CN111216068A - Device for assisting in dismounting insulator and hardware fitting in transformer substation in electrified mode - Google Patents
Device for assisting in dismounting insulator and hardware fitting in transformer substation in electrified mode Download PDFInfo
- Publication number
- CN111216068A CN111216068A CN202010114991.1A CN202010114991A CN111216068A CN 111216068 A CN111216068 A CN 111216068A CN 202010114991 A CN202010114991 A CN 202010114991A CN 111216068 A CN111216068 A CN 111216068A
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- length
- fixture
- insulator
- locking function
- arm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
-
- 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 utility model provides a device that is used for electrified supplementary dismouting transformer substation inner insulator and gold utensil, belongs to insulator, gold utensil dismouting appurtenance technical field. The fixture is used for clamping a safe part of an insulator string so as to keep an electrical safety distance between a device for dismounting the insulator and hardware fittings in the transformer substation and a live wire connected with the insulator string; the fixture fixing component comprises a length-adjusting draw arm with a locking function, the length-adjusting draw arm with the locking function is used for drawing the fixture to move in a movable space, when the length-adjusting draw arm with the locking function is in an extending state, the fixture can clamp a safe part of an insulator string, and when the length-adjusting draw arm with the locking function is in a retracting state, a fitting connected with the insulator string can be in a non-bearing state. The replacement operation of the insulator and the hardware fitting in the transformer substation can be assisted by maintenance personnel at the ground potential.
Description
Technical Field
The invention relates to an auxiliary tool for dismounting insulators and hardware fittings, in particular to a device for assisting dismounting insulators and hardware fittings in a transformer substation in a live-line manner, which can replace the insulators or the hardware fittings which do not meet the stress standard under the condition of live-line operation.
Background
Under the influence of severe weather such as ice, snow, strong wind and the like, phenomena such as wind vibration, galloping, ice (snow) removal jumping and the like easily occur on an overhead line which is in service in a field open environment, and dynamic impact load generated by the phenomena is applied to a fixed line rod through movable connecting parts such as insulators, hardware fittings and the like, so that the movable connecting parts are damaged by fatigue, deformed by buckling or broken. If the movable connecting member is deformed by buckling or broken, the insulation and sealing performance of the movable connecting member are generally reduced or deteriorated.
Different from the on-line equipment maintenance operation, the equipment maintenance operation of the transformer substation adopts the power failure operation. The reason on one hand is that the line structure of the transformer substation is complex, and electrical equipment is generally arranged below the line, so that the space for safe operation is narrow due to the factors.
Patent document CN104505766A describes a tool and a method for replacing a 500kV strain insulator string in a substation in a live manner, and this document describes that an equipotential electrician is required to fixedly connect a yoke plate fixture to a yoke plate on the conductor side of the insulator string. The equipotential operation needs the equipotential electrician and the insulator chain lead to form the equipotential, that is, the equipotential electrician needs to fall on the live conductor. Because the strain insulator string is in flexible connection, when the equipotential electrician falls on the live wire, the extension form of the live wire can be changed, the safe operation space is not easy to control, and the technical scheme has higher requirements on the operation of the equipotential electrician. In addition, when the connecting portion of insulator and gold utensil need be changed because of not complying with the atress standard, there may be the situation that the dead weight of connecting portion can not bear the weight of equipotential electrician, consequently, this technical scheme is not suitable for the situation that the connecting portion of insulator and gold utensil needs to be changed.
Disclosure of Invention
The invention aims to provide a device for assisting in disassembling and assembling insulators and fittings in a transformer substation in a live-line manner, and the device is used for solving the technical problem that power failure operation is needed when insulators or fittings which do not meet stress standards in the transformer substation are maintained.
