CN107991585B - Basin-type insulator voltage withstand test device - Google Patents
Basin-type insulator voltage withstand test device Download PDFInfo
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- CN107991585B CN107991585B CN201710987174.5A CN201710987174A CN107991585B CN 107991585 B CN107991585 B CN 107991585B CN 201710987174 A CN201710987174 A CN 201710987174A CN 107991585 B CN107991585 B CN 107991585B
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- 239000012212 insulator Substances 0.000 title claims abstract description 92
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 239000004677 Nylon Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a withstand voltage test device for a basin-type insulator. The basin-type insulator voltage withstand test device comprises a tank body used for containing a basin-type insulator voltage withstand tool, wherein a fixed conductive piece which stretches towards the interior of the tank body is arranged on the tank body, a movable conductive piece which stretches towards the fixed conductive piece and is used for being electrically connected with the fixed conductive piece is arranged on the basin-type insulator voltage withstand tool, and a conductive spring which is used for achieving electrical connection between the fixed conductive piece and the movable conductive piece is arranged on one of the fixed conductive piece and the movable conductive piece. The movable conductive piece and the fixed conductive piece in the voltage withstand test device realize the electrical connection of the movable conductive piece and the fixed conductive piece through the conductive spring, prevent the virtual connection of a circuit through the pre-deformation of the conductive spring and have reliable contact.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a basin-type insulator voltage withstand test device.
Background
The 1100kV basin-type insulator is a core insulating part of the 1100kV GIS, and the insulation reliability of the basin-type insulator plays a crucial role in the 1100kV power supply system. The basin insulator has the dual functions of partitioning the air chamber and supporting the conductor, and is widely used in GIS. The performance of the basin-type insulator directly affects the performance of the GIS, so that the basin-type insulator is very necessary to carry out a pressure resistance test before leaving a factory. As shown in fig. 1, when a voltage withstand test is performed on a basin-type insulator in the prior art, the basin-type insulator is generally assembled in a bus bar manner, although the number of tests (8 tests) per time is increased, the frequency of electrical performance test failures of the basin-type insulator 3 is high, and if the electrical performance fails, the assembled basin-type insulator is disassembled, so that the workload is greatly increased. In order to prevent gas from leaking during the electrical performance test, the sealing ring 30 needs to be installed between the barrel 2 and the basin-type insulator 3, and the sealing ring 30 needs to be detached when the insulator is detached after the electrical performance test is finished, so that the assembly is complex and tedious, and the efficiency is extremely low.
The utility model discloses a grant utility model patent that bulletin number is CN204347192U discloses a withstand voltage test device for basin formula insulator, including filling SF6The jar of gaseous jar body is equipped with the dolly and places withstand voltage frock on the dolly in the jar body, withstand voltage frock including the casing that is used for packing into the basin type insulator, be used for with basin type insulator electric connection's conductor spare and conducting block, the conducting block is used for being connected basin type insulator and jar high-voltage end of the body. A conducting block that is used for in this withstand voltage frock being connected with the high-voltage end needs to aim at the screw hole threaded connection on the inserts of basin formula insulator, troublesome poeration, and the machining precision requirement to the frock is higher to do not set up high-voltage shield assembly at the end, the high-voltage discharge problem that relevant part caused can't be avoided.
Disclosure of Invention
The invention aims to provide a basin-type insulator voltage-withstanding device, which aims to solve the technical problem of virtual connection of a circuit when a basin-type insulator and a tank body are in circuit connection in the prior art.
In order to achieve the purpose, the technical scheme 1 adopted by the basin-type insulator voltage withstand test device provided by the invention is as follows: the utility model provides a basin type insulator withstand voltage test device, is including the jar body that is used for holding the withstand voltage frock of basin type insulator, is equipped with the fixed electrically conductive piece of overhanging in the jar body, be equipped with on the withstand voltage frock of basin type insulator towards fixed electrically conductive piece overhanging, be used for with fixed electrically conductive piece electric connection's activity electrically conductive piece, be equipped with the electrically conductive spring that is used for realizing both electric connection on fixed electrically conductive piece and one of them of the electrically conductive piece of activity.
The invention has the beneficial effects that: the movable conductive piece and the fixed conductive piece in the voltage withstand test device realize the electrical connection of the movable conductive piece and the fixed conductive piece through the conductive spring, prevent the virtual connection of a circuit through the pre-deformation of the conductive spring and have reliable contact.
On the basis of the technical scheme 1 of the basin-type insulator voltage withstand test device, the technical scheme 2 is obtained by improvement: the movable conductive piece comprises a conductive rod, and the conductive spring is sleeved on the conductive rod. The conductive spring is directly sleeved on the conductive rod, and the structure is simple and the installation is convenient.
