CN107895900B - Method for treating leakage defect of HGIS equipment by adopting gate-type framework settlement breaker method - Google Patents
Method for treating leakage defect of HGIS equipment by adopting gate-type framework settlement breaker method Download PDFInfo
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- CN107895900B CN107895900B CN201710846861.5A CN201710846861A CN107895900B CN 107895900 B CN107895900 B CN 107895900B CN 201710846861 A CN201710846861 A CN 201710846861A CN 107895900 B CN107895900 B CN 107895900B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
Abstract
The method for treating the leakage defect of HGIS equipment by using a gate-type framework settlement breaker method is characterized by comprising the following steps of: the method comprises the following steps: (1) The gas recovery is needed before the disassembly is needed to maintain the gas chamber, and the disassembly gas chamber is required to be vacuumized and then reduced to zero gauge pressure; (2) The device above the circuit breaker is required to be reliably supported by using the bracket; (3) After the two works are completed, the vacuum state of the disassembling air chamber is relieved, and the connecting cable of the circuit breaker mechanism and the surface valve are disassembled; (4) Disassembling the basin-type insulator at the fault part of the circuit breaker, and replacing the basin-type insulator for assembly; (5) Readjusting a lifting rope and a chain block, and horizontally lifting the circuit breaker; (6) Keeping the new breaker at the same height after assembly and before disassembly; and replacing the adsorbents in the isolation air chambers at the two sides of the circuit breaker, vacuumizing and performing subsequent air inflation operation. Only need with the circuit breaker vertical settlement when having a power failure, the contact surface is handled and is lifted vertically after accomplishing, when reducing the operation degree of difficulty, has promoted work efficiency.
Description
Technical Field
The invention relates to a method for treating leakage defect of HGIS equipment by using a gate-type framework settlement breaker method.
Background
Currently HGIS (HALF GAS INSUNLATED SWITCH) is short for gas insulated switchgear, and is composed of a circuit breaker, an isolating switch, a grounding switch, a current transformer and other elements in an intensive manner, and in recent years, with the increasing of the cost of land, gas insulated metal fully-closed switch equipment and conventional open switch equipment HGIS equipment gradually become main equipment of an ultra-high voltage transformer substation, but due to the fact that the equipment is poor in sealing and SF6 gas leakage under the influence of external environmental factors is gradually increased, the equipment becomes one of the main defects of the HGIS equipment, and hidden danger is brought to the safe operation of a power grid.
The ultra-high voltage transformer substation is a main body frame of the power grid, whether a power failure occurs to a line or a bus, the safety of the power grid is seriously affected, the disassembly workload of HGIS equipment is large, the process is complex, and the requirements on site environment are high. All the requirements are that technicians reduce the power failure range while guaranteeing the construction quality, avoid the risk of field operation and improve the construction process.
Disclosure of Invention
The invention aims to:
the invention provides a method for treating leakage defect of HGIS equipment by using a gate-type framework settlement breaker method, which aims to solve the problems existing in the past.
The technical scheme is as follows:
the method for treating the leakage defect of HGIS equipment by using a gate-type framework settlement breaker method is characterized by comprising the following steps of: the method comprises the following steps:
(1) After power failure, gas recovery is needed before the disassembly of the gas chamber, and the disassembly gas chamber is required to be vacuumized and then reduced to zero gauge pressure; adjacent air chambers of the disassembly air chamber need to be depressurized to 0.2Mpa; the air pressure of the other air chambers is unchanged and is the rated pressure;
(2) Before overhauling the circuit breaker, the bracket is required to reliably support equipment above the circuit breaker;
(3) Disassembling the circuit breaker: after the two works are completed, the vacuum state of the disassembling air chamber is released, and the connecting cable and the meter valve of the breaker mechanism are disassembled for assembly; winding a circuit breaker by using a lifting rope, lifting the circuit breaker by using a chain block, enabling the lifting rope to be in a tight state, loosening a connecting nut of the circuit breaker and a current transformer, and adjusting the chain block to enable bolt gaps penetrating through flange screw holes of the current transformer to be uniform; loosening the bolts of the breaker support, and detaching the breaker support; adjusting a chain block to stably place the circuit breaker on the ground;
(4) The basin-type insulator at the fault part of the circuit breaker is disassembled, the basin-type insulator is replaced for assembly, the sealing part of the tank body is overhauled and cleaned, the new basin-type insulator is assembled on the circuit breaker after dampproof and dustproof treatment is carried out in the operation process, and meanwhile, the rear cover is opened to clean the inside of the circuit breaker;
(5) Circuit breaker recovery: readjusting a lifting rope and a chain block, and horizontally lifting the circuit breaker; cleaning the upper surface of a basin-type insulator of the circuit breaker and a butt flange opening of a current transformer, and wrapping the basin-type insulator by using clean plastic cloth; butting the circuit breaker with a current transformer from bottom to top, and rolling up and taking down plastic cloth on the basin-type insulator along one direction when the basin-type insulator is close to the CT flange; the circuit breaker is in butt joint with the current transformer; adjusting a guide chain, slowly lifting the breaker tank body upwards, and rotating the tooling clamp during the lifting process to ensure that the tooling clamp keeps a clamping flange state until the butt flange is closed; after the butt flanges are folded, two centering nuts are used in the 180-degree direction of the flanges, the butt flanges are screwed in a centering mode, and then the flanges are screwed by assembling the nuts;
(6) Adjusting to enable the new breaker to be kept at the same height after assembly and before disassembly; and replacing the adsorbents in the isolation air chambers at the two sides of the circuit breaker, vacuumizing and performing subsequent air inflation operation.
