CN107677916A - End shield of high-voltage bushing ground shield and end shield of high-voltage bushing - Google Patents
End shield of high-voltage bushing ground shield and end shield of high-voltage bushing Download PDFInfo
- Publication number
- CN107677916A CN107677916A CN201710787161.3A CN201710787161A CN107677916A CN 107677916 A CN107677916 A CN 107677916A CN 201710787161 A CN201710787161 A CN 201710787161A CN 107677916 A CN107677916 A CN 107677916A
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- shield
- end shield
- ground
- ground shield
- voltage bushing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The present invention relates to a kind of end shield of high-voltage bushing ground shield and end shield of high-voltage bushing, including the ground shield inner cover being connected with bottom shielding of bushing seat, the ground shield outer cover being connected with the ground shield inner cover and the end shield lead extension rod being connected with end shield lead, wherein described end shield lead extension rod is connected through the ground shield inner cover with the ground shield outer cover, measuring coil is installed between the inwall of the ground shield inner cover and the end shield lead extension rod, measurement line connection-peg is installed along the outer wall of the ground shield inner cover, the lead-out terminal of the measuring coil is connected with one end of signal extraction line, the other end of the signal extraction line is connected with the measurement line connection-peg.The present invention not only realizes the measurement of leakage current, and avoids the end shield of high-voltage bushing exposed to outer in customary State Overhaul Test.
Description
Technical field
The present invention relates to the technical field of high voltage equipment insulation, refer in particular to a kind of end shield of high-voltage bushing ground shield and
End shield of high-voltage bushing.
Background technology
The major insulation of bushing is mainly capacitor core, its by multi-layer capacity pole plate by certain design parameter wind and
Into end shield is the layer capacitance pole plate of outermost one, is also referred to as grounded pole plate.In actual sleeve pipe charging operation, in order to realize in sleeve pipe
Portion's electric field homogenizing distribution, end shield must carry out equipotential link with the earth, that is, need reliable ground；And carried out in sleeve pipe customary
When State Overhaul Test or preventive trial, bottom shielding of bushing then uniquely measures tap for sleeve pipe, need to untie end shield ground connection, so as to
Carry out all kinds of testing experiments.
In recent years, about sleeve pipe Frequent Accidents caused by process for producing casing quality and operation installation etc., according to incomplete system
Meter, accident more than 50% are caused by end shield imperfect earth, have had a strong impact on the safety and stability and power supply reliability of power network, caused
Huge economic loss and harmful effect.Therefore, on the one hand it is badly in need of realizing to the status monitoring of sleeve pipe, assessment and insulation diagnosis；
On the other hand bottom shielding of bushing Earthing Reliability need to be improved, is finally reached the operational reliability for improving in-service sleeve pipe, ensures power network
The purpose of safe and stable operation.
Bottom shielding of bushing ground connection is mainly realized by end shield ground insulation cover at present, such as Chinese utility model patent
(204925178U) discloses a kind of bushing time end shield ejector, as shown in figure 1, the ejector includes：Insulating boot
1st, O shapes sealing gasket 2, leading-out terminal 3, T-shaped sealing gasket 4；Wherein, insulating boot 1 includes button capacitor, metal cap；Micro capacitance
The top connection metal cap of device, the bottom of button capacitor is connected with copper conducting rod；Leading-out terminal 3 include copper conducting rod,
Tubular porcelain insulating medium, metal reinforcement member；Copper conducting rod passes through from tubular porcelain insulating media center, its both ends difference
Connection time end shield lead and button capacitor；Metal reinforcement member is enclosed on outside tubular porcelain insulating medium；T-shaped sealing gasket 4 is close
Big envelope is on leading-out terminal 3, the lower edge of metal reinforcement member；The sealing shroud of O shapes sealing gasket 2 is on leading-out terminal 3, metal fixed part
The upper limb of part.Although above-mentioned can draw sleeve pipe time end shield current potential, and can ensures that time end shield exit insulation is good, still
Problems be present：The leakage current that end shield lead flows out is directly grounded by existing end shield ground insulation cover, can not realize leakage
The measurement of electric current；Furthermore after existing end shield ground insulation cover is installed, in the powered running of sleeve pipe, can not intuitively it see
Examine or judge whether its ground connection is good；In addition, (the offline examination of customary State Overhaul Test or preventive trial is carried out to bushing
Test) when, existing end shield ground insulation cover need to be disassembled completely, so as to cause whole end shield to be fully exposed among air,
Not only end shield is made moist but also have impact on the validity of test data.Meanwhile repeated disassembled and assembled end shield ground insulation cover, can be because
The problems such as factor such as human operational error or the abrasion of device itself silk mouth causes end shield protective cover to crimp not tight or virtual connection, so as to go out
Existing end shield is grounded insecure problem.