In order to solve the technical problems, the following technical scheme can be selected according to the needs:
a device for dismounting an insulator and a hardware fitting in a substation in an electrified auxiliary manner comprises a fixture fixing component and a fixture for clamping the insulator, wherein the fixture is used for clamping a safe part of an insulator string so as to keep an electrical safety distance between the device for dismounting the insulator and the hardware fitting in the substation and an electrified lead connected with the insulator string; the fixture fixing component comprises a length-adjusting draw arm with a locking function, the length-adjusting draw arm with the locking function is used for drawing the fixture to move in a movable space, when the length-adjusting draw arm with the locking function is in an extending state, the fixture can clamp a safe part of an insulator string, and when the length-adjusting draw arm with the locking function is in a retracting state, a fitting connected with the insulator string can be in a non-bearing state.
Preferably, the fixture holding assembly further comprises a fixing module, and the fixing module is in pulling connection or supporting connection with the length-adjustable pull arm with the locking function.
Furthermore, the fixture fixing assemblies are provided with two sets, the fixing module is rotatably connected with the length-adjusting draw arm with the locking function in the Z-axis direction, and the holding parts at the two ends of the fixture are respectively rotatably connected with the length-adjusting draw arms with the locking function of the two sets of fixture fixing assemblies in the Z-axis direction.
Still further, the fixture comprises a first holding part, a second holding part, a first clamping part and a second clamping part, one end of the first holding part is rotatably connected with the length-adjusting draw arm with the locking function of one fixture fixing component in the Z-axis direction, the other end of the first holding part is rotatably connected with the first clamping part and the second clamping part in the X-axis direction, one end of the second holding part is rotatably connected with the length-adjusting draw arm with the locking function of the other fixture fixing component in the Z-axis direction, and the other end of the second holding part is detachably connected with the first clamping part and the second clamping part in a locking manner.
Still further, the fixing module is an annular hoop.
Still further, the length-adjustable arm with the locking function selects at least one of a screw rod sleeve and a telescopic rod with a positioning pin.
Because the structure of the line in the transformer substation is complex, electrical equipment is generally arranged below the line, and the factors cause that the space of safe live working is narrow, the field defaults to power-off operation when the live equipment in the transformer substation is maintained. Although patent document CN104505766A also breakthroughs the use of equipotential replacement insulators in a live environment, it is not suitable for maintaining insulators or fittings in a substation that do not meet the stress standard. The invention adopts ground potential to replace the insulator (the front insulator or the front two insulators near one end of the hardware of the insulator string) or the hardware in a live environment, and maintains the insulator or the hardware which does not accord with the stress standard in the transformer substation under the condition of not applying extra tension to the insulator or the hardware which is added by equipotential personnel and maintenance equipment.
Compared with the prior art, the invention has the beneficial effects that:
1. when the insulator is clamped by the clamp, an electrical safety distance is still kept between the device for dismounting the insulator and the hardware in the transformer substation and the live wire connected with the insulator, so that the replacement operation of the insulator and the hardware in the transformer substation can be operated at the ground potential; the fixture fixing component is used for fixing the fixture, so that the fixture can be conveniently installed in the process of clamping the insulator by the fixture, and the insulator can be conveniently pulled in the process of replacing the insulator or hardware.
2. The fixed module can fix the length-adjustable arm stretcher with the locking function on an attachment, such as a portal frame type cross arm in a transformer substation, and can simplify other auxiliary equipment matched with the device.
3. The fixing module is rotatably connected with the length-adjusting draw arm with the locking function in the Z-axis direction, the holding parts at the two ends of the clamp are respectively rotatably connected with the length-adjusting draw arms with the locking function of the two sets of clamp fixing assemblies in the Z-axis direction, when the Z-axis direction is overlapped with the perpendicular line, the fixing module, the length-adjusting draw arm with the locking function and the clamp form supporting connection, and are matched with the length adjustment of the length-adjusting draw arm with the locking function, so that the assembly operation of the clamp and the insulator is easier.
4. The fixture comprises a first holding part, a second holding part, a first clamping piece and a second clamping piece, and when the other end of the second holding part is detachably connected with the first clamping piece and the second clamping piece in a locking mode, the degree of matching between the two fixture fixing assemblies and the fixture can be adjusted easily.
Drawings
Fig. 1 is a structural diagram of a device for disassembling and assembling insulators and fittings in a substation according to the present invention.
