CN104218493B - ± 800kV UHVDC Transmission Lines live-line replacing strain hard tube mother's wire jumper insulator technique - Google Patents

Abstract

The present invention provides one kind ± 800kV UHVDC Transmission Lines live-line replacing strain hard tube mother's wire jumper insulator technique.± 800kV UHVDC Transmission Lines live-line replacing strain hard tube mother's wire jumper insulator technique of the present invention is using the method for transfer hard tube mother and drain line load, wire jumper insulator stress is made to transfer on hard tube mother's lift system bearing tool, thus reaching dismounting wire jumper insulator two ends junction point, smoothly change the purpose of wire jumper insulator.

Description

±800kV UHV DC line live replacement of jumper insulators of strain-resistant hard pipe mother craft

【Technical field】

The invention relates to the field of ultra-high voltage line construction, in particular to a process for live replacement of jumper insulators of tension-resistant rigid tube mothers in ±800kV ultra-high voltage direct current lines.

【Background technique】

With the commissioning of the ±800kV DC UHV line, the research on the topic of live working on ±800kV line has become the main research direction of domestic live working work.

The replacement process of the jumper insulator of the tension-resistant hard pipe mother in the live work of the ±800kV UHV DC line is still blank in China, and it is urgent to invest in research.

【Content of invention】

In view of this, in order to overcome the deficiencies of the existing technology, it is necessary to provide a process for replacing the jumper insulators of the strain-resistant hard tube mother jumpers with live voltage of ±800kV UHV DC lines.

A process for live replacement of jumper wire insulators for tension-resistant hard pipe mothers on ±800kV UHV DC lines, including the following steps: equipotential workers enter the equipotential; ground electricians assemble and connect two sets of hard pipe mothers according to the length of distribution rods measured by on-site investigation system; the ground electrician lifts the hard pipe parent system separately, and two equipotential electricians respectively install the rigid pipe parent lifting jig at the lower end of the rigid pipe parent system on the rigid pipe busbar, and the tower electrician lifts the rigid pipe The tension cross-arm upper fixture is installed on the construction hole of the tension cross-arm; two equipotential electricians simultaneously tighten the screw rod in the hard pipe parent system, so that the pipe bus in the rigid pipe parent lifting fixture is evenly stressed , to transfer the load on the synthetic insulator to the pipe mother lifting system; the equipotential electrician removes the U-shaped hanging ring bolts at the lower end of the synthetic insulator, and the equipotential electrician tie a control rope at the lower end of the synthetic insulator, and the ground electrician loosens the control rope to make the synthetic insulator The insulator slowly approaches the tower body from the inclined state and reaches a natural vertical state. The electrician on the equipotential tower removes the U-shaped hanging ring bolts on the upper end of the synthetic insulator, and the ground electrician controls the transfer rope to place the synthetic insulator on the ground at a constant speed; the ground electrician removes the damaged synthetic insulator from the Remove the new composite insulator from the transmission rope, hang the new composite insulator on the transmission rope, lift the new composite insulator to the hanging point of the cross-arm end, install the U-shaped ring bolts of the new composite insulator on the tower, and tighten the control rope to connect the new composite insulator to the ground electrician. The insulator changes from the natural vertical state to the inclined state. The equipotential electrician installs the U-shaped hanging ring bolt at the female end of the hard pipe; The load on the tube parent system is transferred to the new composite insulator.

In at least one of the embodiments, the hard pipe female lifting system includes a hard pipe female lifting fixture, a screw rod, an insulating pull rod, and a clamp on a tension cross arm, and the hard pipe female lifting fixture, a screw rod, an insulating The pull rod and the clamp on the tension cross arm are assembled and connected to form the lifting pipe mother system, and the combined length of the lifting pipe mother system is consistent with the length of the distribution rod measured by survey.

In at least one of the embodiments, the hard pipe female lifting jig includes a hanging plate and a main plate, the two ends of the hanging plate and the main plate pass through the lugs respectively, and the middle position of the hanging plate is provided with the screw rod. Connected hanging holes, the main board is provided with arc-shaped surfaces near both ends to accommodate the hard pipe busbar, and the lugs are provided with bolts for disassembling or assembling the hanging board and the main board.