On the basis of the technical scheme 2 of the basin-type insulator voltage withstand test device, the technical scheme 3 is obtained by improvement: one of the fixed conductive piece and the movable conductive piece is provided with a conductive disc. Increase area of contact through electrically conductive dish, reduced the activity and electrically conductive the cooperation precision between the piece and the fixed electrically conductive piece, need not the alignment grafting, improve the installation effectiveness.
On the basis of technical scheme 3 of the basin-type insulator voltage withstand test device, the technical scheme 4 is obtained by improvement: the movable conductive piece is provided with a conductive spring, the fixed conductive piece comprises a conductive disc, and the conductive disc is provided with a conductive side face which is used for being in abutting fit with the conductive spring.
On the basis of technical scheme 4 of the basin-type insulator voltage withstand test device, the technical scheme 5 is obtained by improvement: the fixed conductive piece comprises a conductive tube and a conductive disc positioned at the overhanging end part of the conductive tube, and the conductive disc supports the fixed conductive tube through a threaded connecting piece facing one side of the conductive tube.
On the basis of the technical scheme 5 of the basin-type insulator voltage withstand test device, the technical scheme 6 is obtained by improvement: one side of deviating from electrically conductive spring on the electrically conductive dish is equipped with the first shield cover along the axial extension of electrically conductive dish, and first shield cover has the opening that is used for passing through the electrically conductive pipe. The first shield can shield an amount of discharge generated at the end of the conductive tube.
On the basis of technical scheme 6 of the basin-type insulator voltage withstand test device, the technical scheme 7 is obtained by improvement: the opening of the first shielding cover is provided with an inward-turned edge which forms a jacking fit with the peripheral surface of the conductive pipe.
On the basis of technical scheme 4 of the basin-type insulator voltage withstand test device, the technical scheme 8 is obtained by improvement: and one side of the conductive disc, which faces the conductive spring, is provided with a circular second shielding cover which extends along the axial direction of the conductive disc.
On the basis of the technical scheme 8 of the basin-type insulator voltage withstand test device, the technical scheme 9 is obtained by improvement: the conducting disc is of a disc type structure, and the second shielding cover is arranged on the outer peripheral surface of the conducting disc along the circumferential direction.
On the basis of the technical scheme 9 of the basin-type insulator voltage withstand test device, the technical scheme 10 is obtained by improvement: and a third shielding cover extending along the axial direction of the conductive disc is further arranged on one side of the peripheral surface of the conductive disc, which is far away from the conductive spring.
On the basis of the technical scheme 10 of the basin-type insulator voltage withstand test device, the technical scheme 11 is obtained by improvement: the opening of the second shielding cover and/or the third shielding cover is provided with an inward turning edge extending along the circumferential direction of the opening.
On the basis of any one of technical schemes 1 to 10 of the basin-type insulator withstand voltage test device, a technical scheme 12 is obtained by improving: the pressure-resistant tool for the basin-type insulators comprises at least two barrels and a trolley, the barrels are used for connecting the basin-type insulators into a string, the trolley is used for supporting and fixing the barrels, and fixing blocks which are used for supporting and matching with the peripheral surfaces of the basin-type insulators or the barrels to stop the basin-type insulators from rolling back and forth are arranged on the front side and the rear side of the trolley respectively.
On the basis of the technical scheme 12 of the basin-type insulator voltage withstand test device, the technical scheme 13 is obtained by improvement: the fixed blocks comprise paired nylon cushion blocks which are arranged along the left and right directions of the trolley at intervals.
On the basis of any one of technical schemes 1 to 10 of the basin-type insulator voltage withstand test device, a technical scheme 14 is obtained by improving: the tail end of the cylinder is electrically connected with a grounding wire.
Drawings
FIG. 1 is a schematic structural diagram of a basin-type insulator voltage-withstanding device in the prior art;
FIG. 2 is a schematic structural diagram of the basin insulator voltage withstanding device provided by the present invention;
fig. 3 is a schematic view illustrating the connection between a fixed conductive member and a movable conductive member in the pressure withstanding device of a basin-type insulator shown in fig. 2;
fig. 4 is a schematic structural view of a fixed conductive member in the basin insulator withstand voltage apparatus shown in fig. 2;
fig. 5 is a side view of a basin insulator voltage withstand tool in the basin insulator voltage withstand device shown in fig. 2.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 2 to 4, the embodiment of the basin-type insulator voltage withstand device of the present invention includes a tank 1 for accommodating a basin-type insulator voltage withstand tool, the tank is provided with a fixed conductive member overhanging toward the inside of the tank, the basin-type insulator voltage withstand tool is provided with a movable conductive member overhanging toward the fixed conductive member and electrically connected to the fixed conductive member, and one of the fixed conductive member and the movable conductive member is provided with a conductive spring 5 for electrically connecting the fixed conductive member and the movable conductive member.
