance control rope is tied to the other side of the ladder body. The ladder bodies on both sides are respectively provided with two insulated traction ropes to prevent the waist of the ladder body from collapsing; a ladder foot holder is installed on the ladder foot of one side of the ladder body, and the ladder foot holder is nailed to the ground;

2) Hoisting of the insulating ladder: Under the command of the person in charge and the supervision of the responsible guardian, divide the ground electricians on one side of the ladder body into two groups, each group pulls an insulating traction rope, and a ground electrician on the other side of the ladder body The electrician pulls the insulating protective rope to prevent the ladder from falling due to excessive lifting; two ground electricians step on the ladder foot holder with their feet, and lift with both hands until the insulating herringbone ladder stands upright on the ground in a herringbone shape;

3) Put the insulating ladder in place: Under the condition that four ground electricians hold the insulating control rope respectively, take off the ladder foot holder; the ground electricians are divided into two groups to move the insulating ladder to the first operation point smoothly (On the side of the running circuit at the same gear), the ladder head is 1.6-0.8m higher than the soft busbar, and the soft busbar is 100-150mm away from the ladder body;

4) Fix the insulated herringbone ladder: tighten the insulating control ropes at both ends of the ladder head along the direction of the extension lines on both sides of the ladder head, and use a tensioner on at least one of the insulating control ropes on one side to make the rope tension The force is not less than 1KN;

Tighten the insulated traction ropes on both sides of the ladder body, and tie them to the ground anchors respectively, so that the ladder bodies on both sides protrude slightly outward;

5) Preparations before climbing the ladder: the equipotential electrician wears a full set of qualified shielding clothing and goggles, and the dedicated guardian checks whether the appearance of the shielding clothing is good, whether the connections of each part are reliable, and whether the protective rope buckle is correct. After passing the qualification, he is allowed to climb the ladder;

6) Ladder climbing operation: two ground electricians each support one side of the ladder body, the other two ground electricians pull the insulating protection rope, and the equipotential electrician climbs the ladder along one side of the ladder body. During the climbing process, ensure that the combined gap is greater than 2.1m If the distance is greater than 2.5m, fasten the three distance control ropes one by one until the working position, fasten the safety belt, transfer the potential, and enter the strong electric field. The exposed parts of the human body should keep a safe distance of 0.3m, and the equipotential electrician will shield The line is hung between the soft busbar and the shielding suit to ensure that the equipotential is always maintained when the hands are away from the charged body;

7) Fix the soft busbar: the equipotential electrician installs two sets of wire fixing arms on one side of the ladder, so that the soft busbar is held up by the wire fixing arm, and the soft busbar is bound on the wire fixing arm with copper wires to prevent the soft busbar from swinging;

8) Remove the static contact: Hang the arc-suppression tackle on the soft busbar, pass one end of the arc-suppression rope through the pulley of the arc-suppression tackle and tie it to the bottom of the T-shaped clamp on the side of the static contact, so that the static contact has a gap of no less than 100mm The tail of the arc-suppression rope is controlled by a ground electrician; on the step slightly higher than the soft busbar, a locking tackle is tied with a non-polar rope sleeve, and one end of the insulating rope passes through the pulley of the locking tackle and is tied to the static contact. At the bottom of the T-shaped clamp on one side, the tail of the insulating rope is controlled by a ground electrician; a drop control insulating rope is tied on the static contact, and the tail of the falling control insulating rope is controlled by another ground electrician;

The equipotential electrician first removes the bolts on one side of the T-shaped clamp of the static contact, and then removes the bolts on the other side. During the operation, the two ground electricians who control the ends of the arc suppression rope and the insulating rope cooperate with the tensioning rope tail;

9) Lower the static contact: Under the command of the person in charge of the work, two ground electricians control the arc suppression rope and the insulating rope to loosen the rope respectively, and the other ground electrician controls the falling and controls the angle of the insulating rope to make the static contact separate from the soft busbar slowly fall to the ground;

10) Exit at the end of the operation: the equipotential electrician removes the aluminum wrapping cloth wrapped around the soft busbar, opens the copper wire fixed on the soft busbar on the wire fixing arm, and with the permission of the person in charge, the equipotential electrician removes the shielding equalizing line and transfers Potential, exit the equipotential state, keep a safe distance of 0.3m from the exposed parts of the human body, open the seat belt, and return to the ground along the ladder;

11) Transfer the insulating ladder: open all the ropes that fix the ladder body, and move the whole ladder to the outside of the soft busbar for 1m, then control the ropes on the ladder body to make the insulating ladder fall slowly. When the ladder head is lower than the soft busbar 0.5 When it is more than m, two groups of ground electricians move the insulating ladder from the bottom of the soft busbar to the next operation point, and repeat steps 1) to 10) to remove the static contact when it is live;

12) Repeat steps 1) to 11) in the disassembly steps until all the static contacts on the three-phase flexible busbar are disassembled;

