CN110108944A - A kind of line insulation test grounding wire device and its line insulation test method - Google Patents
A kind of line insulation test grounding wire device and its line insulation test method Download PDFInfo
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- CN110108944A CN110108944A CN201910482667.2A CN201910482667A CN110108944A CN 110108944 A CN110108944 A CN 110108944A CN 201910482667 A CN201910482667 A CN 201910482667A CN 110108944 A CN110108944 A CN 110108944A
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 238000009413 insulation Methods 0.000 title claims abstract description 55
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 16
- 239000004020 conductor Substances 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 11
- 238000012795 verification Methods 0.000 claims description 5
- 239000012211 strain insulator Substances 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 description 10
- 230000033228 biological regulation Effects 0.000 description 8
- 230000005611 electricity Effects 0.000 description 7
- 238000007689 inspection Methods 0.000 description 4
- 230000008450 motivation Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 206010052804 Drug tolerance Diseases 0.000 description 3
- 230000006399 behavior Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000026781 habituation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002650 habitual effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/12—End pieces terminating in an eye, hook, or fork
- H01R11/14—End pieces terminating in an eye, hook, or fork the hook being adapted for hanging on overhead or other suspended lines, e.g. hot line clamp
- H01R11/15—Hook in the form of a screw clamp
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/36—Conductive members located under tip of screw
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of line insulation test grounding wire device and its line insulation test methods, it is desirable to provide a kind of line insulation test grounding wire device that operating efficiency can be improved and its line insulation test method.For clamping the conducting wire end terminal of conducting wire when grounding wire device therein includes operation, the ground operation bar being connect with conducting wire end terminal, the short-circuit line for being separately connected conducting wire end terminal and ground connection end terminal for clamping grounding body, the ground connection end terminal for being provided with operation bolt and both ends when operation；It further include being screwed in the wing bolt of the p-wire on ground connection end terminal, for connecting insulating megger, the operating head with the operation bolt clamping on ground connection end terminal, and the operating stick being connected with operating head；Pin rod is provided on the operation bolt, at one end for connecting with operating head, pin rod and operation bolt constitute cross；Operating head and operation tether the one end connect and the blind hole protruded into for shank end are arranged, and one group of limiting slot is arranged on blind hole outer wall.
Description
Technical field
The present invention relates to electric power maintenance equipment technical fields, more particularly, to a kind of line insulation test grounding wire device
And its line insulation test method.
Background technique
Line insulation resistance test is the work that route is routinely carried out, especially carry out on 10kV to 110kV route compared with
It is more.Before new route puts into operation, after complicated maintenance, when doing before and after pressure test or being difficult to find that fault point after failure etc.,
Need to carry out the work of line insulation resistance test.Due to relatively easy, specification of the people to the work of line insulation test work
The attention degree of property is often covered by its test result, is not easy to cause attention.Activity duration is long, and Partial Jobs process is lack of standardization, shape
Violating the regulations at habituation, Yi Yinqi induced electricity hurts sb.'s feelings, the even danger such as electric shock.Conventional line insulation method for testing resistance is divided
It analyses as follows:
(1) before new route puts into operation, line insulation resistance test after complicated maintenance
New route put into operation before, after complicated maintenance when line insulation resistance test, route turns inspecting state.When testing the first phase,
Installing p-wire can be completed under route inspecting state, and route switchs to cold standby state when test.Removing the phase p-wire, dress
When setting a phase p-wire, tester needs to carry out route 5 times and turns to overhaul the cold standby process that turns again, consumes about 3 hour time,
In order to shorten the activity duration, there are the violation situations that direct-on-line road cold standby state completes the dismounting of 5 p-wires.This is in violation of rules and regulations
Operating personnel is exposed under the risk that tested line influence electricity and sending a telegram here suddenly is hurted sb.'s feelings by behavior, Yi Yinqi induced electricity hurts sb.'s feelings,
The even danger such as electric shock.It according to said method to reduce electricity to hurt sb.'s feelings risk, three-phase p-wire can be assembled and disassembled simultaneously, but need to carry three times
Material includes insulating megger, this is also to be difficult to, while cannot carry out phase insulation test job.Which forms habits
Property violating the regulations motivation and behavior.