Fig. 2 is a reference diagram of a use state of the device for disassembling and assembling the insulator and the hardware in the substation according to the present invention.
The reference number indicates that 11-a fixing module, 12-a length-adjusting arm with a locking function, 2-a first set of fixture fixing components, 3-a second set of fixture fixing components, 4-a fixture, 51-a portal frame type cross arm, 52-a hardware fitting, 53-an insulator string and 54-a live wire.
Detailed Description
The present invention is described below in terms of embodiments in conjunction with the accompanying drawings to assist those skilled in the art in understanding and implementing the present invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.
Referring to fig. 2, in the prior art, a structure exists in a substation: the gantry type cross arm 51 is in flexible traction connection with one end of an insulator string 53 through a hardware fitting 52, and the other end of the insulator string 53 is in flexible traction connection with a live wire 54. The insulator string is used to form an electrical safety distance between the gantry-type cross arm 51 and the live wire 54. Generally, the gantry-type cross arm 51 includes a round bar beam. In practice, the insulator string is formed by flexibly connecting a plurality of insulators into a string, the length of the insulator string is longer than the electrical safety distance by at least one insulator, generally longer than the electrical safety distance by two insulators, and the redundant lengths are used for ensuring that the electrical safety distance can be formed between the gantry type cross arm 51 and the live wire 54 when an unexpected factor which is not considered by theory occurs.
First part of the invention
An apparatus for assisting in disassembling and assembling insulators and fittings in a substation in a live-line manner is disclosed, and referring to fig. 1-2, the apparatus comprises a fixture holding assembly and a fixture 52 for holding the insulators.
The clamp 52 is used for clamping a safe part of an insulator string 53 so as to keep an electrical safety distance between a device for assembling and disassembling insulators and fittings in a substation and a live wire 54. The safety position of the insulator string is generally determined according to the safety distance between the live wire 54 and the fixing rod, and generally, the clamp 52 can clamp one of the first two insulators or the first three insulators on the side, adjacent to the hardware, of the insulator string 53.
The fixture fixing component comprises an extension arm 12 with a locking function, an extension arm with a locking function and a device with an adjustable length, wherein the length of the device can be set at a target length as required after being adjusted to the target length. The length-adjustable draw arm 12 with the locking function is used for drawing the clamp 52 to move in the moving space, and when the length-adjustable draw arm 12 with the locking function is in an extending state, the clamp 52 can clamp the safety part of the insulator string 53, so that the assembly connection of the clamp 4 and the insulator string 53 can be realized; when the length-adjusting draw arm 12 with the locking function is in the retraction state, the hardware 52 connected with the insulator string 53 can be in a non-bearing state, so that the device for assisting in dismounting the insulator and the hardware in the transformer substation in an electrified manner can replace the hardware to realize the traction of the insulator string 53 and the electrified lead 54.
Example 1: an apparatus for assisting in disassembling and assembling insulators and fittings in a substation in a live-line manner is disclosed, and referring to fig. 1-2, the apparatus comprises a fixture holding assembly and a fixture 52 for holding the insulators.
The fixture holding assembly may include a fixing module 11 and an adjustable length arm 12 with a locking function, wherein the fixing module 11 is connected with the adjustable length arm 12 with the locking function in a pulling or supporting manner. When the device for assisting in dismounting the insulator and the hardware in the transformer substation in an electrified way needs to fix the transversely arranged insulator string, the fixing module 11 is in supporting connection with the length-adjusting draw arm 12 with a locking function. When the device for electrified auxiliary dismounting of the insulator and the hardware fittings in the transformer substation needs to hang the insulator string, the fixing module 11 is connected with the length-adjusting draw arm 12 with the locking function in a traction manner.