2. Installation steps:

1) Preparations before lifting the insulated ladder: first hang a closed tackle on the top of the insulated ladder, and thread an insulating protective rope on the locked tackle; set two insulating control ropes at both ends of the ladder head; Three open-distance control ropes are arranged from top to bottom between the two sides of the ladder, and an appropriate length is reserved. One end of the open-distance control rope is tied to one side of the ladder body, and the other end of the open-distance control rope is tied to the other side of the ladder body. Tight; two ladder bodies on both sides are respectively provided with two insulated traction ropes to prevent the waist of the ladder body from collapsing; a ladder foot holder is installed on the ladder foot of one side of the ladder body, and the ladder foot holder is nailed to the ground; The cross-arm bases are respectively installed on both sides of the ladder at -80cm, and the cross-arms are movably connected with the cross-arm bases;

2) Hoisting of the insulating ladder: Under the command of the person in charge and the supervision of the responsible guardian, divide the ground electricians on one side of the ladder body into two groups, each group pulls an insulating traction rope, and a ground electrician on the other side of the ladder body The electrician pulls the insulating protection rope to prevent the ladder from falling due to over-lifting; two ground electricians step on the ladder foot holder with their feet, and lift with both hands until the insulated herringbone ladder stands upright on the ground in a herringbone shape;

3) Put the insulating ladder in place: Under the condition that four ground electricians hold the insulating control rope respectively, take off the ladder foot holder; the ground electricians are divided into two groups to move the insulating ladder to the first operation point smoothly (On the side of the running circuit at the same gear), the ladder head is 1.6-0.8m higher than the soft busbar, and the soft busbar is 100-150mm away from the ladder body;

4) Fix the insulated herringbone ladder: tighten the insulating control ropes at both ends of the ladder head along the direction of the extension lines on both sides of the ladder head, and use a tensioner on at least one of the insulating control ropes on one side to make the rope tension The force is not less than 1KN; tighten the insulated traction ropes on both sides of the ladder body, and tie them to the ground anchors respectively, so that the ladder body on both sides protrudes slightly outward;

5) Preparations before climbing the ladder: the equipotential electrician wears a full set of qualified shielding clothing and goggles, and the dedicated guardian checks whether the appearance of the shielding clothing is good, whether the connections of each part are reliable, and whether the protective rope buckle is correct. After passing the qualification, he is allowed to climb the ladder;

6) Ladder climbing operation: two ground electricians each support one side of the ladder body, the other two ground electricians pull the insulating protection rope, and the equipotential electrician climbs the ladder along one side of the ladder body. During the climbing process, ensure that the combined gap is greater than 2.1m If the distance is greater than 2.5m, fasten the three distance control ropes one by one until the working position, fasten the safety belt, transfer the potential, and enter the strong electric field. The exposed parts of the human body should keep a safe distance of 0.3m, and the equipotential electrician will shield The line is hung between the soft busbar and the shielding suit to ensure that the equipotential is always maintained when the hands are away from the charged body;

7) Fix the soft busbar: the equipotential electrician installs two sets of wire fixing arms on one side of the ladder, so that the soft busbar is held up by the wire fixing arm, and the soft busbar is bound on the wire fixing arm with copper binding wires to prevent the soft busbar from swinging; The equipotential electrician puts the insulating small holding pole on the slot shoulder and binds it with insulating rope, and the tail of the insulating small holding pole is tied with the insulating rope and the ladder, so that the fixed hanging ring at the end of the insulating small holding pole is placed outside the soft busbar , the movable hanging ring on the insulating small pole is located inside the soft busbar, and the distance between the two hanging rings should be slightly larger than the width of the new static contact;

8) Preparations before the installation of the new static contact: the equipotential electrician hangs the locking block in the fixed hanging ring at the end of the small insulating pole, and inserts an arc-suppressing rope into the movable hanging ring on the small insulating pole. An arc suppression line is connected between the arc suppression tackle and the soft busbar; a ground electrician hangs the metal hook of the measuring ruler on the insulating rod on the soft busbar, the tail of the measuring ruler is placed on the ground, and the middle part of the measuring ruler is placed in the middle of the dumbbell-shaped moving contact, forming a three-dimensional Point a line, find the central hanging point of the static contact of the soft busbar, and the equipotential electrician uses a marker to mark the width of the contact part between the static contact and the soft busbar, and then uses a steel wire brush within the width of the mark to clean the wires evenly. Apply neutral Vaseline;

The ground electrician removes the paint and dirt on the assembled static contact connecting plate and parallel ditch clamps, applies neutral Vaseline, lifts it to the bottom of the work site, and ties the insulation on the small insulating pole according to the size of the static contact. At the end of the pull rope and the arc suppression rope, tie a lifting control rope at the bottom of the static contact;

9) Install the static contact: Under the command of the person in charge of the work, two ground electricians pull the ends of the insulating pull rope and the arc suppression rope respectively, and one ground electrician pulls the lifting control rope to make the static contact slowly approach the soft For the busbar, the equipotential electrician turns his head to the opposite side of the arc to avoid high-temperature burns caused by the arc;

When the static contact stops stably at 50-60mm below the soft busbar, the equipotential electrician removes the bolts of the parallel groove clamp on the static contact connecting plate, buckles the upper part of the parallel groove clamp on the soft busbar, and the two ground electricians continue Lift the static contact, stop lifting when the lower part of the parallel groove line clamp on the static contact plate is connected with the upper part, the equipotential electrician installs the parallel groove line clamp bolt, and the ground electrician checks the soft busbar static contact with an insulating rod measuring ruler After the center meets the standard, the equipotential electrician tightens the bolts of the parallel trench clamp;