(2) The supporting point is positioned at the bottom of the vertical flange of the isolating switch tank body; the bracket adopts a door-shaped structure.
(3) In the step, when the connecting nut of the breaker and the current transformer is loosened, the nut on the upper surface of the flange of the basin-type insulator is loosened first.
(5) In the step of butt joint of the circuit breaker and the current transformer, attention is paid to the fact that a conductor is firstly led into a contact at the basin-type insulator of the circuit breaker, then a guide sleeve is led into a screw hole of a flange of the current transformer, and after the guide sleeve is led into the screw hole, the flange of the circuit breaker and the flange of the current transformer are clamped by using a tooling clamp.
(6) Recording the change of the vacuum degree of the air chamber when the disassembled air chamber is vacuumized; pumping the pressure to below 40Pa, continuously pumping for 0.5 hour, and stopping the vacuum pump to stand for two hours; re-measuring the vacuum degree to be not more than 133Pa, and obtaining the qualified product; when in inflation, the gas bottle adopts inverted inflation, the bottom of the gas bottle is higher than the bottle mouth, the on-site humidity is not more than 80%, and the purity and the moisture content are tested after the gas bottle is stationary; and recovering the control cable, and removing the support of the tank above the circuit breaker.
The bracket of the door-shaped structure comprises a door-shaped frame, two chain blocks symmetrically arranged on a top cross beam of the door-shaped frame and a binding belt connected to the bottoms of the two chain blocks.
The door-type frame is of a structure formed by a cross beam and upright posts, a bearing follow-up plate for bearing the circuit breaker in use is also arranged between the upright posts, the four corners of the bearing follow-up plate are respectively provided with a follow-up gear, the follow-up gears extend into vertical sliding grooves in the upright posts of the door-type frame and are meshed with vertical racks fixed in the sliding grooves, and when the door-type frame is in use, the follow-up gears are meshed with the vertical racks to move up and down along the vertical sliding grooves; the axial direction of the follow-up gear is the same as the axial direction of the circuit breaker; (i.e., the direction through the strap).
The two ends of the bearing follow-up plate are inserted with a telescopic pull rod, one end of the telescopic pull rod extends into the bearing follow-up plate and can be pulled and inserted relative to the bearing follow-up plate, the other end of the telescopic pull rod is connected with a movable hook, the movable hook is hooked on a fixed column at the bottom of the pressing rod when in use, the top end of the pressing rod is movably connected with a fixed sleeve, and the fixed sleeve is sleeved with a vertical pipe of a connecting flange at two ends of the circuit breaker from the outer side when in use;
the upright post of the door-shaped frame is also provided with an I-shaped follow-up tensioning piece, the follow-up tensioning piece comprises an upper tensioning mechanism and a lower supporting mechanism, the upper tensioning mechanism is arranged above the lower supporting mechanism, and the upper tensioning mechanism is connected with the lower supporting mechanism through a connecting post; the upper tensioning mechanism comprises a shell and two tensioning piece gears arranged in the shell, and the two tensioning piece gears are respectively meshed with fixed racks on two sides of the upright post of the door-shaped frame and can be meshed with the racks to move up and down; the lower supporting mechanism comprises a shell and two supporting piece gears arranged in the shell, wherein the two supporting piece gears are respectively meshed with fixed racks on two sides of a stand column of the door-shaped frame and can be meshed with the racks to move up and down; the outer side of the upper tensioning mechanism is provided with a tensioner, and the tensioner comprises a transverse telescopic tensioning rod with one end extending into the upper tensioning mechanism shell and a vertical stretching rotating rod for controlling the telescopic action of the transverse telescopic tensioning rod, and the other end of the transverse telescopic tensioning rod is connected to the upper part of the pressing rod through a temporary connecting piece; the lower end of the vertical stretching rotating rod stretches into the shell and is vertical to the transverse stretching tensioning rod, the part of the transverse stretching tensioning rod stretching into the shell is of a worm structure, the part of the vertical stretching rotating rod stretching into the shell is provided with a worm wheel meshed with the worm structure of the transverse stretching tensioning rod, and the worm wheel and the vertical stretching rotating rod jointly rotate to control stretching of the transverse stretching tensioning rod;
the outer side of the lower supporting mechanism is provided with a fulcrum rod which is propped against the middle part or the position below the middle part of the compression rod when in use, so that the compression rod forms a lever structure;
the support follower plate is further provided with a support wheel column, the top of the support wheel column supports the elastic idler wheel at the bottom of the circuit breaker when the support follower plate is used, the bottom of the support wheel column is provided with a driving gear, the portion of the telescopic pull rod extending into the support follower plate is provided with a rack, the rack is meshed with the driving gear, and when the telescopic pull rod is pulled outwards, the support wheel column rotates until the elastic idler wheel supports the bottom of the circuit breaker.