In at least one of the embodiments, the clamp on the tension cross arm includes a mounting clamp and a hanging ear, the mounting lug is arranged under the mounting clamp, and a There are reinforcing ribs, the lateral cross-section of the installation clamp is U-shaped to be clamped at the hanging point on the tension cross arm, and there are holes on the installation clamp for bolts to pass through the tension cross arm. The clamp is fixed to the fixing hole on the tension cross arm, and the hanging ear is provided with a hanging hole for connecting with the insulating pull rod.

In at least one of the embodiments, the process further includes the following steps: the electrician on the tower carries the transfer rope to climb the tower, and fixes the fixed point at the hanging point of the cross arm; the electrician on the ground transfers the hanging basket and the pulley block system to the tower through the transfer system The electrician on the tower; the electrician on the tower arranges the hanging basket and the pulley block on the tower according to the equipotential way of entering and exiting the hanging basket; the equipotential electrician sits in the hanging basket, and the ground electrician controls the control rope of the pulley block system so that the hanging basket takes the fixed rope as the radius and The arc trajectory slowly approaches the hard tube busbar of the strain tower, and uses a potential transfer rod to hook the hard tube busbar at a distance of 0.5 meters from the hard tube busbar to enter a strong electric field.

In at least one of the embodiments, the process further includes the following steps: the equipotential electrician cooperates with the electrician on the tower to dismantle the lifting tube mother system, and the ground electrician transfers the hard tube parent system to the ground through the transfer rope; the equipotential electrician sits Put the potential transfer rod into the hanging basket and hook the potential transfer rod to the hard pipe mother. The ground electrician tightens the control rope of the pulley group. After the potential transfer rod is stressed, the equipotential electrician releases the potential transfer rod. Pass the hanging basket and the transfer rope system to the electrician on the ground, and the electrician on the tower checks whether there are any leftovers on the tower and then descends the tower.

The ±800kV UHV DC line of the present invention adopts the method of transferring the load of the hard pipe mother and the drain wire to transfer the force of the jumper insulator to the load-bearing tool of the hard pipe mother lifting system, Thereby, the purpose of removing the connecting points at both ends of the jumper insulator and smoothly replacing the jumper insulator is achieved.

【Description of drawings】

Fig. 1 is a schematic diagram of fixing transmission ropes in the process of live replacement of insulators of jumper wires of strain-resistant rigid tubes provided by a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of the arrangement of the hanging basket pulley block system in the process of live replacement of insulators of tension-resistant hard tube mother jumper wires on ±800kV UHV DC lines provided by a preferred embodiment of the present invention.

3A and 3B are respectively the front view and the left view of the hard pipe female lifting jig used in the process of the present invention.

Figures 4A, 4B and 4C are the right view, front view and top view of the tension cross-arm upper jig used in the process of the present invention, respectively.

Fig. 5 is a front view of Fig. 3 which is used in the process of the present invention to lift the pipe mother system.

Fig. 6 is a schematic diagram of removing composite insulators in the process of replacing live jumper insulators of strain-resistant rigid tubes on ±800kV UHV DC lines provided by a preferred embodiment of the present invention.

【detailed description】

In order to better understand the present invention, the invention will be described in detail below in conjunction with the accompanying drawings and specific examples.

The live work of ±800kV UHV DC line is the same as that of 500kV live work. First, the personal safety of personnel must be guaranteed. Therefore, shielding clothing, insulating pull rods, and insulating ropes with ±800kV voltage level must first pass the preventive electrical test before they can be used in live work. used in operation. There are two types of preventive electrical tests:

(1) Operating shock withstand voltage test: the test length is 6.2m, using +250/2500μs standard shock wave, and applying a voltage of 1600kV for a total of 15 times. There should be no flashover, no breakdown, and no heat generation;

(2) DC withstand voltage test: the test length is 6.2m, and a DC voltage of 950kV is applied. The withstand voltage time is 5 minutes. There should be no flashover, no breakdown, and no heat.