The content of the invention
Therefore, the technical problems to be solved by the invention be to overcome the problem of product existing defects in the prior art so as to
A kind of end shield of high-voltage bushing ground shield that product appearance is also can guarantee that even if for tough plastics and high gland are provided
Pipe end shield.
In order to solve the above technical problems, a kind of end shield of high-voltage bushing ground shield of the present invention, is installed on bushing
In end shield, the end shield of high-voltage bushing includes bottom shielding of bushing seat and the end shield lead on described sleeve pipe end shield seat, described
Ground shield inner cover that ground shield includes being connected with described sleeve pipe end shield seat, it is connected with the ground shield inner cover
Ground shield outer cover and the end shield lead extension rod being connected with the end shield lead, wherein the end shield lead extension rod is worn
Cross the ground shield inner cover with the ground shield outer cover to be connected, inwall and the end of the ground shield inner cover
Measuring coil is installed between screen lead extension rod, measurement line connection-peg is installed along the outer wall of the ground shield inner cover,
The lead-out terminal of the measuring coil is connected with one end of signal extraction line, the other end and the measurement of the signal extraction line
Line connection-peg is connected.
In one embodiment of the invention, light-emitting device is also equipped with along the outer wall of the ground shield inner cover, and
The light-emitting device is connected with the signal extraction line.
In one embodiment of the invention, the middle part of the end shield lead extension rod is provided with spring members.
In one embodiment of the invention, the outer cover of the end shield lead extension rod is provided with insulation sleeve, and described exhausted
Edge set be arranged on on contact jaw to the end shield lead extension rod between the spring members of the end shield lead.
In one embodiment of the invention, the inwall of the ground shield inner cover is provided with shielding liner.
In one embodiment of the invention, insulation sleeve, institute are provided between the measuring coil and the shielding liner
Measuring coil is stated between the insulation sleeve and the end shield lead extension rod.
In one embodiment of the invention, the joint of the ground shield outer cover and the ground shield inner cover
Provided with the first Butt sealing groove and docking silk mouth.
In one embodiment of the invention, the joint of the ground shield inner cover and described sleeve pipe end shield seat is provided with
Second Butt sealing groove and connecting filament mouth.
The invention also discloses a kind of end shield of high-voltage bushing, including bottom shielding of bushing seat and on described sleeve pipe end shield seat
End shield lead, in addition to above-mentioned end shield of high-voltage bushing ground shield.
In one embodiment of the invention, the outer wall of the end shield lead is arranged with end shield lead wire insulation set.
The above-mentioned technical proposal of the present invention has advantages below compared with prior art：
End shield of high-voltage bushing ground shield of the present invention and end shield of high-voltage bushing, it is possible to achieve do not changing sleeve pipe
On the premise of the original reliable ground structure of end shield, safe and reliable leakage current measurement is provided for bushing state on_line monitoring
Data, the present invention both ensure that the safe and reliable ground connection of end shield of high-voltage bushing, while also be the on-line monitoring of sleeve pipe state of insulation
Provide effective means.
Brief description of the drawings
In order that present disclosure is more likely to be clearly understood, specific embodiment and combination below according to the present invention
Accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is the schematic diagram of existing end shield ground insulation cover；
Fig. 2 is the schematic diagram of end shield of high-voltage bushing ground shield of the present invention；
Fig. 3 is the schematic diagram of end shield of high-voltage bushing of the present invention；
Fig. 4 is the connection diagram of end shield of high-voltage bushing of the present invention and the ground shield.