The tank body 1 is a hollow cylinder with an opening at one end, the inner cavity of the cylinder is used for containing insulating gas, the opening end of the tank body 1 is detachably provided with a cover plate 11 used for sealing the opening of the tank body 1 so as to seal the inner cavity of the tank body 1, a handle used for assisting in opening the cover plate is arranged on the cover plate 11, the tank body 1 is fixedly provided with an air charging device 12, the air charging device 12 is communicated with the inner cavity of the tank body 1 so as to charge the insulating gas into the tank body 1 or extract the insulating gas from the tank body 1, and a track 13 for guiding and moving the trolley 6.
The basin-type insulator voltage-withstanding tool comprises a barrel 2 and a trolley 6, wherein the barrel 2 is used for connecting a plurality of basin-type insulators 3 into a string, the trolley 6 is used for supporting and fixing the barrel 2, the number of the basin-type insulators 3 is three, the lower portion of the trolley 6 is provided with a roller 61 used for sliding on a rail 13, the front side and the rear side of the trolley 6 are respectively provided with a fixing block 62 used for supporting and matching with the outer peripheral surface of the barrel 2 to stop the basin-type insulators 3 from rolling back and forth, as shown in fig. 5, the fixing blocks 62 are paired nylon cushion blocks arranged at intervals in the left-right direction of the trolley 6, each pair of nylon cushion blocks are matched with the outer peripheral surface of the supporting and stopping barrel in the front-back direction, and.
As shown in fig. 2, the right side is defined as a head end, the left side is defined as a tail end, the cylindrical bodies 2 include cylindrical bodies, the basin-type insulators 3 are inserted into the cylindrical bodies, the end portions of the basin-type insulators are clamped between the flange plates 21 of the two adjacent cylindrical bodies 2, bolts penetrate through the flange plates 21 of the two cylindrical bodies and the basin-type insulators 3 to fix the basin-type insulators, and the adjacent basin-type insulators 3 are electrically connected with connecting rods 32, so that the three basin-type insulators 3 are connected in series. The openings of the three basin-type insulators 3 are arranged forwards, a conducting rod 31 which is suspended towards the fixed conducting piece is fixedly arranged on the front end face of the central conductor of the basin-type insulator at the head end, the conducting spring 5 is sleeved at the suspended end part of the conducting rod 31, the suspended end part is provided with a stopping step of which the stopping surface faces the fixed conducting piece 4 so as to be matched with the fixed conducting piece 4 in a jacking mode to fix the conducting spring 5, the rear end of the basin-type insulator at the tail end is provided with a high-voltage shield 22, and the tail end of the barrel body 2 is electrically connected with a grounding wire 15, so that. The assembly mode of the basin-type insulator in the cylinder body 2 is the same as that in the prior art, but sealing rings do not need to be arranged between the flange plates for sealing, and the head ends of the basin-type insulator 3, the flange plates 21 and the cylinder body 2 are both in an open state so as to enable insulating gas to pass through.
As shown in fig. 3 and 4, the tank 1 is provided with a fixed conductive member 4 which is used for electrically connecting with the test transformer 7 and is suspended in the tank, the fixed conductive member 4 comprises a conductive tube 40 with one end electrically connected with the tank through a contact finger and the other end suspended in the tank, and a conductive disc 41 which is positioned at the suspended end of the conductive tube 40, the conductive disc 41 is of a disc type structure, the conductive disc 41 is provided with a conductive side surface for being in press fit with the conductive spring 5, the conductive tube 40 is of a hollow structure, the suspended end of the conductive tube is provided with an internal thread section, the conductive disc 41 supports the fixed conductive tube 40 through a threaded connecting member 43 which is arranged at one side of the conductive tube 40, the threaded connecting member 43 is of a C-type structure, two side edges of the threaded connecting member 43 are respectively provided with an external thread section which is in spiral fit with the internal thread section of the conductive tube 40, one side of the conductive disc 41 which is far away from, the first shielding cover has an opening for passing through the conductive tube 40, the opening has an inward-turned edge forming a press fit with the outer peripheral surface of the conductive tube 40, the conductive disc 41, the threaded connector 43 and the first shielding cover 44 are respectively provided with through holes correspondingly penetrating in the left-right direction and used for inserting bolts 45, and the conductive disc, the threaded connector 43 and the first shielding cover are fixedly connected through the bolts 45.