10) Exit at the end of the operation: the equipotential electrician removes the lifting control rope, arc suppression rope and insulating pull rope bound on the static contact; removes the two sets of wire fixing arms; with the permission of the person in charge, the equipotential electrician removes the shielded voltage equalizing line , transfer the potential, exit the equipotential state, keep the exposed part of the human body at a safe distance of 0.3m, open the seat belt, and return to the ground along the ladder passage;

11) Transfer the insulating ladder: open all the ropes that fix the ladder body, and move the whole ladder to the outside of the soft busbar for 1m, then control the ropes on the ladder body to make the insulating ladder fall slowly. When the ladder head is lower than the soft busbar 0.5 When it is above m, two groups of ground electricians move the insulating ladder from the bottom of the soft busbar to the next operating point, and repeat steps 1) to 10) to remove the static contact while it is live;

12) Repeat steps 1) to 11) in the installation steps until all the static contacts on the three-phase soft bus are disassembled.

Compared with prior art, the beneficial effect of the present invention is:

1) With the help of an insulating ladder as an insulating manned platform, it meets the requirements of the equipotential operation method. It is small in size and can be lifted and lowered under the soft busbar. It is suitable for the static contact of single-column and double-column vertical opening type disconnectors of 220kV soft busbar GW6 series The live replacement operation of the head.

2) Avoid busbar failures caused by static contact heating, burning, aging and other problems; create conditions for formulating equipment maintenance plans, improve live maintenance items; reduce the number of switching operations of operators, and prevent accidents caused by misoperation Power grid accidents, reducing the number of power outages and power outage time.

3) It promotes scientific and technological progress, improves the reliability of power supply, eliminates hidden dangers in production safety, and ensures safe power supply, which has significant social and economic benefits.

4) It fills the blank of the static contact of 220kV soft busbar GW6 series isolating switch, live removal and installation projects, and has broad application prospects and promotion value in the national grid system.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the working state of the embodiment of the insulating ladder of the present invention;

FIG. 2 is a side view of FIG. 1 .

In the figure: 1-ladder head 2-ladder body 3-ladder column 4-ladder 5-hanging lug 6-insulation control rope 7-locking tackle 8-insulation protection rope 9-wire fixing arm 10-spacing control rope 11 -Insulated traction rope 12-Ground anchor 13-Cross arm base 14-Cross arm 15-Insulated small pole 16-Fixed hanging ring 17-Active hanging ring

Detailed ways

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

See Figure 1 and Figure 2, which are schematic diagrams of the working state structure of the embodiment of the insulating ladder of the present invention, including a ladder head 1 and two ladder bodies 2 composed of ladder columns 3 and steps 4, and the length of the ladder columns 3 is 10.5-12.5 Two ends of the ladder head 1 are respectively provided with lifting lugs 5, and each lifting lug 5 is tied with two insulating control ropes 6, and the locking block 7 is hung on one of the lifting lugs 5, and a pulley of the locking block is threaded on the pulley. Insulated protective rope 8; one side of the ladder body is provided with a wire fixing arm 9, and the wire fixing arm 9 is 1.6-0.8m away from the ladder head; three distance control ropes 10 are set between the two ladder bodies 2 from top to bottom; two ladders Body outside is provided with respectively two insulation traction ropes 11 of anti-ladder body collapse waist, and the rope tail of insulation control rope 6 and insulation traction rope 11 links to each other with ground anchor 12 respectively.

The same sides of the two ladder bodies 2 are respectively provided with a cross arm base 13, and the cross arm 14 is respectively connected with the two cross arm bases 13, and the cross arm 14 is located at a distance of 40-80 cm from the ladder head. Insulated small holding rods 15 are provided between the steps, so that the head of the insulating small holding rods 15 is tilted toward the operating side, the end of the insulating small holding rods 15 is provided with a fixed hanging ring 16, and the middle section of the insulating small holding rods is provided with a movable hanging Ring 17.

During the operation of the method for replacing the static contact of the 220kV soft busbar with electricity, the operator ascends to the bottom of the soft busbar along the insulating ladder, uses the equipotential method to transfer the potential, and replaces the static contact of the soft busbar with electricity, including the steps of disassembly and installation. The specific operation steps are as follows:

1. Disassembly steps:

1) Preparations before lifting the insulated ladder: first hang a closed tackle on the top of the insulated ladder, and thread an insulating protection rope on the locked tackle; set two insulating control ropes at both ends of the ladder head, of which Two are pulled outwards in a figure-eight shape, and the other two are pulled outwards after crossing in an X-shape; between the ladder bodies on both sides from top to bottom (3m, 6m, and 9m away from the ladder head) There are three distance control ropes, reserve a suitable length, one end of the distance control rope is tied with a slipknot on one side of the ladder body, and the other end of the distance control rope is fastened to the other side of the ladder body; There are two insulated traction ropes at the waist, 3m and 6m away from the ladder head respectively. In order to ensure uniform force, the two ends of an insulated traction rope are respectively tied to the ladder columns on both sides to pull the middle section; Set the ladder foot holder on the ladder foot of the body, and nail the ladder foot holder to the ground;