(2) megger test after line fault
After line fault tripping, reclosing is unsuccessful or non-reclosing, all will lead to route and is unable to normal operation, interrupts
Power supply, most of route operation maintenance personnel all by rule of thumb with route operation conditions or Given information, arrive suspect compared with can at the first time
Point spy's inspection of energy failure is looked into.If not finding fault point, general route is longer, when being difficult to clear failure point range, often Shen
Please route turn cold standby, take megger test method judgement search fault point, when route permanent fault, it is also necessary to by line
It unlocks point multistage and carries out line insulation resistance test in road.Due to coming the pressure of self-powered, customer service and route availability coefficient etc., operation
Spy patrols personnel outside, and some of the staff do not handle work ticket and turn maintenance when megger test, in route cold standby state
It begins to overlap p-wire with operating stick after electrical verification, if tested route is extremely connected with electromagnetic potential transformer or route and needs
When wanting sectionalization test insulation resistance, electromagnetic potential transformer and strain insulator drainage thread are released, or even removes the inspection of the elements such as insulator
It looks into, these operation process have that operating personnel is tested line influence electricity, suddenly incoming call injury；With permanent fault route
Conducting wire is hung on next voltage class route after breaking or falling string, and measurement circuit does not turn to overhaul, so that on tested route band
Under the risk hurted sb.'s feelings by hanging wire road working voltage, the danger such as Yi Yinqi induced electricity hurts sb.'s feelings, even gets an electric shock.And easily forming the habit property is disobeyed
The behavior and motivation of chapter.
Summary of the invention
The purpose of the present invention is intended to overcome the shortcomings of the prior art, and operation safety can be effectively improved by providing one kind
Line insulation test grounding wire device and its line insulation test method.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions:
A kind of line insulation test grounding wire device, for clamping the conducting wire end terminal of conducting wire when including operation, with conductor wire end
The ground operation bar of wire clamp connection, the ground connection end terminal and two when operation for clamping grounding body, being provided with operation bolt
End is separately connected conducting wire end terminal and is grounded the short-circuit line of end terminal；Its further include be screwed in ground connection end terminal on, be used for
Connect insulating megger p-wire wing bolt, with ground connection end terminal on operation bolt clamping operating head, and with operation
The connected operating stick of head；Pin rod is provided on the operation bolt, at one end for connecting with operating head, pin rod and operation bolt constitute ten
Font；The operating head and operation tether the one end connect and the blind hole protruded into for shank end are arranged, and are arranged one on blind hole outer wall
Group is in J-shaped, the limiting slot for being caught in for pin rod.
Preferably, the operating head is tethered with ground connection end terminal operation by J-shaped blind hole structure and is connect.
Preferably, the operating head is connect by helicitic texture with operating stick.
Preferably, the short-circuit line is used with the short-circuit line for thickening transparent insulating layer.
A kind of line insulation test method, uses grounding wire device as described above, which includes in following
Hold:
Route is switched to cold standby state by step (1), and pulling open can be by the electromagnetic potential transformer and mutual induction of voltage of operation isolation
Device secondary side air switch；
The strain insulator drainage thread and electromagnetic potential transformer drainage thread that step (2) investigation megger test needs to release；
Step (3) is if woth no need to release drainage thread situation test insulation resistance process:
1. installing battery of tests grounding wire device in A phase conductor after route megger test point electrical verification；
2. connecting test line: p-wire test connecting pin being connected on ground connection end terminal butterfly bolt, ground short circuit line is used
It is connected to the p-wire of line conductor, connects other p-wires；
Grounding body and hanging is detached from 3. end terminal will be grounded with operating stick and dismantled；
4. measurement circuit insulation resistance；
5. restoring the ground connection end terminal of tape test line with operating stick, p-wire is removed；
6. repeating 2. -5. test b, C phase conductor；
7. removing grounding wire device, site clearing.
Step (4) needs to unlock in route the process of sectionalization test line insulation resistance:
1. installing battery of tests grounding wire device respectively at drainage thread waypoint drainage thread both ends to be unlocked；
2. unlocking drainage thread；
3. repeat step (3) in 2. -6., respectively test segmentation after each section of line insulation resistance；
4. restoring the drainage thread unlocked；
5. removing grounding wire device, site clearing.