The fixing module 11 is not necessary, since the lengthening arm 12 with the locking function can be fixed to the work vehicle. The fixing module can be an annular hoop or a hook, wherein the annular hoop can be fixed on the round bar beam of the portal frame type cross arm, and the hook can rotate around the round bar beam when being hung on the round bar beam of the portal frame type cross arm. The length-adjustable arm can be a feed-through screw, a screw sleeve or a telescopic rod with a positioning pin, wherein the screw of the feed-through screw cannot be shortened, and the unused part of the feed-through screw extends backwards and possibly invades into the electrical safety distance of other live lines; and the unused parts of the screw rod sleeve and the telescopic rod with the positioning pin are arranged inside the two ends, so that the situation that the unused parts invade into the electrical safety distance of other electrified circuits is avoided.
The clamp 52 can be a circular hoop or an 8-shaped hoop.
Example 2: an apparatus for assisting in disassembling and assembling insulators and fittings in a substation in a live-line manner is disclosed, and referring to fig. 1-2, the apparatus comprises a fixture holding assembly and a fixture 52 for holding the insulators. As an improvement to embodiment 1, the present embodiment further adds the following technical features:
referring to fig. 1-2, there are two sets of fixture-holding assemblies, a first set of fixture-holding assemblies 2 and a second set of fixture-holding assemblies 3. In each set of fixture fixing assembly, a fixing module 11 is rotatably connected with a length-adjusting arm 12 with a locking function in the Z-axis direction, and holding parts at two ends of a fixture 4 are respectively rotatably connected with the length-adjusting arm with the locking function of the first set of fixture fixing assembly 2 and the length-adjusting arm with the locking function of the second set of fixture fixing assembly 3 in the Z-axis direction.
Still further, the fixture 4 includes a first holding portion, a second holding portion, a first clamping member and a second clamping member, one end of the first holding portion is rotatably connected to the length-adjustable arm with locking function of the first set of fixture holding component 2 in the Z-axis direction, the other end of the first holding portion is rotatably connected to the first clamping member and the second clamping member in the X-axis direction, one end of the second holding portion is rotatably connected to the length-adjustable arm with locking function of the second set of fixture holding component 3 in the Z-axis direction, and the other end of the second holding portion is detachably connected to the first clamping member and the second clamping member in a locking manner. Specifically, a first bolt hole can be formed in the second holding portion, a second bolt hole is formed in the corresponding position of the first clamping piece, a third bolt hole is formed in the corresponding position of the second clamping piece, the bolt connecting piece penetrates through the first bolt hole, the second bolt hole and the third bolt hole to connect the first clamping piece, the second holding portion and the second clamping piece in a detachable locking mode, and the first clamping piece and the second clamping piece are matched to clamp and fix the insulator.
In this embodiment, the length-adjustable arm extension with the locking function selects the screw sleeve.
Referring to fig. 2, when the cross arm insulator and the hardware are maintained by using the device for assisting in disassembling and assembling the insulator and the hardware in the transformer substation in a live-line manner, the insulator can be replaced in power failure or equipotential operation. The axis setting of the insulator that treats to be fixed is corresponded perpendicularly to the Z axle direction in this embodiment, fixes the fixed module of first set of centre gripping subassembly 2 on the cross arm, fixes the fixed module of second set of centre gripping subassembly 3 on the cross arm. The distance between the fixing module of the first set of clamping members 2 and the fixing module of the second set of clamping members 3 is preferably greater or less than the length of the clamp 4. The first holding part is restrained, the first clamping part and the second clamping part are prevented from swinging to stretch out of a safe operation space, the screw sleeve of the first set of clamping component 2 is adjusted to extend, and when the screw sleeve extends to the first clamping piece and the second clamping piece can clamp a target insulator, the first clamping piece and the second clamping piece are restrained to clamp the target insulator. Then adjust the screw sleeve extension of second set of centre gripping subassembly 3, when treating that the screw sleeve extension to the second portion of gripping can lock with first holder, second holder, with the second portion of gripping, first holder and second holder closure, first holder and second holder realize the effective centre gripping to the target insulator. The screw sleeve of the first set of clamping component 2 and the screw sleeve of the second set of clamping component 3 are synchronously adjusted to shorten, so that the screw sleeve of the first set of clamping component 2 and the screw sleeve of the second set of clamping component 3 pull the clamp, the insulator string 53 and the live wire 54 to move to the cross arm side in the shortening process, and when the connection between the hardware fitting and the insulator string is loosened to a redundant insulator capable of replacing the hardware fitting and the insulator string 53, the hardware fitting and the redundant insulator can be replaced or the connecting part can be reinforced. After the hardware fitting and the redundant insulator are replaced or the connecting part is reinforced, the screw sleeve of the first clamping assembly set 2 and the screw sleeve of the second clamping assembly set 3 are synchronously adjusted to extend, so that after the hardware fitting and the insulator string are stressed, the first clamping portion, the second clamping portion and the second holding portion can be separated, then the fixing module of the first clamping assembly set 2 is detached from the cross arm, and the fixing module of the second clamping assembly set 3 is detached from the cross arm. Note that the removal process still requires restraint of the movable parts of the devices for electrified auxiliary disassembly and assembly of the insulators and the fittings in the transformer substation, and the movable parts are prevented from extending out of the safe operation space.