2) Hoisting of the insulating ladder: Under the command of the person in charge and the supervision of the responsible guardian, divide the ground electricians on one side of the ladder body into two groups, each group pulls an insulating traction rope, and a ground electrician on the other side of the ladder body The electrician pulls the insulating protection rope to prevent the ladder from falling due to over-lifting; two ground electricians step on the ladder foot holder with their feet, and lift with both hands until the insulated herringbone ladder stands upright on the ground in a herringbone shape;

3) Put the insulating ladder in place: Under the condition that four ground electricians hold the insulating control rope respectively, take off the ladder foot holder; the ground electricians are divided into two groups to move the insulating ladder to the first operation point smoothly (On the side of the running circuit at the same gear), the ladder head is 1.6-0.8m higher than the soft busbar (due to the difference in phase and latitude), and the soft busbar is 100-150mm away from the ladder body; during the movement, the personnel must concentrate and move horizontally The movement should not be too large, follow the unified command of the person in charge of the work, and it is strictly forbidden for the ladder body to touch the busbar, reverse the ladder, and damage the surrounding operating equipment to prevent busbar failure;

4) Fixed insulating herringbone ladder: fix the ladder feet on the cement column of the isolation switch, and tighten the insulating control ropes at both ends of the ladder head along the direction of the extension lines on both sides of the ladder head and fix them on the fixed object or the ground anchor. Use a wire tensioner on at least one rope on one side to make the tension of the rope not less than 1KN; tighten the insulated traction ropes on both sides of the ladder body, and tie them to the ground anchors respectively, so that the ladder bodies on both sides are slightly It is advisable to protrude on the outside, and all remaining insulating ropes should be placed in special pockets to prevent dirt and moisture from reducing the insulation strength;

5) Preparations before climbing the ladder: the equipotential electrician wears a full set of qualified shielding clothing and goggles, and the dedicated guardian checks whether the appearance of the shielding clothing is good, whether the connections of each part are reliable, and whether the protective rope buckle is correct. After passing the qualification, he is allowed to climb the ladder;

6) Ladder climbing operation: two ground electricians each support one side of the ladder body, the other two ground electricians pull the insulating protection rope, and the equipotential electrician climbs the ladder along one side of the ladder body. During the climbing process, ensure that the combined gap is greater than 2.1m If the distance is greater than 2.5m, fasten the three distance control ropes one by one until the working position, fasten the safety belt, transfer the potential, and enter the strong electric field. The exposed parts of the human body should keep a safe distance of 0.3m, and the equipotential electrician will shield The line is hung between the soft busbar and the shielding suit to ensure that the equipotential is always maintained even when the hands are away from the charged body. Before the equipotential electrician is not fastened with a seat belt, the two ground electricians always pull the insulating protection rope to protect etc. Potential electrician safety climbing ladder;

7) Fix the soft busbar: the equipotential electrician installs two sets of wire fixing arms on one side of the ladder, so that the soft busbar is held up by the wire fixing arm, and the soft busbar is bound on the wire fixing arm with a 400-450mm long 2.5 ² copper wire. The number of winding and binding circles shall not be less than 3 to prevent the soft busbar from swinging;

8) Remove the static contact: Hang the arc-suppression tackle on the soft busbar, pass one end of the arc-suppression rope through the pulley of the arc-suppression tackle and tie it to the bottom of the T-shaped clamp on the side of the static contact, so that the static contact has a gap of no less than 100mm The tail of the arc-suppression rope is controlled by a ground electrician; on the step slightly higher than the soft bus bar, a locking tackle is hung with a non-polar rope sleeve, and one end of the insulated traction rope passes through the pulley of the locking tackle and is tied to the static At the bottom of the T-shaped clamp on the other side of the contact, the tail of the insulated traction rope is controlled by a ground electrician; another drop control insulating rope is tied on the static contact, and the tail of the fall control insulating rope is controlled by another ground electrician;

The equipotential electrician first removes the φ12mm bolt on one side of the T-shaped clamp of the static contact, and then removes the bolt on the other side; tight rope;

If there is a busbar grounding knife drain wire in the static contact circuit of the soft busbar, first remove the drain wire according to the 220kV Live Disconnection Standardization Work Guide issued by the provincial company, and carry out dangerous point analysis and safety control measures, which will not be done here Explain.