Preferably, the process for unlocking route electromagnetic potential transformer drainage thread measurement circuit insulation resistance is as follows:
1. needing to unlock installing battery of tests grounding wire device, electromagnetism on the line conductor of electromagnetic potential transformer position
One group of grounding wire device is installed on formula voltage transformer；
2. releasing electromagnetic potential transformer drainage thread；
3. in repeating said steps (3) 2. -6., measurement circuit insulation resistance；
4. restoring the voltage transformer drainage thread unlocked；
5. removing grounding wire device, site clearing.
Compared with prior art, the present invention has the advantage that
The present invention can reduce the risk of line insulation resistance test operation, effectively improve line insulation resistance test operation safety
Property, normalization and operating efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram when present invention uses.
Fig. 2 is the structural schematic diagram of operating head in Fig. 1.
Fig. 3 is the structural schematic diagram that end terminal is grounded in Fig. 1.
In figure: conducting wire 1, conducting wire end terminal 2, pin rod 3, blind hole 4, ground operation bar 5, short-circuit line 6, grounding body 7, ground terminal
Wire clamp 8, wing bolt 9 operate bolt 10, operating head 11, limiting slot 12, p-wire 13, insulating megger 14, operating stick 15.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under that premise of not paying creative labor
Embodiment shall fall within the protection scope of the present invention.In the following description, structure and work side of the invention in order to clearly demonstrate
Formula will be described on the basis of attached drawing by many Directional words, but should by "front", "rear", "left", "right",
The Word Understandings such as "upper", "lower" are not construed as word of limitation for convenience of term.
Line insulation test grounding wire device shown in Fig. 1-3, for clamping the conducting wire end terminal of conducting wire when including operation,
The ground operation bar being connect with conducting wire end terminal, ground connection end line when operation for clamping grounding body, being provided with operation bolt
Folder and both ends are separately connected conducting wire end terminal and are grounded the short-circuit line of end terminal；It further includes being screwed in ground connection end line
The operating head of operation bolt clamping on the wing bolt of p-wire on folder, for connecting insulating megger, with ground connection end terminal, with
And the operating stick being connected with operating head；Pin rod, pin rod and operation are provided on the operation bolt, at one end for connecting with operating head
Bolt constitutes cross；The operating head and operation tether the one end connect and the blind hole protruded into for shank end, and blind hole outer wall are arranged
One group of upper setting is in J-shaped, the limiting slot for being caught in for pin rod.
For easy to disassemble and maintenance, operating stick is saved, the operating head is connect by helicitic texture with operating stick, it is clear that
The modes such as clamping can be used to be attached.The operating head is tethered with ground connection end terminal operation by J-shaped blind hole structure and is connect.
For the ease of carrying, the operating stick is connected and composed by two sections of bodies of rod, and the modes such as threaded connection or clamping can be used
It is attached.The number of segment of obvious operating stick can be increased according to its actual needs, and such as three sections.
The handling of operating stick, operating head and ground connection end terminal are very convenient quick, and when assembling only needs operating head and pin rod
Back spin turns certain angle in place for docking, and dismounting, which then rotates backward operating head by operating stick, to be separated with pin rod, meet
It is flexibly detached from and connection is grounded end terminal, meet the requirement of test ground terminal.Dish-shaped bolt model M8, for effectively fixed exhausted
Edge megger p-wire avoids the insulating megger p-wire when assembly and disassembly are grounded end terminal from falling off." portable is short for short-circuit line satisfaction
Road is grounded technical standard " on the basis of, reinforce transparent insulating layer, thickness adds to 1.2mm, and insulation resistance is greater than 100M Ω.
The present invention ought can routinely be grounded normal use completely, while not increase input substantially, configure the grounding wire mounting
It postpones woth no need to repeat to configure conventional ground line.
