CN114123028B - Method for replacing triple strain insulator string - Google Patents
Method for replacing triple strain insulator string Download PDFInfo
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- CN114123028B CN114123028B CN202111404488.0A CN202111404488A CN114123028B CN 114123028 B CN114123028 B CN 114123028B CN 202111404488 A CN202111404488 A CN 202111404488A CN 114123028 B CN114123028 B CN 114123028B
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- Prior art keywords
- clamp
- pulley
- cross arm
- insulator
- insulator string
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000012211 strain insulator Substances 0.000 title abstract description 18
- 239000012212 insulator Substances 0.000 claims abstract description 78
- 238000004873 anchoring Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000013011 mating Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Landscapes
- Electric Cable Installation (AREA)
Abstract
The invention provides a replacement method of an insulator string, which comprises the steps of removing a lead end equalizing ring of the insulator string, replacing and anchoring the equalizing ring, and installing a lead end clamp and a cross arm end clamp; tightening the hydraulic screw rod to pre-tighten the insulating pull rod; respectively hoisting a front clamp and a rear clamp of the auxiliary closed clamp; then, the hydraulic tightener is tightened until the insulator string is loosened, and the load is transferred to the insulating pull rod; tightening the lengthened double-head screw rod, and sequentially removing five insulators at the lead end; the bowl head pulley is connected with the corresponding insulator, the cross plate pulley is matched with the cross hanging plate, and the insulating rope penetrates through the steering pulley to be guided to the ground; then tightening the insulating rope of the pulley unit, and removing the lengthened double-head screw rod and the auxiliary closed type rear clamp; the insulator string is disconnected from the cross arm, and the insulator string is placed on the ground by using the insulating rope and the pulley block; and after the zero-value insulator and the low-value insulator are replaced, the reverse operation is performed, the replacement of the whole triple strain insulator string is completed, the operation is simple, and the replacement efficiency is high.
Description
Technical Field
The invention relates to the technical field of extra-high voltage transmission line overhaul, in particular to a method for replacing a triple strain insulator string.
Background
The safe and stable operation of the ultra-high voltage transmission line is related to the safety of the power grid. When the power grid normally operates, the occurrence of low-value zero-value insulators is unavoidable, and the replacement work of the low-value zero-value insulators is an important component part of unit safety maintenance work, wherein the insulator replacement fixture and the operation method are particularly important.
At present, for the strain insulator string of the ultra-high voltage transmission line, each string of insulator string is provided with 74 pieces of insulators, the length is 15170mm, and the total length is 17100mm by adding a connecting fitting. When the low-value zero-value insulator appears, the operation method of replacing the single insulator by the closed fixture is mainly adopted, and the whole string of insulator replacement operation method is not adopted, so that the insulator replacement operation is complex, and the replacement efficiency is low.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for replacing a triple strain insulator string, which solves the technical problem that the whole string of insulators of the triple strain insulator string cannot be replaced.
Specifically, the invention provides a replacement method of an insulator string, which is used for replacing the insulator string in the whole string and comprises the following steps:
s1: dismantling the equalizing ring at the lead end of the insulator string and transposing and anchoring the equalizing ring;
s2: hanging an insulating pulley block, threading an insulating rope, and hoisting a wire end fixture; installing a wire end fixture on the parallel hanging plate bolt;
s3: hoisting a cross arm end clamp, and installing the cross arm end clamp on a cross arm side traction plate: the clamping device at the cross arm end and the traction plate at the cross arm side are connected into a whole by bolts;
s4: respectively lifting the hydraulic tightener and the insulating pull rod, connecting the hydraulic tightener with the wire end clamp and the cross arm end clamp, and tightening the hydraulic screw rod to pre-tighten the insulating pull rod;
s5: respectively hoisting a front clamp and a rear clamp of the auxiliary closed clamp;
s6: checking each connecting point to confirm that the connection is not wrong;
s7: tightening the hydraulic tightener to enable the lead end clamp, the cross arm end clamp and the insulating pull rod to bear force until the insulator string is loosened, and transferring the load to the insulating pull rod;
s8: tightening the lengthening double-head screw rod, and sequentially removing insulators from the (1) th piece to the (5) th piece of the lead end;
s9: a turning insulating pulley is hung at the corresponding position of the cross arm; the bowl head pulley and the cross plate pulley form a pulley group by using an insulating rope, the pulley group is lifted to the side of a lead, the bowl head pulley is connected with the insulator of the (6), the cross plate pulley is matched with the cross hanging plate, and the insulating rope passes through the steering pulley and is guided to the ground;
s10: tightening the insulating rope of the pulley unit, and removing the lengthened double-head screw rod and the auxiliary closed clamp rear clamp;
s11: the insulator string is disconnected from the cross arm, and the insulator string is placed on the ground by using the insulating rope and the pulley block;
s12: after the zero-value insulator and the low-value insulator are replaced, the pulley blocks consisting of the auxiliary closed type clamp front clamp, the bowl head pulley and the cross plate pulley are connected with the insulator string, and the replacement work of the whole triple strain insulator string is completed through reverse operation from the step S11 to the step S1.