The outer peripheral surface of the conductive disc 41 is fixedly provided with a shielding cover extending along the axial direction of the conductive disc, the shielding cover comprises a second shielding cover 42 extending towards one side of the conductive spring 5 and a third shielding cover 46 extending away from one side of the conductive spring 5, and the openings of the second shielding cover 42 and the third shielding cover 46 are provided with inward-turned edges extending along the circumferential direction of the second shielding cover and the third shielding cover.
When in use, the concave-convex surface electrode assembled by the basin-type insulator 3 is assembled, then the cylinder body and the connecting rod 32 are assembled, then the cylinder body and the basin-type insulator 3 are assembled and fixed by bolts, three basin-type insulators are connected together by a flange and placed on the trolley 6, the cylinder body and the basin-type insulators 3 jointly form the cylinder body 2, the cylinder body 2 to be tested is fixed on the trolley 6 by a fixing block 62 to prevent the cylinder body 2 from rolling back and forth, the conducting rod 31 is fixed in the electrode at the concave surface of the basin-type insulator 3, the front end of the conducting rod 31 is sleeved with the conducting spring 5, the conducting disc 41 and the threaded connecting piece 43 are fixed at the rear end of the conducting tube 40, the trolley 6 is pushed forwards to ensure that the conducting spring 5 is fully contacted with the conducting disc 41, finally, the rear end of the cylinder body 2 is connected with a grounding wire 15, so as to be convenient for reliable grounding, the cover plate 11 is closed, and the tank, after that, the voltage was applied to perform a withstand voltage test.
In this embodiment, the basin insulator assembly includes three basin insulators connected in series, but in other embodiments, other numbers are possible.
In this embodiment, the conductive tube in the fixed conductive member is a hollow conductive tube electrically connected to the tank body through the contact finger, and in other embodiments, the conductive tube may have other structures, such as a solid structure.
In this embodiment, the conductive plate in the fixed conductive member is a disc structure and is separated from the conductive tube, but in other embodiments, it may be an integral structure as long as it has a contact surface with a larger area.
In this embodiment, the second shield cover is mounted on the outer circumferential surface of the conductive disc, and in other embodiments, the second shield cover may be a ring-shaped shield cover with an opening mounted on the left side of the conductive disc.
In other embodiments, the conductive spring may be mounted on the fixed conductive member.
In other embodiments, the conductive pads may also be mounted on a movable conductive member.
In other embodiments, the conductive disc may be connected to the conductive tube in other manners, such as clamping.
In other embodiments, the grounding wire can also be connected to other positions on the basin-type insulator voltage-withstanding tool.
Claims (8)
1. The utility model provides a withstand voltage test device of basin formula insulator, is equipped with the fixed electrically conductive piece that stretches in the jar body including the jar body that is used for holding the withstand voltage frock of basin formula insulator, be equipped with on the withstand voltage frock of basin formula insulator towards fixed electrically conductive piece overhang, be used for with fixed electrically conductive piece electric connection's activity electrically conductive piece, its characterized in that: one of the fixed conductive piece and the movable conductive piece is provided with a conductive spring for realizing the electrical connection of the fixed conductive piece and the movable conductive piece; the movable conductive piece is provided with a conductive spring, the fixed conductive piece comprises a conductive disc, the conductive disc is provided with a conductive side face which is used for being in press fit with the conductive spring, the movable conductive piece comprises a conductive rod, the conductive spring is sleeved on the overhanging end part of the conductive rod, the fixed conductive piece comprises a conductive tube and a conductive disc positioned at the overhanging end part of the conductive tube, the conductive disc supports the fixed conductive tube through a threaded connecting piece facing one side of the conductive tube, one side of the conductive disc, which is far away from the conductive spring, is provided with a first shielding cover which extends along the axial direction of the conductive disc, and the first shielding cover is provided with an opening through which the conductive tube passes; and one side of the conductive disc, which faces the conductive spring, is provided with a circular second shielding cover which extends along the axial direction of the conductive disc.
2. The withstand voltage test device of basin-type insulator according to claim 1, characterized in that: the opening of the first shielding cover is provided with an inward-turned edge which forms a jacking fit with the peripheral surface of the conductive pipe.
3. The withstand voltage test device of basin-type insulator according to claim 1, characterized in that: the conducting disc is of a disc type structure, and the second shielding cover is arranged on the outer peripheral surface of the conducting disc along the circumferential direction.