When the elastic roller props against the bottom of the circuit breaker, the supporting wheel column is in a non-vertical state, namely the supporting wheel column is inclined; the supporting wheel column and the supporting follow-up plate are clamped at an acute angle, a buffering elastic strip is arranged between the supporting wheel column and the supporting follow-up plate, an arc-shaped limiting sliding hole which is matched with the buffering elastic strip in shape is formed in the upper portion of the buffering elastic strip, a protruding column on the lateral side of the supporting wheel column extends into the arc-shaped limiting sliding hole, the bottom of the arc-shaped limiting sliding hole is arranged above the middle point of the buffering elastic strip, and therefore when the supporting wheel column is subjected to rapid pressure falling, the protruding column on the lateral side of the supporting wheel column falls to the bottom of the arc-shaped limiting sliding hole and can compress the buffering elastic strip.
The temporary connecting piece connected with the transverse telescopic tension rod and the compression rod is two openings connected together through a connecting sheet, the two openings are arranged at two ends of the connecting sheet, a square clamping strip is arranged on the transverse telescopic tension rod, a cylindrical bulge is arranged on the upper part of the compression rod, and when the transverse telescopic tension rod is used, the two openings are respectively clamped on the square clamping strip and the cylindrical bulge to realize the connection of the transverse telescopic tension rod and the compression rod; (the square clamping strip is adopted on the transverse telescopic tension rod to prevent the temporary connecting piece from rotating relative to the transverse telescopic tension rod, and one end of the connecting compression rod is required to be rotatable) the position of the cylindrical bulge is arranged above the fulcrum rod, and one or more cylindrical bulges are arranged along the length direction of the compression rod.
The telescopic pull rod, the compression rod and the I-shaped follow-up tensioning piece are four groups, and each group is arranged by taking the upright post of the gate-shaped frame as a unit;
the front end of the fulcrum rod is provided with a follow-up roller which is propped against the pressing rod during use.
The advantages and effects:
the invention provides a method for treating leakage defects of HGIS equipment by a door-type frame settlement circuit breaker method, which is based on comprehensive overhaul of a 500kV Pu He transformer substation, wherein the door-type frame settlement circuit breaker method is adopted in the treatment of the gas leakage defects of a circuit breaker gas chamber SF6, namely, a connecting bolt of a butt flange part of a leakage phase circuit breaker and a current transformer is detached, the leakage circuit breaker is sunk to the ground, a basin-type insulator of the leakage circuit breaker is detached, leakage points are searched for and overhauled, or parts are replaced, and after the working is finished, the butt joint of the circuit breaker and the current transformer is lifted.
Compared with the traditional disintegration method, the door-type framework method has obvious improvement in the aspects of safety management, working efficiency, economic benefit and the like, and is mainly embodied in the following 5 aspects:
1. reducing power outage range
The operation site of the leakage defect of the breaker can be narrowed by adopting the door-type frame settlement method, for example, when the 3/2 wiring type edge breaker is processed, the operation interval is removed and the lead wires between the buses are restored respectively only on the first day of power failure and the voltage withstand test day. The bus power failure is not needed during disassembly, the bus power failure time is greatly shortened, the safety distance of a treatment operation site is small, and the risk of site operation is small.
2. The construction difficulty is reduced, and the workload is reduced;
the traditional method for disassembling the HGIS equipment has the defects that when the knife switch air chamber which is needed to be hoisted is in the 'L' -shaped structure, the construction difficulty is high, 5 air chambers which need to recycle gas are respectively two sleeve air chambers, two knife switch air chambers and a breaker air chamber, as shown in figure 3, and the treated contact surfaces are more; the gas leakage defect of the breaker can be reduced by adopting a door-type frame sedimentation method to treat the gas leakage defect of the breaker, and the number of gas chambers for recovering the gas and the treated contact surfaces is 3, namely two disconnecting link gas chambers and a breaker gas chamber, which are shown in figure 4.
3. The CT secondary wiring is not moved, so that the system risk is reduced;
the gate-type frame sedimentation method is adopted to treat the air leakage defect of the breaker, so that the secondary line work of the disconnecting and connecting current transformer can be avoided, the workload is reduced, a power transmission scheme is not needed during power transmission, a large number of switching operation times are reduced, and the operation risk and the system risk are effectively avoided.
4. The crane is not used on site, so that the operation risk is avoided;
when the crane is used for disassembling and treating the breaker air chamber, a crane is needed, the HGIS equipment is compact, the crane has a small operable range, adverse factors are brought to the field safety production, and the field construction process and quality are affected by tail gas and dust of the crane.