Reference in figure：1- insulating boots, 2-O shape sealing gaskets, 3- leading-out terminals, 4-T shape sealing gaskets, 10- ground protections
Cover inner cover, 11- measuring coils, 12- measurement line connection-pegs, 13- signal extraction lines, 14- light-emitting devices, 15- shielding liners, 16-
Insulation sleeve, 17- the first Butt sealing grooves, 20- ground shield outer covers, 21- the second Butt sealing grooves, 30- end shield leads prolong
Stock, 31- spring members, 32- insulation sleeves, 40- end shield of high-voltage bushing, 41- bottom shielding of bushing seats, 42- end shield leads, 43- end shields
Lead wire insulation set.
Embodiment
Embodiment one：
As shown in Fig. 2 and Fig. 3 and Fig. 4, the present embodiment provides a kind of end shield of high-voltage bushing ground shield, is installed on height
Press on bottom shielding of bushing 40, the end shield of high-voltage bushing 40 includes bottom shielding of bushing seat 41 and on described sleeve pipe end shield seat 41
End shield lead 42, the ground shield include be connected with described sleeve pipe end shield seat 41 ground shield inner cover 10, with it is described
The connected ground shield outer cover 20 of ground shield inner cover 10 and the end shield lead being connected with the end shield lead 42 extend
Bar 30, wherein the end shield lead extension rod 30 passes through the ground shield inner cover 10 and the phase of ground shield outer cover 20
Even, measuring coil 11 is installed between the inwall of the ground shield inner cover 10 and the end shield lead extension rod 30, along institute
The outer wall for stating ground shield inner cover 10 is provided with measurement line connection-peg 12, and the lead-out terminal of the measuring coil 11 carries with signal
One end of line taking 13 is connected, and the other end of the signal extraction line 13 is connected with the measurement line connection-peg 12.
End shield of high-voltage bushing ground shield described in the present embodiment, it is installed on end shield of high-voltage bushing 40, the high gland
Pipe end shield 40 includes bottom shielding of bushing seat 41 and the end shield lead 42 on described sleeve pipe end shield seat 41, the ground shield
Including ground shield inner cover 10, ground shield outer cover 20 and end shield lead extension rod 30, wherein described sleeve pipe end shield seat
41 are connected with the ground shield inner cover 10, the ground shield inner cover 10 is connected with the ground shield outer cover 20,
The ground shield outer cover 20 is reliable ground body, so as to ensure that the safe and reliable ground connection of the end shield of high-voltage bushing 40,
The end shield lead 42 is connected with the end shield lead extension rod 30, extends described sleeve pipe end shield lead-out wire, and bushing is real
During the charging operation of border, the leakage current of the bushing major insulation is transmitted to the end shield lead by the end shield lead 42
On extension rod 30, the end shield lead extension rod 30 passes through the ground shield inner cover 10 and the ground shield outer cover 20
It is connected, specifically, the ground shield outer cover 20 is installed on the ground shield inner cover 10 and the end shield lead extends
On bar 30, because described sleeve pipe end shield seat 41 is grounding body, and described sleeve pipe end shield seat 41 and the ground shield inner cover 10
It is connected, the ground shield inner cover 10 is connected with the ground shield outer cover 20, the ground shield outer cover 20 and institute
State end shield lead extension rod 30 to be connected, therefore the reliable ground of end shield lead extension rod 30 can be ensured, opened in bushing
When opening up customary State Overhaul Test or preventive trial (off-line testing), end shield of high-voltage bushing will not be completely exposed in air,
And then ensure that above-mentioned experiment can also be carried out under overcast and rainy or larger moisture weather, improve the time during the power failure of scene
Utilization rate；And at the trial, it is not necessary to which integral demounting, the ground shield inner cover 10 is without dismounting, the ground shield
Inner cover 10 still protects the end shield lead 42 and exempts to be affected by, and only need to open the ground shield outer cover
20, correlation test can be carried out, therefore protective action can be played to the end shield of high-voltage bushing 40, effectively reduce high gland
The dismounting number of pipe end shield ground shield；The inwall of the ground shield inner cover 10 and the end shield lead extension rod 30 it
Between measuring coil 11 is installed, measurement line connection-peg 12, the measurement are installed along the outer wall of the ground shield inner cover 10
The lead-out terminal of coil 11 is connected with one end of signal extraction line 13, the other end of the signal extraction line 13 and the measurement line
Connection-peg 12 is connected, and the measuring coil 11 obtains flowing through the end shield lead extension rod 30 by electromagnetic induction principle, measurement
Leakage current, and corresponding output signal is transmitted to the measurement line connection-peg 12 by the signal extraction line 13, led to
Cross the measurement line connection-peg 12 to use for bushing state on_line monitoring, safety is provided for bushing state on_line monitoring
Reliable leakage current measurement data, reach the powered effect monitored in real time of bushing state.