A kind of line insulation test method, uses grounding wire device as described above, which includes in following
Hold:
Route is switched to cold standby state by step (1), and pulling open can be by the electromagnetic potential transformer and mutual induction of voltage of operation isolation
Device secondary side air switch；
The strain insulator drainage thread and electromagnetic potential transformer drainage thread that step (2) investigation megger test needs to release；
Step (3) is if woth no need to release drainage thread situation test insulation resistance process:
1. installing battery of tests grounding wire device in A phase conductor after route megger test point electrical verification；
2. connecting test line: p-wire test connecting pin being connected on ground connection end terminal butterfly bolt, ground short circuit line is used
It is connected to the p-wire of line conductor, connects other p-wires；
Grounding body and hanging is detached from 3. end terminal will be grounded with operating stick and dismantled；
4. measurement circuit insulation resistance；
5. restoring the ground connection end terminal of tape test line with operating stick, p-wire is removed；
6. repeating 2. -5. test b, C phase conductor；
7. removing grounding wire device, site clearing.
Step (4) needs to unlock in route the process of sectionalization test line insulation resistance:
1. installing battery of tests grounding wire device respectively at drainage thread waypoint drainage thread both ends to be unlocked；
2. unlocking drainage thread；
3. repeat step (3) in 2. -6., respectively test segmentation after each section of line insulation resistance；
4. restoring the drainage thread unlocked；
5. removing grounding wire device, site clearing.
The process for unlocking route electromagnetic potential transformer drainage thread measurement circuit insulation resistance is as follows:
1. needing to unlock installing battery of tests grounding wire device, electromagnetism on the line conductor of electromagnetic potential transformer position
One group of grounding wire device is installed on formula voltage transformer；
2. releasing electromagnetic potential transformer drainage thread；
3. in repeating said steps (3) 2. -6., measurement circuit insulation resistance；
4. restoring the voltage transformer drainage thread unlocked；
5. removing grounding wire device, site clearing.
Before line test insulation resistance, apply stopping all work on route to licensor, route goes to cold standby.Connect,
It tears p-wire open and position electrical verification is independently selected simultaneously by operating personnel to dismantling, restore the line-to-ground required when related drainage thread operation
Grounding wire device is installed to realize.Meeting " China Nanfang Grid Co., Ltd's electric power safety working regulation ", " operating personnel answers
The operation in the protection scope of ground line.Forbid carrying out interruption maintenance in the case where no ground line or ground line installing are uneven complete
Operation." require.Permanent fault circuit breaking or fall string after conducting wire hang on next voltage class route, measurement circuit does not turn
Maintenance, so that hurting sb.'s feelings risk by hanging wire road working voltage on tested route band and motivation violating the regulations is controlled.
Line maintenance state is managed by work responsible person, is grounded the test for being connected to p-wire using test operating stick
Line ground connection end terminal dismantles disengaging ground connection and test ground connection end terminal that is hanging, restoring tape test line, split-phase type connect
Ground wire is dismantled ground connection end terminal and be detached from ground connection and mention body by inspection earthing line is changed into p-wire, restores ground connection end line clamping connection
Ground is changed into inspection earthing line process by p-wire, avoids the operating process that route is repeated 6 times state transformation.Route repeats 6
The operation of next state transformation at least needs 3 hours per time, as long as testing then less than 10 minutes, by the entire test process of new technological process
Less than 30 minutes.Route insulation resistance of every test, effective time can shorten working time contracting by least 3.5 hours
It is as short as 0.5 hour.Reduce the operating quantity of 6 secondary line states transformation and wait the line status transformation waiting time, effectively avoids
Habitual motivation and action violating the regulations, the habituation for having prevented route cold standby state operation are violating the regulations.
Present invention grounding wire device installs grounding wire device also just instead of connection one instead of a part of p-wire
Divide p-wire, operating personnel would not lazy not attaching ground wire device.Prevent to connect not attaching ground wire device, remove p-wire
It is violating the regulations with the habituation of removing, restore drainage thread, while controlling the main electricity of line insulation test and hurting sb.'s feelings risk.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of line insulation test grounding wire device, for clamping the conducting wire end terminal of conducting wire when including operation, with conducting wire
The ground operation bar of end terminal connection, ground connection end terminal when operation for clamping grounding body, being provided with operation bolt, and
Both ends are separately connected conducting wire end terminal and are grounded the short-circuit line of end terminal；It is characterized by also including be screwed in ground terminal
The operating head of operation bolt clamping on the wing bolt of p-wire on wire clamp, for connecting insulating megger, with ground connection end terminal,
And the operating stick being connected with operating head；Pin rod, pin rod and behaviour are provided on the operation bolt, at one end for connecting with operating head
Make bolt and constitutes cross；The operating head and operation tether the one end connect and the blind hole protruded into for shank end are arranged, and outside blind hole
One group is arranged on wall in J-shaped, the limiting slot for being caught in for pin rod.