Before live-line work, it is necessary to conduct on-site survey on the site tower to judge whether the site environment and the technical parameters of the pole tower meet the live-line work conditions:

(1) On-site survey of the tension tower of the ±800kV UHV DC line needs to verify whether there is any crossing within the side span of the on-site size;

(2) The terrain around the foundation of the tension tower of the ±800kV UHV DC line is sufficient to meet the requirements of the live work site, and there is a station below the work point;

(3) Use an infrared range finder to measure the distance between the lower plane at the cross-arm hanging point of the ±800kV UHV DC line tension tower and the upper plane of the hard pipe mother, and determine the length of the distribution pole of the hard pipe mother system and the length of the hanging basket fixed rope ;

(4) Determine the initial position of the hanging basket and the fixed position of the pulley block according to the length of the fixed rope of the hanging basket;

(5) The technicians need to check the equipotential electrician according to the operation tower to enter the equipotential process, and the live working combination gap is not less than 6.6 meters.

Equipotential workers must wear special shielding clothing for ±800kV live work (including caps, shielding masks, jumpsuits, gloves, conductive socks or conductive shoes, the same below). Flame-retardant underwear should also be worn inside the shielding suit. The performance indicators of the shielding suit should meet the requirements of GB6568-1 and GB6568-2. The shielding efficiency of the shielding mask should not be less than 20dB. All parts of the shielding suit should be connected well and reliably, and the resistance value between the farthest ends of the shielding suit and trousers should not exceed 20Ω when measured with a multimeter.

The ±800kV UHV DC line of the present invention adopts the method of transferring the load of the hard pipe mother and the drain wire to transfer the force of the jumper insulator to the load-bearing tool of the hard pipe mother lifting system, Thereby, the purpose of removing the connecting points at both ends of the jumper insulator and smoothly replacing the jumper insulator is achieved. The replacement process of the ±800kV UHV DC line of the present invention is specifically as follows:

(1) The electrician on the tower climbs the tower with the transmission rope, fixes the fixed point at the cross-arm hanging point, and installs the transmission system as shown in Figure 1.

(2) The electrician on the ground passes the hanging basket and the pulley block system to the electrician on the tower through the transmission system.

(3) The electrician on the tower arranges the hanging basket and the pulley block on the tower according to the method of entering and exiting the equipotential of the hanging basket method (as shown in Figure 2).

(4) After the electrician on the tower checks that the connection of the pulley block system is intact, the equipotential electrician sits in the hanging basket, and the ground electrician controls the control rope of the pulley block system, so that the hanging basket takes the fixed rope as the radius and slowly approaches the hard tube of the tension tower with an arc track Mother, at a distance of 0.5 meters from the hard pipe mother, use a potential transfer rod to hook the hard pipe mother and enter a strong electric field. At this time, the equipotential electrician reaches the same potential as the ±800kV UHV DC line.

(5) The electrician on the ground lifts the hard pipe female lifting fixture 100 (as shown in Figure 3A and 3B), the mechanical screw rod 200, the insulating pull rod 300, and the tension cross arm upper fixture 400 ( As shown in Figures 4A, 4B, and 4C) are assembled and connected into a lifting pipe parent system (as shown in Figure 5), and the combined length should be consistent with the length of the distribution rod measured by survey. In the operation process, a total of two sets of hard pipe parent systems need to be provided.

The hard pipe female lifting jig 100 includes a hanging plate 110 and a main board 120 , and the two ends of the hanging plate 110 and the main board 120 are respectively connected by lugs 130 . A hanging hole 112 is opened in the middle of the hanging plate 110 for connecting with the hydraulic screw rod 200 . Near both ends of the main board 120 are provided arc-shaped surfaces 122 for accommodating hard tube busbars. Bolts 132 are provided on the lugs 130 for disassembling or assembling the hanging board 110 and the main board 120 .

The clamp 400 for the upper tension arm includes a mounting clamp 410 and a hanging ear 420, the mounting lug 420 is arranged below the mounting clamp 410, and the mounting clamp 410 and the hanging ear 420 are directly provided with a reinforcing rib 430 connecting the two. The lateral cross-section of the installation clamping plate 410 is in a horizontal U shape, and is used to be clamped at the hanging point on the tension cross arm. A fixing hole is provided on the installation clamping plate 410 for passing the bolts through and fixing the clamp 400 on the tension cross arm to the tension cross arm. A hanging hole 422 is opened on the hanging ear 420 for connecting with the insulating pull rod 300 .