9) Lower the static contact: Under the command of the person in charge of the work, the equipotential electrician should turn his head to the opposite side of the arc to avoid high-temperature burns caused by the arc. Two ground electricians control the arc suppression rope and the insulating rope to loosen the rope respectively. , a ground electrician controls the falling of the static contact and controls the insulating rope, so that the static contact is separated from the soft busbar and slowly falls to the ground, so as to avoid the static contact hitting the moving contact of the isolation switch and the insulating support column, resulting in equipment damage;

10) Exit at the end of the operation: the equipotential electrician removes the aluminum wrapping cloth wrapped around the soft busbar, opens the copper wire fixed on the soft busbar on the wire fixing arm, and with the permission of the person in charge, the equipotential electrician removes the shielding equalizing line and transfers Potential, exit the equipotential state, keep a safe distance of 0.3m from the exposed parts of the human body, open the seat belt, and return to the ground along the ladder;

11) Transfer the insulating ladder: open all the ropes that fix the ladder body, and move the whole ladder to the outside of the soft busbar for 1m, then control the ropes on the ladder body to make the insulating ladder fall slowly. When the ladder head is lower than the soft busbar 0.5 When it is more than m, two groups of ground electricians lift the ladder with one group of three people, and the other group does not move at the same place, and moves alternately to move the insulating ladder from the bottom of the soft busbar to the next operating point, repeating steps 1) to 10) Remove the static contacts while live, and stop working immediately if there is a danger of personal injury or equipment. The distance control rope of the long ladder body increases the angle of the ladder body, spans the laid cable trench, and places the insulated herringbone ladder at the best working position;

12) Repeat steps 1) to 11) in the disassembly steps until all the static contacts on the three-phase soft bus are disassembled, and then the electric maintenance personnel can start other work.

2. Installation steps:

1) Preparations before lifting the insulated ladder: first hang a closed tackle on the top of the insulated ladder, and thread an insulating protection rope on the locked tackle; set two insulating control ropes at both ends of the ladder head, of which Two are pulled outwards in a figure-eight shape, and the other two are pulled outwards after crossing in an X-shape; between the ladder bodies on both sides from top to bottom (3m, 6m, and 9m away from the ladder head) There are three distance control ropes, reserve a suitable length, one end of the distance control rope is tied with a slipknot on one side of the ladder body, and the other end of the distance control rope is fastened to the other side of the ladder body; There are two insulated traction ropes at the waist, 3m and 6m away from the ladder head respectively. In order to ensure uniform force, the two ends of an insulated traction rope are respectively tied to the ladder columns on both sides to pull the middle section; Set the ladder foot holder on the ladder foot of the ladder body, and nail the ladder foot holder underground; install the cross-arm base on the ladder body on both sides at a distance of 40-80cm from the ladder head, and the cross-arm and the cross-arm base are flexibly connected. The screws on the cross-arm base are not tightened, keep the screw freely sliding in the cross-arm slot;

2) Hoisting of the insulating ladder: Under the command of the person in charge and the supervision of the responsible guardian, divide the ground electricians on one side of the ladder body into two groups, each group pulls an insulating traction rope, and a ground electrician on the other side of the ladder body The electrician pulls the insulating protection rope to prevent the ladder from falling due to over-lifting; two ground electricians step on the ladder foot holder with their feet, and lift with both hands until the insulated herringbone ladder stands upright on the ground in a herringbone shape;

3) Put the insulating ladder in place: Under the condition that four ground electricians hold the insulating control rope respectively, take off the ladder foot holder; the ground electricians are divided into two groups, three people in each group, and the insulating ladder is alternately and smoothly Transfer to the first operation point (running circuit side of the same gear), the ladder head is 1.6-0.8m higher than the soft busbar (due to the difference in phase and latitude), the soft busbar is 100-150mm away from the ladder body; The insulating rope is fixed on the cement column of the isolation switch; during the movement, the personnel must concentrate on the movement, and the horizontal movement should not be too large, and follow the unified command of the person in charge of the work. Failure occurs.

4) Fix the insulated herringbone ladder: tighten the insulation control ropes at both ends of the ladder head along the direction of the extension lines on both sides of the ladder head, and use a wire tightener on at least one of the insulation control ropes on one side, and check the wire tensioner Whether the fixed position of the circlip is correct, so that the tension of the rope is not less than 1KN; tighten the insulated traction ropes on both sides of the ladder body, and tie them to the ground anchors respectively, so that the ladder body on both sides protrudes slightly to the outside. When people go up, the ladder collapses at the waist, and all the remaining insulating rope ends are placed in special pockets to prevent dirt and moisture from reducing the insulation strength;

5) Preparations before climbing the ladder: the equipotential electrician wears a full set of qualified shielding clothing and goggles, and the dedicated guardian checks whether the appearance of the shielding clothing is good, whether the connections of each part are reliable, and whether the protective rope buckle is correct. After passing the qualification, he is allowed to climb the ladder;

6) Ladder climbing operation: two ground electricians each support one side of the ladder body, the other two ground electricians pull the insulating protection rope, and the equipotential electrician climbs the ladder along one side of the ladder body. During the climbing process, ensure that the combined gap is greater than 2.1m If the distance is greater than 2.5m, fasten the three distance control ropes one by one until the working position, fasten the safety belt, transfer the potential, and enter the strong electric field. The exposed parts of the human body should keep a safe distance of 0.3m, and the equipotential electrician will shield The line is hung between the soft busbar and the shielding suit to ensure that the equipotential is always maintained even when the hands are away from the charged body. Before the equipotential electrician is not fastened with a seat belt, the two ground electricians always pull the insulating protection rope to protect etc. The safety of potential electricians on ladders;

