CN112467597A - Electric connection assembly and high-voltage switch using same - Google Patents
Electric connection assembly and high-voltage switch using same Download PDFInfo
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- CN112467597A CN112467597A CN202011196404.4A CN202011196404A CN112467597A CN 112467597 A CN112467597 A CN 112467597A CN 202011196404 A CN202011196404 A CN 202011196404A CN 112467597 A CN112467597 A CN 112467597A
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- flange
- assembly
- voltage switch
- arrester
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0358—Connections to in or out conductors
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- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention relates to the field of high-voltage switches, in particular to an electric connection assembly and a high-voltage switch using the same. The electric connection assembly comprises a cylinder, a conductor assembly and an insulator. The cylinder is provided with a first flange, a second flange, a third flange and an access cover, the first flange is used for being connected with an inlet wire and an outlet wire of the high-voltage switch at intervals, the second flange is used for being connected with a lightning arrester, and the third flange is used for being connected with a mutual inductor; the conductor assembly is used for connecting the wire inlet and outlet interval of the high-voltage switch, the lightning arrester and the mutual inductor, a detachable section is arranged on the conductor assembly, the detachable section is arranged corresponding to the barrel access cover, and the detachable section can be detached from the access cover of the barrel; the insulator is arranged at the first flange of the cylinder body and used for conducting gas isolation on the cylinder body and the inlet and outlet wire of the high-voltage switch at intervals, and one end of the conductor assembly penetrates through the insulator. The electric connection component solves the problems of high cost and poor reliability of the voltage transformer with the bypass at the interval between the inlet wire and the outlet wire of the high-voltage switch and the front end fracture of the lightning arrester.
Description
Technical Field
The invention relates to the field of high-voltage switches, in particular to an electric connection assembly and a high-voltage switch using the same.
Background
With the increasing demand of electric power in China and the continuous progress of the electric power system technology, high-voltage electrical equipment is rapidly developed. Compared with open-type equipment, gas insulated metal enclosed switch (GIS) equipment has the advantages of compact structure, small occupied area, strong environmental adaptability, less daily maintenance and the like, and is widely applied to power systems.
In a 110kV GIS, a break is required to be designed at the front end of an arrester (namely, between the voltage transformer and the space between an incoming line and an outgoing line) and the voltage transformer for bypassing the space between the incoming line and the outgoing line. At present, all the fractures are designed to be bypass isolating switch schemes, namely, the bypass isolating switch is adopted as the fracture. The bypass isolating switch is used as a fracture, and the following problems exist: firstly, a shell and an inner conductor of the bypass isolating switch are both castings, and an isolating operation mechanism is required to be equipped for fracture operation, so that the cost is high; then, the bypass isolating switch, the lightning arrester and the voltage transformer are connectedAll the sensors need to design independent insulators, so that a section of transition cylinder body must be designed for a bypass to carry out butt joint of a lightning arrester or a voltage transformer, the structure not only increases the manufacturing cost of the transition cylinder body, but also causes the bypass to be large in isolation air chamber, and increases SF6The amount of greenhouse gas used; finally, when a voltage transformer or an arrester has a problem or a fault, the bypass isolating switch may have the problem of misoperation of an operating system, and the maintenance risk may be increased.
In summary, in the existing high-voltage switch, the problems of high cost and poor reliability exist in the break at the front end of the voltage transformer and the arrester of the bypass voltage transformer with the line spacing between the incoming line and the outgoing line.
Disclosure of Invention
The invention aims to provide an electric connection assembly to solve the problems of high cost and poor reliability of a front end fracture of a bypass voltage transformer and an arrester at an interval between an incoming line and an outgoing line of the existing high-voltage switch.
Meanwhile, the invention also aims to provide a high-voltage switch using the electric connection assembly.
The electric connection component adopts the following technical scheme: an electrical connection assembly comprising:
the high-voltage switch comprises a cylinder body, a first flange, a second flange, a third flange and an access cover, wherein the first flange is used for being connected with an inlet wire and an outlet wire of the high-voltage switch at intervals, the second flange is used for being connected with an arrester, and the third flange is used for being connected with a mutual inductor;
the conductor assembly is used for connecting the wire inlet and outlet interval of the high-voltage switch, the lightning arrester and the mutual inductor, and is provided with a detachable section which is arranged corresponding to the barrel access cover and can be detached from the access cover of the barrel;
the insulator is arranged at the first flange of the cylinder body and used for conducting gas isolation on the cylinder body and the inlet and outlet wires of the high-voltage switch at intervals, and one end of the conductor component penetrates through the insulator.
Has the advantages that: the electric connection component can be connected with the inlet and outlet wires of the high-voltage switch at intervals through the first flange, connected with the lightning arrester and the mutual inductor through the second flange and the third flange, and can achieve the purpose of disconnecting the inlet and outlet wire intervals from the lightning arrester and the mutual inductor by disassembling the detachable section of the conductor component. In addition, the insulator can realize the air isolation between the barrel and the wire inlet and outlet interval of the high-voltage switch, the barrel is used as an independent air chamber to separate the voltage transformer air chamber, the arrester air chamber and the main loop air chamber, and when the voltage transformer and the arrester are overhauled, only the pressure of the independent air chamber is required to be released, so that the consumption of sulfur hexafluoride gas can be reduced, and the overhauling efficiency is improved. In conclusion, the electric connection assembly solves the problems of high cost and poor reliability of the voltage transformer with the high-voltage switch incoming and outgoing line interval bypass and the front end fracture of the lightning arrester.