(6) The ground electrician lifts the hard pipe parent system separately, and two equipotential electricians respectively install the lower end of the rigid pipe parent lifting jig 100 on the hard pipe bus. The electrician on the tower installs the clamp 400 on the tension cross arm on the construction hole of the tension cross arm.

(7) After the pipe mother lifting system is installed, two equipotential electricians tighten the hydraulic screw rod 200 at the same time, so that the pipe bus bars in the hard pipe mother lifting jig 100 are evenly stressed, and the load on the composite insulator is transferred to the pipe mother boost system.

(8) Please refer to Figure 6. The equipotential electrician removes the U-shaped hanging ring bolts at the lower end of the synthetic insulator. The equipotential electrician fastens a control rope at the lower end of the synthetic insulator. The ground electrician loosens the control rope so that the synthetic insulator is slowly approached from the inclined state The tower body finally reaches a natural vertical state. The electrician on the equipotential tower removes the U-shaped hanging ring bolts at the upper end of the composite insulator, and the ground electrician controls the transfer rope to place the composite insulator on the ground at a constant speed.

(9) The ground electrician removes the damaged synthetic insulator from the transmission rope, hangs the new synthetic insulator on the transmission rope, lifts the new synthetic insulator to the hanging point of the cross-arm end, and the electrician on the tower installs the U-shaped hanging ring bolt. The ground electrician tightens the control rope to change the insulator from the natural vertical state to the inclined state at an even speed, and the equipotential electrician installs the U-shaped hanging ring bolt at the female end of the hard pipe.

(10) After the equipotential electrician checks the stress of the new synthetic insulator, he loosens the hydraulic screw rod 200, and transfers the load on the hard pipe parent system to the new synthetic insulator.

(11) The equipotential electrician cooperates with the electrician on the tower to remove the hard pipe parent system, and the ground electrician transfers the hard pipe parent system to the ground through the transfer rope.

(12) The equipotential electrician sits in the hanging basket, hooks the potential transfer rod to the hard pipe mother, the ground electrician tightens the control rope of the pulley block, and the hanging basket is stressed. After the potential transfer rod is stressed, the equipotential electrician releases the potential transfer rod , the equipotential electrician returns to the crossarm (ground potential) at a constant speed.

(13) The electrician on the tower passes the hanging basket and the transfer rope system to the electrician on the ground, and the electrician on the tower checks whether there is any residue on the tower and then goes down the tower.

The ±800kV UHV DC line of the present invention adopts the method of transferring the load of the hard pipe mother and the drain wire to transfer the force of the jumper insulator to the load-bearing tool of the hard pipe mother lifting system, Thereby, the purpose of removing the connecting points at both ends of the jumper insulator and smoothly replacing the jumper insulator is achieved.

The method for replacing the jumper insulators of the tension-resistant hard pipe mother jumper insulators of the ±800kV UHV DC line of the present invention has the following innovations:

First of all, it is the first time in the country to replace the insulator of the tension-resistant hard tube mother jumper insulator of the ±800kV UHV DC line;

Furthermore, the design and use of the tool for the hard pipe parent system is the first in the country;

Finally, it is the first time in the country to replace the synthetic insulators of the ±800kV UHV DC line strain-resistant rigid pipe jumper wires during live work.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (6)

1. one kind ± 800kV UHVDC Transmission Lines live-line replacing strain hard tube mother wire jumper insulator technique, comprises the following steps：

Isoelectric level workman enters isoelectric level；

Ground electrician becomes two sets to carry hard tube mother system according to the pole length assembly and connection of joining that the inspection of the scene of a crime measures；

Ground electrician lifts by crane respectively and carries hard tube mother system, and two isopotential electrical work points will not be female for the hard tube carrying hard tube mother system lower end Lifting dogs are arranged on hard pipe bus, and on tower, electrician is arranged on strain insulator by carrying fixture on the strain cross arm of hard tube mother system upper end On the construction hole of cross-arm；

Two isoelectric level electricians tighten up the screw mandrel carrying in hard tube mother system simultaneously, make the pipe bus in hard tube mother's lifting dogs uniform Stress, by the load transfer on composite insulator to pipe mother's lift system；