Preferably, the step S5 further includes:
the auxiliary closed type rear clamp is arranged on a steel cap of a wire end (6) insulator, and is connected with an auxiliary closed type rear clamp and a wire end clamp by a lengthening double-head screw rod, and the lengthening double-head screw rod is pre-tightened;
the auxiliary closed type clamp front clamp is arranged on a steel cap of an insulator (2) at the cross arm end, and U-shaped hanging rings are arranged at the two ends of the front clamp;
and a turning insulating pulley is hung at the corresponding position of the cross arm, the U-shaped hanging ring is connected by an insulating rope, and the insulating rope penetrates through the turning pulley to be guided to the ground.
Preferably, the wire end clamp is a turning plate clamp and comprises a turning plate clamp main body, a rotating shaft, a turning plate and a groove part.
Preferably, the turning plate can turn around the rotating shaft, the groove part is positioned at the center of the turning plate clamp main body and the turning plate is close to the rotating shaft and is used for being matched and connected with the parallel hanging plate bolt, the parallel hanging plate and the cross hanging plate.
Preferably, the cross arm end clamp is an airfoil clamp and comprises a central clamping groove and two wing parts.
Preferably, the central part clamping groove is matched with the cross arm side traction plate, the two wing parts are symmetrically distributed on two sides of the central part, and the cross arm end clamp is connected with the wire end clamp sequentially through the hydraulic tightener and the insulating pull rod.
Preferably, the cross arm end clamp, the wire end clamp, the insulating pull rod and the hydraulic tightener are used as main stress tools for bearing the tension of the wires.
Preferably, the auxiliary closed type rear clamp, the auxiliary closed type front clamp, the lengthened double-head screw rod, the insulating pulley and the insulating rope are used for being matched with the main clamp to realize replacement of the whole string of insulators.
Preferably, in the operation process, the turning plate is opened by removing the nut, the groove part is sleeved outside the hexagonal head of the bolt, and the wire end clamp can be opened.
Preferably, in the operation process, the turnover plate is closed, the groove part is sleeved outside the hexagonal head of the bolt, and the nut is screwed down, so that the wire end clamp can be closed.
According to the method for replacing the triple strain insulator string, disclosed by the invention, the whole insulator string of the triple strain insulator string is replaced, the operation is simple, and the replacement efficiency is high.
Drawings
Fig. 1 is a front view of a 420kN triple strain insulator string.
Fig. 2 is a top view of a 420kN triple strain insulator string.
Fig. 3 is a diagram of a tool installation a for replacing a 420kN triple strain insulator string according to the present invention.
Fig. 4 is a diagram B of the tool for replacing a 420kN triple strain insulator string according to the present invention.
Fig. 5 is a front view of a cross arm end airfoil card of the present invention.
Figure 6 is a side view-cross-sectional view of a cross arm end airfoil card of the present invention.
Fig. 7 is a schematic view of the opened state of the wire end flap card of the present invention.
Fig. 8 is a schematic view of the wire end flap card of the present invention in a closed state.
Fig. 9 is a top view of the wire end flap card of the present invention in a closed position-a schematic view of the coupling position.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
Fig. 1 shows a ± 800kV line 420kN triple hanging strain insulator string, the insulator string spacing is 650mm, each string of insulator string has 74 pieces of 420kN insulators, except for the connection hardware fitting, and the length is 15170mm. The connection length of the insulator is 205mm, and the diameter of the porcelain skirt is 400mm.