Observe by the naked eye intuitive judgment end shield Grounding in order to realize, along the ground shield inner cover 10
Outer wall be also equipped with light-emitting device 14, and the light-emitting device 14 is connected with the signal extraction line 13, it is described flow through it is described
The leakage current of end shield lead extension rod 30, transmitted to the light-emitting device 14, exported to institute by the signal extraction line 13
The signal for stating light-emitting device 14 provides DC input voitage by rectification module for the light-emitting device 14, makes the light-emitting device
14 is luminous, only when above-mentioned end shield ground connection is reliable, input voltage that the light-emitting device 14 can just be stablized, therefore can lead to
Cross and visually observe the luminous situation of the light-emitting device 14 and carry out intuitive judgment end shield Grounding, if the light-emitting device 14 occurs
The situation for flashing or not working, so that it may judge that imperfect earth or unearthed situation occurs in end shield of high-voltage bushing, play as scene
Patrol officer provides the effect of warning.
The middle part of the end shield lead extension rod 30 is provided with spring members 31, when the ground shield outer cover 20 compresses institute
When stating end shield lead extension rod 30, the spring members 31 can apply an opposite thrust, and then ensure the ground protection
The close connection of cover outer cover 20 and the end shield lead extension rod 31.To avoid the leakage current of the end shield lead extension rod 30
Signal is directly grounded by the ground shield inner cover 10, and the outer cover of the end shield lead extension rod 30 is provided with insulation sleeve
32, because the contact surface of the end shield lead extension rod 30 and the ground shield inner cover 10 is smaller, easily occur contacting not
Good phenomenon, therefore the insulation sleeve 32 is arranged on the contact jaw with the end shield lead 42 between the spring members 31
On end shield lead extension rod 30, so as to reach the effect with the outer wall of ground shield inner cover 10 insulation.
The inwall of the ground shield inner cover 10 is provided with shielding liner 15, and the shielding liner 15 is high magnetic permeability
Magnetic screen liner, advantageously ensure that interference of the measurement data from strong external magnetic field.In the measuring coil 11 and the shielding
Insulation sleeve 16 is provided between lining 15, the measuring coil 11 is located at the insulation sleeve 16 and the end shield lead extension rod 30
Between, so as to play a part of the fixed measuring coil 11 and insulation.
The joint of the ground shield inner cover 10 and described sleeve pipe end shield seat 41 be provided with the first Butt sealing groove 17 and
Connecting filament mouth, for the good connection for realizing the ground shield inner cover 10 and described sleeve pipe end shield seat 41 and reliable sealing.
The ground shield outer cover 20 is provided with the second Butt sealing groove 21 with the joint of the ground shield inner cover 10 and docked
Silk mouth, for the good connection for being grounded protective cover inner cover 10 and the ground shield outer cover 20 and reliable sealing.
Embodiment two：
The present embodiment provides a kind of end shield of high-voltage bushing, including bottom shielding of bushing seat 41, on described sleeve pipe end shield seat 41
End shield lead 42 and embodiment one described in end shield of high-voltage bushing ground shield.Due to the end shield of high-voltage bushing bag
The ground shield described in embodiment one, therefore all advantages possessed by embodiment one are included, embodiment two also all has.
In addition, the outer wall of the end shield lead 42 is arranged with end shield lead wire insulation set 43, by the effect of insulation, so as to realize the set
Pipe end shield seat 41 is grounding body, is advantageous to the reliable ground of the end shield of high-voltage bushing 40.