4. The withstand voltage test device of basin-type insulator according to claim 3, characterized in that: and a third shielding cover extending along the axial direction of the conductive disc is further arranged on one side of the peripheral surface of the conductive disc, which is far away from the conductive spring.
5. The withstand voltage test device of basin-type insulator according to claim 4, characterized in that: the opening of the second shielding cover and/or the third shielding cover is provided with an inward turning edge extending along the circumferential direction of the opening.
6. The withstand voltage test device of a basin-type insulator according to any one of claims 1 to 4, characterized in that: the pressure-resistant tool for the basin-type insulators comprises at least two barrels and a trolley, the barrels are used for connecting the basin-type insulators into a string, the trolley is used for supporting and fixing the barrels, and fixing blocks which are used for supporting and matching with the peripheral surfaces of the basin-type insulators or the barrels to stop the basin-type insulators from rolling back and forth are arranged on the front side and the rear side of the trolley respectively.
7. The withstand voltage test device of basin-type insulator according to claim 6, characterized in that: the fixed blocks comprise paired nylon cushion blocks which are arranged along the left and right directions of the trolley at intervals.
8. The withstand voltage test device of basin-type insulator according to claim 6, characterized in that: the tail end of the cylinder is electrically connected with a grounding wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710987174.5A CN107991585B (en) | 2017-10-20 | 2017-10-20 | Basin-type insulator voltage withstand test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710987174.5A CN107991585B (en) | 2017-10-20 | 2017-10-20 | Basin-type insulator voltage withstand test device |
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| Publication Number | Publication Date |
|---|---|
| CN107991585A CN107991585A (en) | 2018-05-04 |
| CN107991585B true CN107991585B (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710987174.5A Active CN107991585B (en) | 2017-10-20 | 2017-10-20 | Basin-type insulator voltage withstand test device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963928B (en) * | 2018-07-20 | 2021-04-20 | 西安交通大学 | A basic unit and piping lane transmission of electricity GIL for among super/special high voltage piping lane transmission of electricity GIL |
| CN113009189A (en) * | 2019-12-19 | 2021-06-22 | 河南平芝高压开关有限公司 | Withstand voltage test device and conductive connection assembly |
| CN112748311A (en) * | 2020-12-07 | 2021-05-04 | 河南平高电气股份有限公司 | GIS on-site voltage withstand testing device and voltage withstand conductor assembly thereof |
Citations (6)
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|---|---|---|---|---|
| CN202166716U (en) * | 2011-06-10 | 2012-03-14 | 平高集团有限公司 | Insulation test device used for superhigh voltage basin-type insulator |
| CN202453457U (en) * | 2012-02-09 | 2012-09-26 | 山东泰开高压开关有限公司 | Withstand voltage tool for 550kV disc insulator |
| CN202661492U (en) * | 2012-07-20 | 2013-01-09 | 山东泰开高压开关有限公司 | Quick connector for insulator testing tool of composite apparatus |
| CN203720308U (en) * | 2014-02-20 | 2014-07-16 | 山东泰开高压开关有限公司 | Multi-type 126kV insulating stand voltage withstanding type tool |
| CN204347192U (en) * | 2014-12-15 | 2015-05-20 | 正泰电气股份有限公司 | Disc insulator Withstand test device |
| CN205450182U (en) * | 2015-12-29 | 2016-08-10 | 平高集团有限公司 | Withstand voltage device of benzvalene form insulator for GIS and benzvalene form insulator fixed bolster thereof |
-
2017
- 2017-10-20 CN CN201710987174.5A patent/CN107991585B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202166716U (en) * | 2011-06-10 | 2012-03-14 | 平高集团有限公司 | Insulation test device used for superhigh voltage basin-type insulator |
| CN202453457U (en) * | 2012-02-09 | 2012-09-26 | 山东泰开高压开关有限公司 | Withstand voltage tool for 550kV disc insulator |
| CN202661492U (en) * | 2012-07-20 | 2013-01-09 | 山东泰开高压开关有限公司 | Quick connector for insulator testing tool of composite apparatus |
| CN203720308U (en) * | 2014-02-20 | 2014-07-16 | 山东泰开高压开关有限公司 | Multi-type 126kV insulating stand voltage withstanding type tool |
| CN204347192U (en) * | 2014-12-15 | 2015-05-20 | 正泰电气股份有限公司 | Disc insulator Withstand test device |
| CN205450182U (en) * | 2015-12-29 | 2016-08-10 | 平高集团有限公司 | Withstand voltage device of benzvalene form insulator for GIS and benzvalene form insulator fixed bolster thereof |
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| CN107991585A (en) | 2018-05-04 |
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