5. The construction period is shortened, and the power failure time is reduced;
6. when the gas leakage defect of the gas chamber of the circuit breaker is treated, the gas recovery, disassembly, vacuumizing, stillness, withstand voltage test and the like are required, the treatment of a group of circuit breakers approximately takes seven days, the door frame sedimentation method is adopted to treat the gas leakage defect of the circuit breaker, and the door frame fixing chain block is arranged before power failure, so that most of preparation work can be completed before power failure. Only need with the circuit breaker vertical settlement when having a power failure, the contact surface is handled and is lifted vertically after accomplishing, when reducing the operation degree of difficulty, has promoted work efficiency.
Drawings
FIG. 1 is a schematic view of a portal frame of the present invention;
FIG. 2 is a schematic diagram of a split process gas recovery;
FIG. 3 is a schematic diagram of gas recovery by portal frame sedimentation;
FIG. 4 is a schematic illustration of a bracket structure of a door-type structure;
FIG. 5 is an enlarged view of the I-shaped follower tensioner portion, i.e., the E portion;
fig. 6 is an enlarged view of the buffer spring strip portion, i.e., the F portion.
Detailed Description
The invention is described in detail below with reference to the attached drawings:
the method for treating leakage defect of HGIS equipment by using a gate-type framework settlement breaker method comprises the following specific construction scheme:
(1) After power failure, gas recovery is needed before the disassembly of the gas chamber, and the disassembly gas chamber is required to be vacuumized and then reduced to zero gauge pressure; adjacent air chambers of the disassembly air chamber need to be depressurized to 0.2Mpa; the air pressure of the other air chambers is unchanged and is the rated pressure.
(2) Before overhauling the circuit breaker, need use the support to carry out reliable support to the equipment above the circuit breaker, specific strong point see fig. 1 schematically, strong point is located the vertical flange bottom of isolator jar body. The bracket adopts a door-shaped structure.
(3) Disassembling the circuit breaker: after the two works are completed, the vacuum state of the disassembling air chamber is released, and the connecting cable of the breaker mechanism, the assembly of the surface valve and the like are disassembled; lifting the circuit breaker by using a lifting rope and a chain block (tightening the lifting rope), loosening a connecting nut of the circuit breaker and a current transformer (loosening a nut on the upper surface of a flange of a basin-type insulator at first), and adjusting the chain block to ensure that the gap of a bolt penetrating through a screw hole of the flange of the current transformer is uniform; loosening the bolts of the breaker support, and detaching the breaker support; adjusting a chain block to stably place the circuit breaker on the ground; the basin-type insulator at the fault part of the circuit breaker is disassembled, the basin-type insulator is replaced for assembly, the sealing part of the tank body is overhauled and cleaned, and the dampproof and dustproof treatment is carried out in the operation process. And (3) assembling the new basin-type insulator on the circuit breaker, and opening the rear cover to clean the inside of the circuit breaker.
(4) And (3) recovering the circuit breaker: readjusting a lifting rope and a chain block, and horizontally lifting the circuit breaker; cleaning the upper surface of a basin-type insulator of the circuit breaker and a butt flange opening of a current transformer, and wrapping the basin-type insulator by using clean plastic cloth; butting the circuit breaker with a current transformer from bottom to top, and rolling up and taking down plastic cloth on the basin-type insulator along one direction when the basin-type insulator is close to the CT flange; the method comprises the steps of abutting the circuit breaker with a current transformer, taking attention to a conductor to be introduced into a contact at a basin-type insulator of the circuit breaker, then introducing a guide sleeve into a screw hole of a flange of the current transformer, and clamping the flange of the circuit breaker and the flange of the current transformer by using a tooling clamp after the guide sleeve is introduced into the screw hole; adjusting a guide chain, slowly lifting the breaker tank body upwards, and rotating the tooling clamp during the lifting process to ensure that the tooling clamp keeps a clamping flange state until the butt flange is closed; after the butt flanges are folded, two centering nuts are used in the 180-degree direction of the flanges, the butt flanges are screwed in a centering mode, and then the flanges are screwed by assembling the nuts; the circuit breaker bracket is assembled, and the bracket is adjusted to ensure that the new circuit breaker is kept at the same height after being assembled and before being disassembled; and replacing the adsorbents in the isolation air chambers at the two sides of the circuit breaker, vacuumizing and performing subsequent air inflation operation. And (5) recording the change of the vacuum degree of the air chamber when the disassembled air chamber is vacuumized. And (5) continuously pumping for 0.5 hour after the pressure is pumped to below 40Pa, and stopping the vacuum pump for standing for two hours. And re-measuring the vacuum degree to be not more than 133Pa, and obtaining the qualified product. When in inflation, the gas cylinder adopts inverted inflation, the bottom of the gas cylinder is higher than the bottle mouth, the on-site humidity is not more than 80%, and the purity and the moisture content are tested after the gas cylinder is stationary. And recovering the control cable, and removing the support of the tank above the circuit breaker.