To sum up, technical scheme of the present invention has advantages below：
1. end shield of high-voltage bushing ground shield of the present invention, is installed on end shield of high-voltage bushing, the bushing
End shield includes bottom shielding of bushing seat and the end shield lead on described sleeve pipe end shield seat, and it is anti-that the ground shield includes ground connection
Shield inner cover, ground shield outer cover and end shield lead extension rod, wherein described sleeve pipe end shield seat and the ground shield
Inner cover is connected, the ground shield inner cover is connected with the ground shield outer cover, and the ground shield outer cover is reliable
Grounding body, so as to ensure that the safe and reliable ground connection of the end shield of high-voltage bushing, the end shield lead prolongs with the end shield lead
Stock is connected, and extends described sleeve pipe end shield lead-out wire, during the actual charging operation of bushing, the bushing major insulation
Leakage current is transmitted to the end shield lead extension rod by the end shield lead, and the end shield lead extension rod is described in
Ground shield inner cover is connected with the ground shield outer cover, because described sleeve pipe end shield seat is grounding body, therefore can protect
The end shield lead extension rod reliable ground is demonstrate,proved, it is (offline to carry out customary State Overhaul Test or preventive trial in bushing
Experiment) when, end shield of high-voltage bushing will not be completely exposed in air, and then ensures that above-mentioned experiment is larger even in overcast and rainy or moisture
Weather under can also carry out, improve scene have a power failure during time availability；And at the trial, it is not necessary to integral demounting, institute
Ground shield inner cover is stated without dismounting, only the ground shield outer cover need to be opened, can carry out correlation test, therefore can be with
Protective action is played to end shield of high-voltage bushing, effectively reduces the dismounting number of end shield of high-voltage bushing ground shield；It is described to connect
Measuring coil is installed between the inwall of ground protective cover inner cover and the end shield lead extension rod, along the ground shield inner cover
Outer wall measurement line connection-peg is installed, the lead-out terminal of the measuring coil is connected with one end of signal extraction line, the letter
Number extraction line the other end with it is described measure line connection-peg be connected, the measuring coil is obtained by electromagnetic induction principle, measurement
The leakage current of the end shield lead extension rod is flowed through, and corresponding output signal is transmitted to the survey by signal extraction line
Line connection-peg is measured, is used by the measurement line connection-peg for bushing state on_line monitoring, is that bushing state is online
Monitoring provides safe and reliable leakage current measurement data, reaches the powered effect monitored in real time of bushing state.
2. end shield of high-voltage bushing ground shield of the present invention, it is also equipped with along the outer wall of the ground shield inner cover
Light-emitting device, and the light-emitting device is connected with the signal extraction line, the leakage for flowing through the end shield lead extension rod
Electric current, transmitted and to the light-emitting device, exported to the signal of the light-emitting device through over commutation mould by the signal extraction line
Block provides DC input voitage for the light-emitting device, the light-emitting device is lighted, only when above-mentioned end shield ground connection is reliable,
The input voltage that the light-emitting device can just be stablized, therefore the luminous situation that can observe by the naked eye the light-emitting device is come
Intuitive judgment end shield Grounding, if the situation that the light-emitting device occurs flashing or do not worked, so that it may judge end shield of high-voltage bushing
There is imperfect earth or unearthed situation, play a part of providing warning for live patrol officer.
Obviously, above-described embodiment is only intended to clearly illustrate example, not to the restriction of embodiment.For
For those of ordinary skill in the art, other multi-form changes can also be made on the basis of the above description or are become
It is dynamic.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change or change thus extended out
Among moving still in the protection domain of the invention.