Isoelectric level electrician removes the U-shaped suspension bolt of composite insulator lower end, and isoelectric level electrician is one in composite insulator lower end Root tricing line, ground electrician eases out tricing line makes composite insulator near tower body and reach nature plumbness by heeling condition, On isoelectric level tower, electrician removes the U-shaped suspension bolt of composite insulator upper end, and ground electrician controls transmission to restrict composite insulator At the uniform velocity place ground；

Damaged composite insulator is removed from transmission rope by ground electrician, new composite insulator is hung on transmission rope, lifting To cross-arm-end hanging point, on tower, electrician installs the U-shaped suspension bolt of new composite insulator to new composite insulator, and ground electrician tighten up New composite insulator is changed into heeling condition from natural plumbness by tricing line, and isoelectric level electrician installs the U-shaped link of hard tube female end Bolt；

Isoelectric level electrician eases out, after checking new composite insulator stressing conditions, the screw mandrel carrying in hard tube mother system, will carry hard tube maternal Load transfer on system is on new composite insulator.

2. ± 800kV UHVDC Transmission Lines live-line replacing strain hard tube mother's wire jumper insulator work according to claim 1 Skill it is characterised in that：The described hard tube mother system that carries includes hard tube mother's lifting dogs, screw mandrel, insulated tension pole, blocks on strain cross arm Have, described in fixture assembly and connection one-tenth on described hard tube mother's lifting dogs, screw mandrel, insulated tension pole, strain cross arm, carry hard tube mother system, Described carry the length that hard tube mother system combines and prospecting measurement to join pole length consistent.

3. ± 800kV UHVDC Transmission Lines live-line replacing strain hard tube mother's wire jumper insulator work according to claim 2 Skill it is characterised in that：Described hard tube mother's lifting dogs include link plate and mainboard, and ear is passed through at the two ends of described link plate and mainboard respectively Piece, the centre position of described link plate offers the hanging hole being connected with described screw mandrel, described mainboard is provided with two ends accommodating The arcwall face of hard pipe bus, described auricle is provided with the bolt making described link plate and mainboard dismounting or assembling.

4. ± 800kV UHVDC Transmission Lines live-line replacing strain hard tube mother's wire jumper insulator work according to claim 3 Skill it is characterised in that：On described strain cross arm, fixture includes installing clamp and hangers, and described hangers is arranged on described installation clamp Lower section, be provided with reinforcement between described installation clamp and hangers, the lateral cross of described installation clamp is in that sleeping U-shaped is set with card At the upper hanging point of strain cross arm, described installation clamp offers pass through for bolt and fixture on described strain cross arm is fixed Fixing hole on strain cross arm, described hangers is offered the hanging hole for being connected with described insulated tension pole.

5. ± 800kV UHVDC Transmission Lines live-line replacing strain hard tube according to any one of claim 1 to 4 is female to jump Line insulator technique is it is characterised in that described technique is further comprising the steps of：

On tower, electrician carries transmission rope and steps on tower, accomplishes fluently fixing point at cross-arm hanging point；

Hanging basket and pulley block system are passed to electrician on tower by transmission system by ground electrician；

On tower, hanging basket is passed in and out equipotential mode with assembly pulley according to hanging basket method and carries out arranging on tower by electrician；

Isopotential electrical work area enters hanging basket, and ground electrician controls pulley block system tricing line to make hanging basket with static line as radius, with circle Arc track is near anchor support hard pipe bus, and it is strong to catch on the female entrance of hard tube using electric potential transferring stick at 0.5 meter from hard pipe bus Electric field.

6. ± 800kV UHVDC Transmission Lines live-line replacing strain hard tube according to any one of claim 1 to 4 is female to jump Line insulator technique is it is characterised in that described technique is further comprising the steps of：

Isoelectric level electrician carries hard tube mother system with electrician's cooperation dismounting on tower, and ground electrician will carry hard tube mother system and be restricted by transmission It is transferred to ground；

Isopotential electrical work area enters hanging basket and electric potential transferring stick is hooked hard tube mother, and ground electrician tightens up assembly pulley tricing line, treats electricity After bit transition rod stress, isoelectric level electrician eases out electric potential transferring stick, and isoelectric level electrician at the uniform velocity returns to cross-arm；

On tower, hanging basket and transmission are restricted systems communicate to ground electrician by electrician, under on tower, electrician checks and has or not after legacy on tower Tower.