The bracket of the door-shaped structure comprises a door-shaped frame 1, two chain blocks 2 symmetrically arranged on a top cross beam of the door-shaped frame 1, and a binding belt 3 connected to the bottoms of the two chain blocks 2.
The door-type frame 1 is a structure formed by a cross beam and upright posts, a supporting follow-up plate 4 for supporting the circuit breaker in use is also arranged between the upright posts, the four corners of the supporting follow-up plate 4 are respectively provided with a follow-up gear 5, the follow-up gears 5 extend into a vertical chute 6 in the upright posts of the door-type frame 1 and are meshed with a vertical rack fixed in the chute 6, and when in use, the follow-up gears 5 are meshed with the vertical rack to move up and down along the vertical chute 6; the axial direction of the follower gear 5 is the same as the axial direction of the circuit breaker; (i.e. the direction through the strap 3)
The two ends of the bearing follow-up plate 4 are inserted with a telescopic pull rod 7, one end of the telescopic pull rod 7 extends into the bearing follow-up plate 4 and can be pulled and inserted relative to the bearing follow-up plate 4, the other end of the telescopic pull rod 7 is connected with a movable hook 8, the movable hook 8 is hooked on a fixed column at the bottom of a pressing rod 9 when in use, the top end of the pressing rod 9 is movably connected with a fixed sleeve 10, and the fixed sleeve 10 is sleeved with a vertical pipe 11 of a connecting flange at two ends of the circuit breaker from the outside when in use;
the upright post of the door-shaped frame 1 is also provided with an I-shaped follow-up tensioning piece, the follow-up tensioning piece comprises an upper tensioning mechanism and a lower supporting mechanism, the upper tensioning mechanism is arranged above the lower supporting mechanism, and the upper tensioning mechanism is connected with the lower supporting mechanism through a connecting post 14; the upper tensioning mechanism comprises a shell and two tensioning piece gears 12 arranged in the shell, and the two tensioning piece gears 12 are respectively meshed with fixed racks on two sides of the upright post of the door-type frame 1 and can be meshed with the racks to move up and down; the lower supporting mechanism comprises a shell and two supporting piece gears 13 arranged in the shell, wherein the two supporting piece gears 13 are respectively meshed with fixed racks on two sides of a column of the door-type frame 1 and can be meshed with the racks to move up and down; the outer side of the upper tensioning mechanism is provided with a tensioner which comprises a transverse telescopic tensioning rod 15 with one end extending into the upper tensioning mechanism shell and a vertical stretching rotating rod 16 for controlling the telescopic action of the transverse telescopic tensioning rod 15, and the other end of the transverse telescopic tensioning rod 15 is connected to the upper part of the pressing rod 9 through a temporary connecting piece; the lower end of the vertical stretching rotary rod 16 stretches into the shell and is vertical to the transverse stretching tension rod 15, the part of the transverse stretching tension rod 15 stretching into the shell is of a worm structure, the part of the vertical stretching rotary rod 16 stretching into the shell is provided with a worm wheel meshed with the worm structure of the transverse stretching tension rod 15, and the worm wheel and the vertical stretching rotary rod 16 jointly rotate to control the stretching of the transverse stretching tension rod 15;
the outer side of the lower supporting mechanism is provided with a fulcrum rod 17 which is propped against the middle part or the position below the middle part of the pressing rod 9 when in use, so that the pressing rod 9 forms a lever structure, and when in use, the upper part of the pressing rod 9 is tensioned by the transverse telescopic tensioning rod 15 to realize tightening of the fixed sleeve 10 and the pressing of the pressing rod 9;
still be provided with supporting wheel post 19 on bearing follower 4, the top of supporting wheel post 19 is for the elasticity gyro wheel 20 of supporting the circuit breaker bottom when using, and supporting wheel post 19 bottom is provided with drive gear 21, and telescopic pull rod 7 stretches into the part of bearing follower 4 and is provided with the rack, and this rack meshes with drive gear 21, and when telescopic pull rod 7 outwards draws, supporting wheel post 19 rotates until elasticity gyro wheel 20 withstands the circuit breaker bottom.
When the elastic roller 20 abuts against the bottom of the circuit breaker, the supporting roller 19 is in a non-vertical state, i.e., the supporting roller 19 is inclined. A buffer spring strip 22 is arranged between the supporting wheel column 19 and the acute angle clamped by the bearing follower plate 4, an arc-shaped limiting slide hole 23 which is matched with the shape of the buffer spring strip 22 is arranged on the upper portion of the buffer spring strip 22, a lateral protruding column of the supporting wheel column 19 extends into the arc-shaped limiting slide hole 23, the bottom of the arc-shaped limiting slide hole 23 is arranged above the middle point of the buffer spring strip 22, so that the lateral protruding column of the supporting wheel column 19 falls to the bottom of the arc-shaped limiting slide hole 23 and can compress the buffer spring strip 22 when the supporting wheel column 19 rapidly falls under pressure.