7) Fix the soft busbar: the equipotential electrician installs two sets of wire fixing arms on one side of the ladder, so that the soft busbar is held up by the wire fixing arm, and the soft busbar is tied to the wire fixing arm with a 400-450mm long 2.5 ² copper binding wire The number of winding and binding circles shall not be less than 3 to prevent the soft busbar from swinging; the equipotential electrician shall place the insulating small holding pole on the groove shoulder and tie it up with an insulating rope, and the tail of the insulating small holding pole shall be tied up with the ladder with an insulating rope , the rod head is slightly higher than the rod tail, so that the fixed hanging ring at the end of the insulating small holding rod is placed 50mm outside the soft busbar, and the movable hanging ring on the insulating small holding rod is located 50mm inside the soft busbar, and the distance between the two hanging rings is about It is advisable to be larger than the width of the new static contact;

8) Preparations before the installation of the new static contact: the equipotential electrician hangs the locking pulley in the fixed hanging ring at the end of the small insulating pole. The arc-suppression block is hung in the movable hanging ring on the pole, and both ends of the arc-suppression rope passing through the pulley are in the ground tool pocket, and an arc-suppression block is connected to the soft busbar; a ground electrician measures the insulating rod The metal hook of the ruler is hung on the soft busbar, the tail of the measuring ruler is placed on the ground, and the middle part of the measuring ruler is placed in the middle of the dumbbell-shaped moving contact to form a three-point line. Find the center hanging point of the static contact of the soft busbar. It is a mark for equipotential electricians After marking the width of the contact part between the static contact and the soft bus bar with a pen, use a steel wire brush to clean the wire within the width of the mark, and evenly coat the neutral Vaseline;

The ground electrician removes the paint and dirt on the assembled static contact connecting plate and the ditch clamp, applies neutral Vaseline, lifts it to the bottom of the work site, and fastens the small insulating poles hanging down according to the size of the static contact. Insulated pull rope and arc suppression rope head, and a lifting control rope tied to the static contact;

9) Install the static contact: Under the command of the person in charge of the work, two ground electricians pull the ends of the insulating pull rope and the arc suppression rope respectively, and one ground electrician pulls the lifting control rope to make the static contact cross the ground vertically The open disconnector slowly approaches the soft busbar to avoid the static contact hitting the movable contact of the disconnector and the insulating support column, resulting in equipment damage. The equipotential electrician turns his head to the opposite side of the arc to avoid high-temperature burns caused by the arc;

When the static contact stops stably at 50-60mm below the soft busbar, the equipotential electrician removes the bolts of the parallel groove clamp on the static contact connecting plate, buckles the upper part of the parallel groove clamp on the soft busbar, and the two ground electricians continue Lift the static contact, stop lifting when the lower part of the parallel groove line clamp on the static contact plate is connected with the upper part, the equipotential electrician installs the parallel groove line clamp bolt, and the ground electrician checks the soft busbar static contact with an insulating rod measuring ruler After the center meets the standard, the equipotential electrician tightens the bolts of the parallel trench clamp;

10) Exit at the end of the operation: the equipotential electrician removes the lifting control rope, arc suppression rope and insulating pull rope bound on the static contact; removes the two sets of wire fixing arms; with the permission of the person in charge, the equipotential electrician removes the shielded voltage equalizing line , transfer the potential, exit the equipotential state, keep the exposed part of the human body at a safe distance of 0.3m, open the seat belt, and return to the ground along the ladder passage;

11) Transfer the insulating ladder: open all the ropes that fix the ladder body, and move the whole ladder to the outside of the soft busbar for 1m, then control the ropes on the ladder body to make the insulating ladder fall slowly. When the ladder head is lower than the soft busbar 0.5 When it is above m, two groups of ground electricians move the insulating ladder from the bottom of the soft busbar to the next operating point, and repeat steps 1) to 10) to remove the static contact while it is live;

12) Repeat steps 1) to 11) in the installation steps until all the static contacts on the three-phase flexible busbar are disassembled. The person handles the work ticket and ends the work.

Claims (1)

1. the method for the soft bus static contact of charged for replacement 220kV, is characterized in that, operating personnel rises under soft bus along insulation double ladder, adopt idiostatic method to shift current potential, the soft bus static contact of charged for replacement, comprises demounting procedure and installation steps, and concrete operation step is as follows:

One, demounting procedure:

1) insulation double ladder is prepared before promoting: first at an enclosed type coaster of insulation double ladder top hanging, wear a bar insulation protection rope on enclosed type coaster; At a ladder two ends, two of insulation tricing lines are respectively set respectively; Between the ladder body of both sides, from top to bottom arrange and open apart from three of tricing lines, reserved appropriate length, opening apart from one end and the side ladder body of tricing line is slip-knot, opens apart from the other end and the opposite side ladder body of tricing line and fastens; Ladders body in both sides arranges respectively collapse each two of the insulation pull rope of waist of anti-terraced body; On the foot of ladder of a side ladder body, foot of ladder fixture is set, foot of ladder fixture is followed closely in underground;