2. line insulation test test grounding wire device according to claim 1, it is characterised in that: the operating head passes through
J-shaped blind hole structure is tethered with ground connection end terminal operation and is connect.
3. line insulation test grounding wire device according to claim 1, it is characterised in that: the operating head passes through screw thread
Structure is connect with operating stick.
4. line insulation test grounding wire device according to claim 1, it is characterised in that: the short-circuit line, which uses, to be had
Thicken the short-circuit line of transparent insulating layer.
5. a kind of line insulation test method, it is characterised in that grounding wire device a method according to any one of claims 1-3 is used, it should
Test method includes following content:
Route is switched to cold standby state by step (1), and pulling open can be by the electromagnetic potential transformer and mutual induction of voltage of operation isolation
Device secondary side air switch；
The strain insulator drainage thread and electromagnetic potential transformer drainage thread that step (2) investigation megger test needs to release；
Step (3) is if woth no need to release drainage thread situation test insulation resistance process:
1. installing battery of tests grounding wire device in A phase conductor after route megger test point electrical verification；
2. connecting test line: p-wire test connecting pin being connected on ground connection end terminal butterfly bolt, ground short circuit line is used
It is connected to the p-wire of line conductor, connects other p-wires；
Grounding body and hanging is detached from 3. end terminal will be grounded with operating stick and dismantled；
4. measurement circuit insulation resistance；
5. restoring the ground connection end terminal of tape test line with operating stick, p-wire is removed；
6. repeating 2. -5. test b, C phase conductor；
7. removing grounding wire device, site clearing.
Step (4) needs to unlock in route the process of sectionalization test line insulation resistance:
1. installing battery of tests grounding wire device respectively at drainage thread waypoint drainage thread both ends to be unlocked；
2. unlocking drainage thread；
3. repeat step (3) in 2. -6., respectively test segmentation after each section of line insulation resistance；
4. restoring the drainage thread unlocked；
5. removing grounding wire device, site clearing.
6. line insulation test method according to claim 5, it is characterised in that:
The process for unlocking route electromagnetic potential transformer drainage thread measurement circuit insulation resistance is as follows:
1. needing to unlock installing battery of tests grounding wire device, electromagnetism on the line conductor of electromagnetic potential transformer position
One group of grounding wire device is installed on formula voltage transformer；
2. releasing electromagnetic potential transformer drainage thread；
3. in repeating said steps (3) 2. -6., measurement circuit insulation resistance；
4. restoring the voltage transformer drainage thread unlocked；
5. removing grounding wire device, site clearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910482667.2A CN110108944A (en) | 2019-06-04 | 2019-06-04 | A kind of line insulation test grounding wire device and its line insulation test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910482667.2A CN110108944A (en) | 2019-06-04 | 2019-06-04 | A kind of line insulation test grounding wire device and its line insulation test method |
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| CN110108944A true CN110108944A (en) | 2019-08-09 |
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| CN201910482667.2A Pending CN110108944A (en) | 2019-06-04 | 2019-06-04 | A kind of line insulation test grounding wire device and its line insulation test method |
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| CN111130008A (en) * | 2019-12-19 | 2020-05-08 | 国网浙江龙游县供电有限公司 | Adjustable drainage spreader |
| WO2021183065A1 (en) * | 2020-03-11 | 2021-09-16 | Esa Kompozit Ve Teknolojik Cozumler Muhendislik Sanayi Ticaret As | A vice coupled with a clamp for earthing |
| CN114122760A (en) * | 2021-11-12 | 2022-03-01 | 国家电网有限公司 | Temporary grounding wire power connection clamp device and use method |
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