Fig. 1 and 2 show an assembly drawing of a +/-800 kV line 420kN triple-hanging strain insulator string hardware fitting, the insulator string spacing is 650mm, and each string of insulator string is provided with 420kN insulator 74 pieces and 15170mm in length except for a connecting hardware fitting. The connection length of the insulator is 205mm, and the diameter of the porcelain skirt is 400mm.
As shown in fig. 3 and 4, the invention provides a triple strain insulator string replacement tool, which comprises a main fixture and an auxiliary tool.
Wherein the main fixture includes: the cross arm end clamp 8, the wire end clamp 16, the insulating pull rod 10 and the hydraulic tightener 9 are used as main stress tools for bearing the wire tension.
The cross arm end clamp 8 is an airfoil clamp, and as shown in fig. 5 and 6, comprises a central clamping groove 32 and two wing parts 33. The central part clamping groove 32 is matched with the cross arm side traction plate 1, and the two wing parts are symmetrically distributed on two sides of the central part.
The wire end fixture 16 is a board turning clamp, as shown in fig. 7, 8 and 9, and comprises a board turning clamp main body 25, a rotating shaft 26, a board turning plate 27 and a groove part 34, wherein the board turning plate 27 can turn around the rotating shaft 26, and the groove part 34 is positioned at the center of the board turning clamp main body and the position of the board turning plate 27 close to the rotating shaft 26 and is used for being matched and connected with the parallel hanging plate bolt 6, the parallel hanging plate 7 and the cross hanging plate 5.
Fig. 7 shows the wire end clamp in an open state, and the wire end clamp can be opened by removing the nut 28, opening the turning plate 27, and sleeving the main body groove 34 outside the hexagonal head of the bolt 6.
Fig. 8 shows the wire end clamp in a closed state, the turning plate 27 is closed, the groove part 34 of the turning plate is sleeved outside the hexagonal head of the bolt 6, and the nut 28 is screwed tightly, so that the wire end clamp can be closed.
The cross arm end clamp is connected with the wire end clamp sequentially through the hydraulic tightener and the insulating pull rod to form the main stress clamp.
Referring to fig. 3-4, the auxiliary tool comprises an auxiliary closed type card rear card 12, an auxiliary closed type card front card 13, an elongated double-headed screw 14, an elongated joint 15, a special insulation pulley and an insulation rope, and is used for being matched with a main clamp to realize replacement of the whole string of insulators. Wherein the special insulation block comprises a bowl head block 21 and a cross plate block 20.
When the insulator string is required to be replaced, the auxiliary closed type clamp rear clamp is arranged on a sixth insulator steel cap at the lead end, the auxiliary closed type clamp rear clamp and the lead end clamp are connected through the lengthened double-end lead screw, and the lengthened double-end lead screw is pre-tensioned. The auxiliary closed type front clamp is arranged on a steel cap of a 2 nd insulator at the end of the cross arm, and U-shaped hanging rings are arranged at the two ends of the front clamp.
And the hydraulic tightener is tightened to enable the lead end clamp, the cross arm end clamp and the insulating pull rod to bear force until the insulator string is loosened, and the load is transferred to the insulating pull rod. And (5) tightening the lengthened double-head screw rod, and sequentially removing insulators from the (1) th piece to the (5) th piece of the lead end.
The bowl head pulley and the cross plate pulley form a pulley group by using an insulating rope, the pulley group is lifted to the side of a lead, the bowl head pulley is well connected with the insulator (6), the cross plate pulley is matched with the cross hanging plate, and the insulating rope penetrates through the steering pulley and is guided to the ground.
The insulator string is guided to the ground through the insulating rope, so that the whole string of the triple hanging tension insulator string is detached.