2) insulation double ladder promote: work director commander and specialize under tutorial monitoring, divide two groups by terraced body one side ground electrician, every group of each traction one thoroughly does away with edge pull rope, and ground electrician's tractive insulation protection rope of terraced body opposite side prevents from promoting excessive generation and falls terraced; Two ground electricians are with riding foot of ladder fixture, and both hands cooperation lifting, stand on ground until insulation double ladder is herringbone;

3) double ladder that will insulate is in place: hold respectively four ground electricians under the condition of insulation tricing line, take off foot of ladder fixture; Ground electrician divides two groups insulation double ladder stationary transfers to first setting, and ladder head exceeds 1.6-0.8m than soft bus, and soft bus is apart from terraced body 100-150mm;

4) fixed insulation double ladder: the insulation tricing line at a ladder two ends is strained and fixed along the both sides extended line direction of ladder head respectively, and wherein a side is at least used wire grip in an eradication edge tricing line, makes rope tensile force be no less than 1KN;

By the insulation pull rope tension of terraced body both sides, tie up to respectively on earth anchor and fix, make both sides ladder body projection slightly laterally;

5) before ascending stair, prepare: equipotential electrician wears a complete set of qualified screening clothing, wears goggles, check that by specific responsibility guardian whether screening clothing outward appearance is good, whether each several part connection is reliable, whether protection sling is correct, qualified rear permission ascending stair;

6) ascending stair operation: two ground electricians respectively hold up a side ladder body, another two ground electrician's tractive insulation protection ropes, equipotential electrician is along a side ladder body ascending stair, in climbing, ensure that combinational gap is greater than 2.1m, phase spacing is greater than 2.5m, in way, successively three are opened apart from tricing line and fastened, until job position, fasten seat belts, shift current potential, enter highfield, human body exposed part should keep the safe distance of 0.3m, equipotential electrician hangs over shielding equalizer between soft bus and screening clothing, guarantee in the situation that both hands leave electrified body, also remain equipotential,

7) fixing soft bus: equipotential electrician installs two groups of wire fixed arms with it at a side ladder, and soft bus is held up by wire fixed arm, is banded in soft bus on wire fixed arm with copper cash, prevents soft bus swing;

8) remove fixed contact: extinguishing arc coaster is hung on soft bus, and one, extinguishing arc rope in the first side T-shape cable clamp of stationary contact bottom, has fixed contact to be no less than the room for promotion of 100mm through the pulley colligation of extinguishing arc coaster, and extinguishing arc rope tail of rope is controlled by a ground electrician; On the step a little more than soft bus, be a locking coaster with electrodeless rope sling, one of insulating cord passes the pulley of locking coaster and ties up in fixed contact opposite side T-shape cable clamp bottom, and insulating cord tail of rope is controlled by a ground electrician; On fixed contact, one of colligation falls to controlling insulating cord, falls to controlling insulating cord tail of rope and is controlled by another ground electrician;

Equipotential electrician first unloads the bolt of T-shaped wire clamp one side of fixed contact, then unloads the bolt of opposite side, in operating process, controls two ground electricians of extinguishing arc rope and insulating cord tail of rope, coordinates tension tail of rope;

9) fall fixed contact: under work director's commander, two ground electricians control respectively extinguishing arc rope and insulating cord starts slack rope, another ground electrician controls and falls to controlling insulating cord angle, makes fixed contact depart from soft bus and slowly drops on ground;

10) EO exits: equipotential electrician removes the aluminium infantees being wrapped on soft bus, the copper cash of the fixing soft bus on wire fixed arm is opened, allow through work director, equipotential electrician removes shielding equalizer, shift current potential, exit equipotential state, human body exposed part keeps the safe distance of 0.3m, open safety belt, return to ground along ladder;

11) shift insulation double ladder: the rope of opening all fixed ladder bodies, make whole ladder outside soft bus beyond side shifting 1m after, control rope with it of the ladder slow tilt drop of double ladder that makes to insulate, in the time that ladder head is above lower than soft bus 0.5m, two groups of ground electricians move to next setting, repeating step 1 by insulation double ladder from soft bus below) to step 10) charged dismounting fixed contact;

12) step 1 in repeated removal step) to step 11), until the whole dismountings of the soft bus upper static contact of three-phase are complete;

Two, installation steps:

1) insulation double ladder is prepared before promoting: first at an enclosed type coaster of insulation double ladder top hanging, wear a bar insulation protection rope on enclosed type coaster; At a ladder two ends, two of insulation tricing lines are respectively set respectively; Between the ladder body of both sides, from top to bottom arrange and open apart from three of tricing lines, reserved appropriate length, opening apart from one end and the side ladder body of tricing line is slip-knot, opens apart from the other end and the opposite side ladder body of tricing line and fastens; Ladders body in both sides arranges respectively collapse each two of the insulation pull rope of waist of anti-terraced body; On the foot of ladder of a side ladder body, foot of ladder fixture is set, foot of ladder fixture is followed closely in underground; Apart from a ladder 40-80cm place both sides ladder, cross-arm base is being installed respectively with it, cross-arm is flexibly connected with cross-arm base;