Claims (10)
1. a kind of end shield of high-voltage bushing ground shield, is installed on end shield of high-voltage bushing, the end shield of high-voltage bushing includes set
Pipe end shield seat and the end shield lead on described sleeve pipe end shield seat, it is characterised in that：The ground shield includes and institute
State the connected ground shield inner cover of bottom shielding of bushing seat, the ground shield outer cover being connected with the ground shield inner cover and
The end shield lead extension rod being connected with the end shield lead, wherein the end shield lead extension rod is passed through in the ground shield
Cover is connected with the ground shield outer cover, pacifies between the inwall of the ground shield inner cover and the end shield lead extension rod
Equipped with measuring coil, measurement line connection-peg, the output of the measuring coil are installed along the outer wall of the ground shield inner cover
Terminal is connected with one end of signal extraction line, and the other end of the signal extraction line is connected with the measurement line connection-peg.
2. end shield of high-voltage bushing ground shield according to claim 1, it is characterised in that：Along the ground shield inner cover
Outer wall be also equipped with light-emitting device, and the light-emitting device is connected with the signal extraction line.
3. end shield of high-voltage bushing ground shield according to claim 1, it is characterised in that：The end shield lead extension rod
Middle part is provided with spring members.
4. end shield of high-voltage bushing ground shield according to claim 3, it is characterised in that：The end shield lead extension rod
Outer cover is provided with insulation sleeve, and the insulation sleeve is arranged on the contact jaw with the end shield lead between the spring members
On end shield lead extension rod.
5. end shield of high-voltage bushing ground shield according to claim 1, it is characterised in that：The ground shield inner cover
Inwall is provided with shielding liner.
6. end shield of high-voltage bushing ground shield according to claim 5, it is characterised in that：The measuring coil and the screen
Cover and be provided with insulation sleeve between liner, the measuring coil is between the insulation sleeve and the end shield lead extension rod.
7. end shield of high-voltage bushing ground shield according to claim 1, it is characterised in that：The ground shield outer cover with
The joint of the ground shield inner cover is provided with the first Butt sealing groove and docking silk mouth.
8. end shield of high-voltage bushing ground shield according to claim 1, it is characterised in that：The ground shield inner cover with
The joint of described sleeve pipe end shield seat is provided with the second Butt sealing groove and connecting filament mouth.
9. a kind of end shield of high-voltage bushing, including bottom shielding of bushing seat and the end shield lead on described sleeve pipe end shield seat, it is special
Sign is：Also include the end shield of high-voltage bushing ground shield in claim 1-8 described in any one.
10. end shield of high-voltage bushing according to claim 9, it is characterised in that：The outer wall of the end shield lead is arranged with end shield
Lead wire insulation set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710787161.3A CN107677916B (en) | 2017-09-04 | 2017-09-04 | High-voltage bushing tap grounding protective cover and high-voltage bushing tap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710787161.3A CN107677916B (en) | 2017-09-04 | 2017-09-04 | High-voltage bushing tap grounding protective cover and high-voltage bushing tap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107677916A true CN107677916A (en) | 2018-02-09 |
| CN107677916B CN107677916B (en) | 2020-07-14 |
Family
ID=61135716
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710787161.3A Active CN107677916B (en) | 2017-09-04 | 2017-09-04 | High-voltage bushing tap grounding protective cover and high-voltage bushing tap |
Country Status (1)
| Country | Link |
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| CN (1) | CN107677916B (en) |
Cited By (3)
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| CN110208637A (en) * | 2019-06-20 | 2019-09-06 | 国网天津市电力公司电力科学研究院 | A kind of isolated on-Line Monitor Device and its method of DC bushing end shield ground connection |
| CN113903535A (en) * | 2021-09-01 | 2022-01-07 | 深圳供电局有限公司 | High-voltage bushing tap grounding device |
| US11823815B2 (en) | 2018-08-30 | 2023-11-21 | Hitachi Energy Ltd | Shield for a terminal of a high-voltage electrical device and method for operating the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110208637B (en) * | 2019-06-20 | 2021-04-20 | 国网天津市电力公司电力科学研究院 | Isolated online monitoring device and method for direct-current bushing tap grounding |
| CN113903535A (en) * | 2021-09-01 | 2022-01-07 | 深圳供电局有限公司 | High-voltage bushing tap grounding device |
| CN113903535B (en) * | 2021-09-01 | 2023-08-25 | 深圳供电局有限公司 | High-voltage bushing end screen grounding device |
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| CN107677916B (en) | 2020-07-14 |
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