The temporary connecting piece connected with the transverse telescopic tension rod 15 and the compression rod 9 is two openings 25 connected together through a connecting sheet 24, the two openings 25 are arranged at two ends of the connecting sheet 24, a square clamping strip 26 is arranged on the transverse telescopic tension rod 15, a cylindrical bulge 27 is arranged on the upper part of the compression rod 9, and when in use, the two openings 25 are respectively clamped on the square clamping strip 26 and the cylindrical bulge 27 to realize the connection of the transverse telescopic tension rod 15 and the compression rod 9; (square clamping strips are adopted on the transverse telescopic tension rod 15 to prevent the temporary connecting piece from rotating relative to the transverse telescopic tension rod 15, and one end of the connecting pressing rod 9 is required to be rotatable) the position of the cylindrical bulge 27 is above the fulcrum rod 17, and one or more cylindrical bulges 27 are arranged along the length direction of the pressing rod 9.
The telescopic pull rod 7, the compression rod 9 and the I-shaped follow-up tensioning piece are four groups, and each group is arranged by taking the upright post of the door-shaped frame 1 as a unit;
a follower roller 18 which is used for pushing against the pressing rod 9 when in use is arranged at the front end of the fulcrum bar 17.
When the circuit breaker is used, the binding band 3 is wound around the circuit breaker, the bearing follower plate 4 is pushed upwards to the bottom of the circuit breaker, the binding band 3 is tightened, the fixing sleeve 10 is sleeved on the vertical pipe 11 of the connecting flanges at two ends of the circuit breaker from the outer side, as shown in fig. 4, then the upper part of the pressing rod 9 is connected with the transverse telescopic tension rod 15, the lower part of the pressing rod 9 is hooked by the movable hook 8, then the vertical stretching rotation rod 16 is screwed, so that the upper part of the pressing rod 9 is pulled inwards by the transverse telescopic tension rod 15, namely, the left direction in fig. 4, the pressing rod 9 pulls out the telescopic tension rod 7, meanwhile, the supporting wheel column 19 is lifted and props against the bottom of the circuit breaker until the bottom of the circuit breaker is tightly pressed, the vertical stretching rotation of the rotation rod 16 is stopped, the circuit breaker is fixed, and after the fixing, the circuit breaker is not swung in the falling process, the safety performance is improved, because if only 3, the whole circuit breaker possibly swings, the damage to equipment and danger are easily caused, and then when the circuit breaker is lowered, the whole bearing follower plate 4, the work piece and the tightening part are connected with the lower part; when the tie 3 on one side breaks suddenly, one end of the breaker is pressed down rapidly, at the moment, one end of the supporting follower plate 4 receives a large force rapidly to generate inclination trend, and because the follower gears 5 are of precise structures meshed with racks, when the supporting follower plate 4 generates inclination trend, the forces received by the follower gears 5 on two sides are uneven, so that the meshing between the follower gears 5 and the racks is misplaced to cause the gears to rotate abnormally so as to complete locking, and the breaker is prevented from directly falling to cause damage to equipment and even personnel; and assuming that the accidental force is too large, the supporting wheel column 19 can increase the pulling force to the movable hook 8 and the pressing rod 9, one end of the movable hook 8 or the pressing rod 9 is broken or the connection between the movable hook 8 and the pressing rod 9 is broken, so that the supporting wheel column 19 is pressed down, the buffer spring strip 22 below can realize the buffer function, the circuit breaker is further protected, and the downward pressure is discharged to the greatest extent.
Application conditions and achievements;
the comprehensive large overhaul of the 500kV Pu He transformer substation adopts a portal frame sedimentation breaker method to treat the leakage defect 15 of the SF6 of the breaker, greatly shortens the construction period and the power failure range, reduces the power failure time and the workload, reduces the construction difficulty, does not use a crane during the defect treatment period, does not disassemble secondary wiring of a current transformer and other leakage-free air chamber components, and avoids the operation risk. The breaker processed by the method has no leakage phenomenon through detection of professional instruments, other parts are not damaged and casualties caused by disassembly operation of the breaker are avoided, meanwhile, the door-shaped framework, the chain hoist, the jack and other instruments can be repeatedly used, two sets of instruments are simultaneously used in the whole overhaul operation, the working efficiency is greatly improved, the cost is saved, and therefore, the method can be proved to be remarkable in effect.