2) insulation double ladder promote: work director commander and specialize under tutorial monitoring, divide two groups by terraced body one side ground electrician, every group of each traction one thoroughly does away with edge pull rope, and ground electrician's tractive insulation protection rope of terraced body opposite side prevents from promoting excessive generation and falls terraced; Two ground electricians are with riding foot of ladder fixture, and both hands cooperation lifting, stand on ground to being herringbone to the double ladder that insulate;

3) double ladder that will insulate is in place: hold respectively four ground electricians under the condition of insulation tricing line, take off foot of ladder fixture; Ground electrician divides two groups insulation double ladder stationary transfers to first setting, and ladder head exceeds 1.6-0.8m than soft bus, and soft bus is apart from terraced body 100-150mm;

4) fixed insulation double ladder: the insulation tricing line at a ladder two ends is strained and fixed along the both sides extended line direction of ladder head respectively, and wherein a side is at least used wire grip in an eradication edge tricing line, makes rope tensile force be no less than 1KN; By the insulation pull rope tension of terraced body both sides, tie up to respectively on earth anchor, make both sides ladder body projection slightly laterally;

5) before ascending stair, prepare: equipotential electrician wears a complete set of qualified screening clothing, wears goggles, check that by specific responsibility guardian whether screening clothing outward appearance is good, whether each several part connection is reliable, whether protection sling is correct, qualified rear permission ascending stair;

6) ascending stair operation: two ground electricians respectively hold up a side ladder body, another two ground electrician's tractive insulation protection ropes, equipotential electrician is along a side ladder body ascending stair, in climbing, ensure that combinational gap is greater than 2.1m, phase spacing is greater than 2.5m, in way, successively three are opened apart from tricing line and fastened, until job position, fasten seat belts, shift current potential, enter highfield, human body exposed part should keep the safe distance of 0.3m, equipotential electrician hangs over shielding equalizer between soft bus and screening clothing, guarantee in the situation that both hands leave electrified body, also remain equipotential,

7) fixing soft bus: equipotential electrician installs two groups of wire fixed arms with it at a side ladder, and soft bus is held up by wire fixed arm, is banded in soft mother on wire fixed arm with copper wiring, prevents soft bus swing; Equipotential electrician will insulate little pole load in groove load with insulating cord bundle jail, afterbody insulating cord and the step bundle of little pole of insulating is firm, the fixing link of little pole end of making to insulate is placed in soft bus outside, the movable link insulating on little pole is positioned at soft bus inner side, and between two links, distance is to be slightly larger than new fixed contact width;

8) new fixed contact is prepared before installing: equipotential electrician hangs up properly locking coaster in the fixing link of insulation little pole end, in the movable link on the little pole of insulation, penetrates an extinguishing arc rope, connects an extinguishing arc line at extinguishing arc coaster between soft bus; A ground electrician surveys chi metal hanger insulating bar and hangs on soft bus, survey chi afterbody as for ground, survey chi middle part load in the middle of dumbbell shape moving contact, form sight alignment, find the center hanging point of soft bus static contact accurately, equipotential electrician makes after fixed contact and soft bus contact portion width mark with marking pen, uses wire brush in mark width, wire is processed totally, evenly coated neutral vaseline;

Ground electrician removes paint on fixed contact connecting plate and the parallel groove clamp assembling and dirty, coat neutral vaseline, lift to operating location below, the insulation stay cord and the extinguishing arc tail of rope portion that hang down at the little pole of insulation according to fixed contact size side-line, be again one in fixed contact bottom and promote tricing line;

9) fixed contact is installed: under work director's commander, two ground electricians distinguish the fag end of tractives insulation stay cord and extinguishing arc rope, ground electrician's tractive promotes tricing line, make fixed contact slowly approach soft bus, equipotential electrician turns to arcing opposition side head, and the high temperature of avoiding arc light to produce is burnt;

In the time that fixed contact is steadily parked in 50-60mm place, soft bus below, equipotential electrician pulls down parallel groove clamp bolt on fixed contact connecting plate, parallel groove clamp upper buckle on soft bus, two ground electricians continue to promote fixed contact, in the time of parallel groove clamp bottom on fixed contact connecting plate and top joint close, stop promoting, equipotential electrician installs parallel groove clamp bolt, ground electrician checks soft bus static contact center with insulating bar survey chi and meets after standard, and equipotential electrician is parallel groove clamp bolt tightening;

10) EO exits: equipotential electrician removes lifting tricing line, extinguishing arc rope and the insulation stay cord of colligation on fixed contact; Remove two groups of wire fixed arms; Allow through work director, equipotential electrician removes shielding equalizer, shifts current potential, exits equipotential state, and human body exposed part is opened safety belt after keeping the safe distance of 0.3m, returns to ground along terraced passage;

11) shift insulation double ladder: the rope of opening all fixed ladder bodies, make whole ladder outside soft bus beyond side shifting 1m after, control rope with it of the ladder slow tilt drop of double ladder that makes to insulate, in the time that ladder head is above lower than soft bus 0.5m, two groups of ground electricians move to next setting, repeating step 1 by insulation double ladder from soft bus below) to step 10) charged dismounting fixed contact;

12) repeat the step 1 in installation steps) to step 11), until the whole dismountings of fixed contact on the soft bus of three-phase are complete.