Based on the replacement tool, the invention provides a replacement method of an insulator string, which is used for replacing the insulator string in the whole string and comprises the following steps:
s1: dismantling the equalizing ring at the lead end of the insulator string and transposing and anchoring the equalizing ring;
s2: hanging an insulating pulley block, threading an insulating rope, and hoisting a wire end fixture; installing wire end clamps onto parallel hanger plate bolts as shown in fig. 2;
s3: hoisting a cross arm end clamp, and installing the cross arm end clamp on a cross arm side traction plate: the cross arm end clamp and the cross arm side traction plate are connected into a whole by bolts, as shown in figure 2;
s4: respectively lifting the hydraulic tightener and the insulating pull rod, connecting the hydraulic tightener with the wire end clamp and the cross arm end clamp, and tightening the hydraulic screw rod to enable the insulating pull rod to be pre-tightened by about 5 kN;
s5: the front clamp and the rear clamp of the auxiliary closed clamp are respectively lifted,
the auxiliary closed type rear clamp is arranged on a sixth insulator steel cap of the lead end, and an elongated double-headed lead screw is connected with the auxiliary closed type rear clamp and the lead end clamp, so that the elongated double-headed lead screw is pre-tensioned, as shown in fig. 2;
the auxiliary closed type clamp front clamp is arranged on a 2 nd insulator steel cap at the cross arm end, and U-shaped hanging rings are arranged at the two ends of the front clamp; a turning insulating pulley is hung at the corresponding position of the cross arm, a U-shaped hanging ring is connected by an insulating rope, and the insulating rope penetrates through the turning pulley to be guided to the ground;
after the above steps are completed, checking each connection point again to confirm that connection is error-free.
S5: tightening the hydraulic tightener to enable the lead end clamp, the cross arm end clamp and the insulating pull rod to bear force until the insulator string is loosened, and transferring the load to the insulating pull rod;
s6: tightening the lengthened double-head screw rod, and sequentially removing insulators from the (1) th piece to the (5) th piece of the lead end, as shown in fig. 2;
s7: a turning insulating pulley is hung at the corresponding position of the cross arm; the bowl head pulley and the cross plate pulley form a pulley group by using an insulating rope, the pulley group is lifted to the side of a lead, the bowl head pulley is connected with the insulator of the (6), the cross plate pulley is matched with the cross hanging plate, and the insulating rope passes through the steering pulley and is guided to the ground;
s8: tightening the insulating rope of the pulley unit, and removing the lengthened double-head screw rod and the auxiliary closed clamp rear clamp;
s9: and (3) disconnecting the insulator string from the cross arm, and slowly placing the insulator string to the ground by using the insulating rope and the pulley block.
S10: after the zero-value insulator and the low-value insulator are replaced, the pulley blocks consisting of the auxiliary closed type clamp front clamp, the bowl head pulley and the cross plate pulley are connected with the insulator string, and the whole string replacement work of the 420kN triple strain insulator string is completed through reverse operation from the step S10 to the step S1.
While the applicant has described and illustrated the examples of the present invention in detail with reference to the drawings of the specification, it should be understood by those skilled in the art that the above examples are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, but not limiting the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.
Claims (5)
1. A method for replacing an insulator string for an entire string, the method comprising the steps of:
s1: dismantling the equalizing ring at the lead end of the insulator string and transposing and anchoring the equalizing ring;
s2: hanging an insulating pulley block, threading an insulating rope, and hoisting a wire end fixture; installing a wire end fixture on the parallel hanging plate bolt;
s3: hoisting a cross arm end clamp, and installing the cross arm end clamp on a cross arm side traction plate: the clamping device at the cross arm end and the traction plate at the cross arm side are connected into a whole by bolts;
s4: respectively lifting the hydraulic tightener and the insulating pull rod, connecting the hydraulic tightener with the wire end clamp and the cross arm end clamp, and tightening the hydraulic screw rod to pre-tighten the insulating pull rod; the cross arm end clamp is connected with the wire end clamp sequentially through the hydraulic tightener and the insulating pull rod to form a main stress clamp for bearing the tension of the wire;
s5: respectively hoisting an auxiliary closed type front clamp and an auxiliary closed type rear clamp; the auxiliary closed type clamp front clamp is arranged on a steel cap of an insulator (2) at the cross arm end, and U-shaped hanging rings are arranged at the two ends of the front clamp; the auxiliary closed type clamp rear clamp is arranged on a steel cap of a wire end (6) insulator, an elongated double-head screw rod is connected with the auxiliary closed type clamp rear clamp and a wire end clamp, the elongated double-head screw rod is pre-tightened, and a first steering pulley is hung at a corresponding position of a cross arm; the U-shaped hanging ring is connected by a first insulating rope, and the first insulating rope passes through the first steering pulley;
s6: checking each connecting point to confirm that the connection is not wrong;
s7: tightening the hydraulic tightener to enable the wire end clamp, the cross arm end clamp and the insulating pull rod to bear force until the insulator string is loosened, and transferring the load to the insulating pull rod;
s8: tightening the lengthening double-head screw rod, and sequentially removing insulators from the (1) th piece to the (5) th piece of the lead end;
s9: a second steering pulley is hung at the corresponding position of the cross arm; the bowl head pulley and the cross plate pulley form a pulley block by using a pulley block insulating rope, the pulley block is lifted to the side of a lead, the bowl head pulley is connected with the (6) th insulator, the cross plate pulley is matched with a connecting hardware cross hanging plate of an insulator string, and the pulley block insulating rope penetrates through a second steering pulley and is guided to the ground;
s10: tightening the insulating rope of the pulley unit, and removing the lengthened double-head screw rod and the auxiliary closed clamp rear clamp;
s11: the connection of the insulator string and the cross arm is disconnected, and the insulator string is placed on the ground by utilizing the first insulating rope and the pulley block;
s12: after the zero-value insulator and the low-value insulator are replaced, the auxiliary closed type clamp front clamp and the pulley block consisting of the pulley block insulating rope, the bowl head pulley and the cross plate pulley are connected with the insulator string, and the replacement of the whole string of the triple tension insulator string is completed through reverse operation from the step S11 to the step S1.