Claims (7)
1. The method for treating the leakage defect of HGIS equipment by using a gate-type framework settlement breaker method is characterized by comprising the following steps of: the method comprises the following steps:
(1) After power failure, gas recovery is needed before the disassembly of the gas chamber, and the disassembly gas chamber is required to be vacuumized and then reduced to zero gauge pressure; adjacent air chambers of the disassembly air chamber need to be depressurized to 0.2Mpa; the air pressure of the other air chambers is unchanged and is the rated pressure;
(2) Before overhauling the circuit breaker, the bracket is required to reliably support equipment above the circuit breaker;
(3) Disassembling the circuit breaker: after the two works are completed, the vacuum state of the disassembling air chamber is released, and the connecting cable and the meter valve of the breaker mechanism are disassembled for assembly; winding a circuit breaker by using a lifting rope, lifting the circuit breaker by using a chain block, enabling the lifting rope to be in a tight state, loosening a connecting nut of the circuit breaker and a current transformer, and adjusting the chain block to enable bolt gaps penetrating through flange screw holes of the current transformer to be uniform; loosening the bolts of the breaker support, and detaching the breaker support; adjusting a chain block to stably place the circuit breaker on the ground;
(4) The basin-type insulator at the fault part of the circuit breaker is disassembled, the basin-type insulator is replaced for assembly, the sealing part of the tank body is overhauled and cleaned, the new basin-type insulator is assembled on the circuit breaker after dampproof and dustproof treatment is carried out in the operation process, and meanwhile, the rear cover is opened to clean the inside of the circuit breaker;
(5) Circuit breaker recovery: readjusting a lifting rope and a chain block, and horizontally lifting the circuit breaker; cleaning the upper surface of a basin-type insulator of the circuit breaker and a butt flange opening of a current transformer, and wrapping the basin-type insulator by using clean plastic cloth; butting the circuit breaker with a current transformer from bottom to top, and rolling up and taking down plastic cloth on the basin-type insulator along one direction when the basin-type insulator is close to the CT flange; the circuit breaker is in butt joint with the current transformer; adjusting a guide chain, slowly lifting the breaker tank body upwards, and rotating the tooling clamp during the lifting process to ensure that the tooling clamp keeps a clamping flange state until the butt flange is closed; after the butt flanges are folded, two centering nuts are used in the 180-degree direction of the flanges, the butt flanges are screwed in a centering mode, and then the flanges are screwed by assembling the nuts;
(6) Adjusting to enable the new breaker to be kept at the same height after assembly and before disassembly; replacing the adsorbents of the isolation air chambers at the two sides of the circuit breaker, vacuumizing and performing subsequent air charging operation;
in the step (2), the supporting point is positioned at the bottom of the vertical flange of the isolating switch tank body; the bracket adopts a door-shaped structure;
the bracket with the door-shaped structure comprises a door-shaped frame (1), two chain blocks (2) symmetrically arranged on a top cross beam of the door-shaped frame (1), and a binding belt (3) connected to the bottoms of the two chain blocks (2);
the door-shaped frame (1) is of a structure formed by a cross beam and upright posts, a supporting follow-up plate (4) for supporting the circuit breaker in use is further arranged between the upright posts, four corners of the supporting follow-up plate (4) are respectively provided with a follow-up gear (5), the follow-up gears (5) extend into vertical sliding grooves (6) in the upright posts of the door-shaped frame (1) and are meshed with vertical racks fixed in the sliding grooves (6), and when the door-shaped frame is in use, the follow-up gears (5) are meshed with the vertical racks to move up and down along the vertical sliding grooves (6); the axial direction of the follow-up gear (5) is the same as the axial direction of the circuit breaker;
the two ends of the bearing follow-up plate (4) are inserted with a telescopic pull rod (7), one end of the telescopic pull rod (7) extends into the bearing follow-up plate (4) and can be in drawing and inserting movement relative to the bearing follow-up plate (4), the other end of the telescopic pull rod (7) is connected with a movable hook (8), the movable hook (8) is hooked on a fixed column at the bottom of the pressing rod (9) when in use, the top end of the pressing rod (9) is movably connected with a fixed sleeve (10), and a stand pipe (11) of a connecting flange at two ends of the circuit breaker is sleeved outside the fixed sleeve (10) when in use;
the upright post of the door-shaped frame (1) is also provided with an I-shaped follow-up tensioning piece, the follow-up tensioning piece comprises an upper tensioning mechanism and a lower supporting mechanism, the upper tensioning mechanism is arranged above the lower supporting mechanism, and the upper tensioning mechanism is connected with the lower supporting mechanism through a connecting post (14); the upper tensioning mechanism comprises a shell and two tensioning piece gears (12) arranged in the shell, and the two tensioning piece gears (12) are respectively meshed with fixed racks on two sides of the upright post of the door-shaped frame (1) and can be meshed with the racks to move up and down; the lower supporting mechanism comprises a shell and two supporting piece gears (13) arranged in the shell, and the two supporting piece gears (13) are respectively meshed with fixed racks on two sides of a column of the gate-type frame (1) and can be meshed with the racks to move up and down; the outer side of the upper tensioning mechanism is provided with a tensioner, and the tensioner comprises a transverse telescopic tensioning rod (15) with one end extending into the upper tensioning mechanism shell and a vertical telescopic rotating rod (16) for controlling the telescopic action of the transverse telescopic tensioning rod (15), and the other end of the transverse telescopic tensioning rod (15) is connected to the upper part of the pressing rod (9) through a temporary connecting piece; the lower end of the vertical stretching rotating rod (16) stretches into the shell and is vertical to the transverse stretching tensioning rod (15), the part of the transverse stretching tensioning rod (15) stretching into the shell is of a worm structure, the part of the vertical stretching rotating rod (16) stretching into the shell is provided with a worm wheel meshed with the worm structure of the transverse stretching tensioning rod (15), and the worm wheel and the vertical stretching rotating rod (16) jointly rotate to control stretching of the transverse stretching tensioning rod (15);
the outer side of the lower supporting mechanism is provided with a fulcrum rod (17) which is propped against the middle part or the position below the middle part of the compression rod (9) when in use, so that the compression rod (9) forms a lever structure, and when in use, the upper part of the compression rod (9) is tensioned by the telescopic tensioning rod (15) to tighten the fixed sleeve (10) and press the compression rod (9);
still be provided with support wheel post (19) on bearing follower (4), the top of support wheel post (19) is for supporting elastic roller (20) of circuit breaker bottom when using, support wheel post (19) bottom is provided with drive gear (21), the part that telescopic link (7) stretched into bearing follower (4) is provided with the rack, this rack and drive gear (21) meshing, when telescopic link (7) outwards draws, support wheel post (19) rotate until elastic roller (20) withstands circuit breaker bottom.