Attention is paid to: if the distance between the fixing module of the first set of clamping assembly 2 and the fixing module of the second set of clamping assembly 3 is equal to the length of the fixture 4, and the length-adjustable draw arm with the locking function of the first set of clamping assembly 2 is the same as the length-adjustable draw arm with the locking function of the second set of clamping assembly 3, the device for assisting in dismounting the insulator and the hardware fitting in the substation in an electrified manner and the cross arm form a parallelogram, and because the parallelogram has instability, the electrified lead 54 and the insulator string 53 easily drive the device for assisting in dismounting the insulator and the hardware fitting in the substation in an electrified manner to swing upwards in the Y direction during operation, which may cause potential safety hazards. And when the distance between the fixing module of the first set of clamping assembly 2 and the fixing module of the second set of clamping assembly 3 is greater than or less than the length of the clamp 4, the hidden trouble can be overcome.
The invention is described in detail above with reference to the figures and examples. It should be understood that in practice it is not intended to be exhaustive of all possible embodiments, and the inventive concepts of the present invention are presented herein by way of illustration. Without departing from the inventive concept of the present invention and without any creative work, a person skilled in the art should, in all of the embodiments, make optional combinations of technical features and experimental changes of specific parameters, or make a routine replacement of the disclosed technical means by using the prior art in the technical field to form specific embodiments, which belong to the content implicitly disclosed by the present invention.
Claims (6)
1. The device for dismounting the insulator and the hardware in the transformer substation in the electrified auxiliary mode is characterized by comprising a fixture fixing component and a fixture for clamping the insulator, wherein the fixture is used for clamping a safe part of an insulator string so as to keep an electrical safety distance between the device for dismounting the insulator and the hardware in the transformer substation and an electrified lead connected with the insulator string; the fixture fixing component comprises a length-adjusting draw arm with a locking function, the length-adjusting draw arm with the locking function is used for drawing the fixture to move in a movable space, when the length-adjusting draw arm with the locking function is in an extending state, the fixture can clamp a safe part of an insulator string, and when the length-adjusting draw arm with the locking function is in a retracting state, a fitting connected with the insulator string can be in a non-bearing state.
2. The device for electrified auxiliary dismounting of insulators and fittings in substations according to claim 1, wherein the clamp holding assembly further comprises a fixing module, and the fixing module is in pulling connection or supporting connection with the length-adjustable pulling arm with locking function.
3. The device for electrified auxiliary dismounting and mounting of insulators and fittings in substations according to claims 1 or 2, wherein there are two sets of fixture holding assemblies, the fixing module is rotatably connected with the length-adjusting pulling arm with locking function in the Z-axis direction, and the holding parts at two ends of the fixture are respectively rotatably connected with the length-adjusting pulling arms with locking function of the two sets of fixture holding assemblies in the Z-axis direction.