2. The method of claim 1, wherein the wire end clamp is a flap clamp comprising a flap clamp body, a shaft, a flap and a groove, wherein the flap is turned around the shaft, and the groove is located at the center of the flap clamp body and near the shaft for mating connection with parallel-hanging-plate bolts, parallel-hanging plates and cross-hanging plates.
3. The method of claim 2, wherein the cross arm end clamp is an airfoil clamp comprising a central portion clamp slot and two wing portions, the central portion clamp slot being mated with the cross arm side traction plate, the two wing portions being symmetrically disposed on either side of the central portion clamp slot.
4. A method according to claim 3, wherein the wire end clamp is opened during operation by removing the nut to open the flap.
5. The method of claim 4, wherein the wire end clamp is closed during operation by closing the flap, fitting the recess over the hexagonal head of the bolt, and tightening the nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111404488.0A CN114123028B (en) | 2021-11-24 | 2021-11-24 | Method for replacing triple strain insulator string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111404488.0A CN114123028B (en) | 2021-11-24 | 2021-11-24 | Method for replacing triple strain insulator string |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114123028A CN114123028A (en) | 2022-03-01 |
| CN114123028B true CN114123028B (en) | 2024-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111404488.0A Active CN114123028B (en) | 2021-11-24 | 2021-11-24 | Method for replacing triple strain insulator string |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114123028B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163827A (en) * | 2011-01-30 | 2011-08-24 | 江苏捷凯电力器材有限公司 | Strain insulator string for multi-division transmission line |
| CN202050191U (en) * | 2011-05-03 | 2011-11-23 | 刘治勇 | Clamp for changing strain insulator string |
| JP2012244827A (en) * | 2011-05-23 | 2012-12-10 | Kyushu Electric Power Co Inc | Electric wire tension reduction apparatus and electric wire tension reduction construction method |
| CN104201602A (en) * | 2014-07-25 | 2014-12-10 | 国网上海市电力公司 | Charged replacement method for whole string of insulators of ultra-high-voltage transmission line, and hardware fitting thereof |
| CN204089020U (en) * | 2014-07-04 | 2015-01-07 | 中国南方电网有限责任公司超高压输电公司南宁局 | The π type special mould clamp of charged for replacement single-unit porcelain long rod insulator |
-
2021
- 2021-11-24 CN CN202111404488.0A patent/CN114123028B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163827A (en) * | 2011-01-30 | 2011-08-24 | 江苏捷凯电力器材有限公司 | Strain insulator string for multi-division transmission line |
| CN202050191U (en) * | 2011-05-03 | 2011-11-23 | 刘治勇 | Clamp for changing strain insulator string |
| JP2012244827A (en) * | 2011-05-23 | 2012-12-10 | Kyushu Electric Power Co Inc | Electric wire tension reduction apparatus and electric wire tension reduction construction method |
| CN204089020U (en) * | 2014-07-04 | 2015-01-07 | 中国南方电网有限责任公司超高压输电公司南宁局 | The π type special mould clamp of charged for replacement single-unit porcelain long rod insulator |
| CN104201602A (en) * | 2014-07-25 | 2014-12-10 | 国网上海市电力公司 | Charged replacement method for whole string of insulators of ultra-high-voltage transmission line, and hardware fitting thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114123028A (en) | 2022-03-01 |
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