2. The door frame settlement breaker method of claim 1 wherein the HGIS equipment leakage defect method is handled by: and (3) when the connecting nut of the breaker and the current transformer is loosened, firstly, loosening the nut on the upper surface of the basin-type insulator flange.
3. The door frame settlement breaker method of claim 1 wherein the HGIS equipment leakage defect method is handled by: when the circuit breaker is in butt joint with the current transformer in the step (5), the conductor is firstly led into the contact at the basin-type insulator of the circuit breaker, then the guide sleeve is led into the screw hole of the flange of the current transformer, and after the guide sleeve is led into the screw hole, the flange of the circuit breaker and the flange of the current transformer are clamped by using the tooling clamp.
4. The door frame settlement breaker method of claim 1 wherein the HGIS equipment leakage defect method is handled by: in the step (6), the vacuum degree change of the air chamber is recorded when the disassembled air chamber is vacuumized; pumping the pressure to below 40Pa, continuously pumping for 0.5 hour, and stopping the vacuum pump to stand for two hours; re-measuring the vacuum degree to be not more than 133Pa, and obtaining the qualified product; when in inflation, the gas bottle adopts inverted inflation, the bottom of the gas bottle is higher than the bottle mouth, the on-site humidity is not more than 80%, and the purity and the moisture content are tested after the gas bottle is stationary; and recovering the control cable, and removing the support of the tank above the circuit breaker.
5. The door frame settlement breaker method of claim 1 wherein the HGIS equipment leakage defect method is handled by: when the elastic roller (20) props against the bottom of the circuit breaker, the supporting roller (19) is in a non-vertical state, a buffer elastic strip (22) is arranged between the supporting roller (19) and an acute angle clamped by the supporting follow-up plate (4), an arc-shaped limiting sliding hole (23) which is adaptive to the shape of the buffer elastic strip (22) is formed in the upper portion of the buffer elastic strip (22), a protruding column on the lateral side of the supporting roller (19) stretches into the arc-shaped limiting sliding hole (23), and the bottom of the arc-shaped limiting sliding hole (23) is above the middle point of the buffer elastic strip (22).
6. The door frame settlement breaker method of claim 1 wherein the HGIS equipment leakage defect method is handled by: the temporary connecting piece connected with the transverse telescopic tension rod (15) and the compression rod (9) is two openings (25) connected together through a connecting piece (24), the two openings (25) are arranged at two ends of the connecting piece (24), square clamping strips (26) are arranged on the transverse telescopic tension rod (15), cylindrical protrusions (27) are arranged on the upper portion of the compression rod (9), and when the transverse telescopic tension rod is used, the two openings (25) are respectively clamped on the square clamping strips (26) and the cylindrical protrusions (27) to realize connection of the transverse telescopic tension rod (15) and the compression rod (9); the cylindrical protrusions (27) are positioned above the fulcrum bar (17), and one or more cylindrical protrusions (27) are arranged along the length direction of the pressing bar (9).
7. The door frame settlement breaker method of claim 1 wherein the HGIS equipment leakage defect method is handled by: the telescopic pull rod (7), the compression rod (9) and the I-shaped follow-up tensioning piece are four groups, and each group is arranged by taking the upright post of the door-shaped frame (1) as a unit;
the front end of the fulcrum rod (17) is provided with a follow-up roller (18) which is propped against the pressing rod (9) when in use.
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| CN201710846861.5A CN107895900B (en) | 2017-09-19 | 2017-09-19 | Method for treating leakage defect of HGIS equipment by adopting gate-type framework settlement breaker method |
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| CN111404066B (en) * | 2020-04-23 | 2022-01-21 | 中国长江电力股份有限公司 | GIS body equipment technical transformation construction method |
| CN113964707A (en) * | 2021-10-19 | 2022-01-21 | 上海宝冶冶金工程有限公司 | Extension method of box-type GIS busbar barrel |
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