4. The device for electrified auxiliary dismounting and mounting of insulators and fittings in a substation according to claim 3, wherein the clamp comprises a first holding portion, a second holding portion, a first clamping member and a second clamping member, one end of the first holding portion is rotatably connected with the length-adjusting arm with the locking function of one set of clamp holding assembly in the Z-axis direction, the other end of the first holding portion is rotatably connected with the first clamping member and the second clamping member in the X-axis direction, one end of the second holding portion is rotatably connected with the length-adjusting arm with the locking function of the other set of clamp holding assembly in the Z-axis direction, and the other end of the second holding portion is detachably connected with the first clamping member and the second clamping member in a locking manner.
5. The device for dismounting and mounting insulators and fittings in a substation with auxiliary power of claim 2, wherein the fixing module is an annular hoop.
6. The device for electrified auxiliary dismounting and mounting of insulators and fittings in a substation according to claim 1 or 2, wherein the length-adjustable pull arm with the locking function is at least one of a screw rod sleeve and a telescopic rod with a positioning pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010114991.1A CN111216068A (en) | 2020-02-25 | 2020-02-25 | Device for assisting in dismounting insulator and hardware fitting in transformer substation in electrified mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010114991.1A CN111216068A (en) | 2020-02-25 | 2020-02-25 | Device for assisting in dismounting insulator and hardware fitting in transformer substation in electrified mode |
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| Publication Number | Publication Date |
|---|---|
| CN111216068A true CN111216068A (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010114991.1A Pending CN111216068A (en) | 2020-02-25 | 2020-02-25 | Device for assisting in dismounting insulator and hardware fitting in transformer substation in electrified mode |
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| Country | Link |
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| CN (1) | CN111216068A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4760640A (en) * | 1986-10-02 | 1988-08-02 | Lawrence William G | Insulator-jack for replacing insulator disks |
| CN202550392U (en) * | 2012-02-28 | 2012-11-21 | 云南电网公司带电作业分公司 | Wire connecting plate clamp for replacing V-type insulator of compact 500kV line |
| CN203553753U (en) * | 2013-11-06 | 2014-04-16 | 国家电网公司 | Compact type tension-resistant pole tower horizontal-string insulator replacing tool |
| CN104064997A (en) * | 2014-07-16 | 2014-09-24 | 国家电网公司 | Tension-resistance double-string-insulator cross arm side connection hardware fitting electrified replacement clamp and use method |
| JP2014183688A (en) * | 2013-03-21 | 2014-09-29 | Chugoku Electric Power Co Inc:The | Load cancellation device for insulator |
| CN206099164U (en) * | 2016-10-28 | 2017-04-12 | 国网浙江省电力公司金华供电公司 | Change combination tool of extra -high voltage with two dead end insulator of returning of tower with electricity |
| CN207926066U (en) * | 2018-01-10 | 2018-09-28 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of simple replacement gold utensil string devices |
-
2020
- 2020-02-25 CN CN202010114991.1A patent/CN111216068A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4760640A (en) * | 1986-10-02 | 1988-08-02 | Lawrence William G | Insulator-jack for replacing insulator disks |
| CN202550392U (en) * | 2012-02-28 | 2012-11-21 | 云南电网公司带电作业分公司 | Wire connecting plate clamp for replacing V-type insulator of compact 500kV line |
| JP2014183688A (en) * | 2013-03-21 | 2014-09-29 | Chugoku Electric Power Co Inc:The | Load cancellation device for insulator |
| CN203553753U (en) * | 2013-11-06 | 2014-04-16 | 国家电网公司 | Compact type tension-resistant pole tower horizontal-string insulator replacing tool |
| CN104064997A (en) * | 2014-07-16 | 2014-09-24 | 国家电网公司 | Tension-resistance double-string-insulator cross arm side connection hardware fitting electrified replacement clamp and use method |
| CN206099164U (en) * | 2016-10-28 | 2017-04-12 | 国网浙江省电力公司金华供电公司 | Change combination tool of extra -high voltage with two dead end insulator of returning of tower with electricity |
| CN207926066U (en) * | 2018-01-10 | 2018-09-28 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of simple replacement gold utensil string devices |
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Application publication date: 20200602 |
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