Furthermore, the overhaul cover is provided with an adsorbent for purifying sulfur hexafluoride gas in the cylinder body in use. The adsorbent can carry out an wife on impurities generated in the cylinder in the working process of the high-voltage switch, so that the effects of purifying sulfur hexafluoride gas in the cylinder and prolonging the normal service cycle of the electric connection assembly are achieved.
Furthermore, the detachable section comprises a first connecting end and a second connecting end which are opposite, the first connecting end and the second connecting end are connected with other parts of the conductor assembly through detachable fasteners, a concave part is arranged between the first connecting end and the second connecting end, and the fasteners of the first connecting end and the second connecting end can be detached from the concave part. The first connecting end and the second connecting end are connected with other parts of the conductor assembly through the detachable fasteners, and the concave parts are arranged, so that more convenience can be brought to the disassembly and assembly of the detachable section of the conductor assembly.
Still further, the removable fastener is a fastening screw. The fastening screw is used as a fastening piece, and the device has the advantages of simple structure and convenience in installation.
Furthermore, one end of the conductor assembly connected with the insulator comprises a contact and a conductive rod which is inserted into the contact in a sliding mode, and the insulator is penetrated through the contact. The structure that the contact is matched with the conducting rod can facilitate the position adjustment of the conductor assembly in the corresponding direction.
Further, a portion of the conductor assembly is fixedly connected to the surge arrester and is removable with the surge arrester from the barrel. The installation and maintenance of the electrical connection assembly of the invention are facilitated when a portion of the conductor assembly can be moved out of the barrel with the arrester.
Further, the part of the conductor assembly that can be moved out of the barrel with the arrester is a casting. The casting type structure has the advantages of easy shape control and low processing cost.
Furthermore, a mutual inductor connecting assembly is arranged at the third flange of the barrel body and comprises a sealing cover and a connecting barrel arranged on the sealing cover. The sealing cover and the upper connecting cylinder are convenient to be connected with the mutual inductor under the condition of ensuring the sealing in the cylinder body.
Further, at least one of the conductor assemblies has both the surge arrester connection portion and the transformer connection portion to form a common conductor assembly for connecting the surge arrester and the transformer, respectively. The common conductor assembly can reduce the number of conductor assemblies, simplify the structure and reduce the cost.
The high-voltage switch adopts the following technical scheme: high tension switchgear, including business turn over line interval, arrester and mutual-inductor, business turn over line interval, arrester and mutual-inductor pass through electric connection component to be connected, electric connection component includes:
the high-voltage switch comprises a cylinder body, a first flange, a second flange, a third flange and an access cover, wherein the first flange is used for being connected with an inlet wire and an outlet wire of the high-voltage switch at intervals, the second flange is used for being connected with an arrester, and the third flange is used for being connected with a mutual inductor;
the conductor assembly is used for connecting the wire inlet and outlet interval of the high-voltage switch, the lightning arrester and the mutual inductor, and is provided with a detachable section which is arranged corresponding to the barrel access cover and can be detached from the access cover of the barrel;
the insulator is arranged at the first flange of the cylinder body and used for conducting gas isolation on the cylinder body and the inlet and outlet wires of the high-voltage switch at intervals, and one end of the conductor component penetrates through the insulator.
Furthermore, the overhaul cover is provided with an adsorbent for purifying sulfur hexafluoride gas in the cylinder body in use.
Furthermore, the detachable section comprises a first connecting end and a second connecting end which are opposite, the first connecting end and the second connecting end are connected with other parts of the conductor assembly through detachable fasteners, a concave part is arranged between the first connecting end and the second connecting end, and the fasteners of the first connecting end and the second connecting end can be detached from the concave part.
Still further, the removable fastener is a fastening screw.
Furthermore, one end of the conductor assembly connected with the insulator comprises a contact and a conductive rod which is inserted into the contact in a sliding mode, and the insulator is penetrated through the contact.
Further, a portion of the conductor assembly is fixedly connected to the surge arrester and is removable with the surge arrester from the barrel.
Further, the part of the conductor assembly that can be moved out of the barrel with the arrester is a casting.
Furthermore, a mutual inductor connecting assembly is arranged at the third flange of the barrel body and comprises a sealing cover and a connecting barrel arranged on the sealing cover.
Further, at least one of the conductor assemblies has both the surge arrester connection portion and the transformer connection portion to form a common conductor assembly for connecting the surge arrester and the transformer, respectively.
Drawings
FIG. 1 is a schematic structural view of the electrical connection assembly of the present invention (with a surge arrester and a transformer);
FIG. 2 is a first disassembled schematic view of the electrical connection assembly of FIG. 1;
FIG. 3 is a second disassembled schematic view of the electrical connection assembly of FIG. 1;
FIG. 4 is a third disassembled schematic view of the electrical connection assembly of FIG. 1;
fig. 5 is a schematic diagram of the structure of the high voltage switch of the present invention.
In fig. 1: 11-cylinder, 111-first flange, 112-second flange, 113-third flange, 114-access cover, 12-conductor assembly, 121-detachable section, 122-lower contact, 123-lower conducting rod, 124-upper conducting rod, 125-cast conductor, 13-insulator, 14-lightning arrester, 141-lightning arrester insulator, 15-transformer, 16-transformer conducting rod, 17-sealing cover, 18-connecting cylinder.
In fig. 2: 11-cylinder, 111-first flange, 112-second flange, 113-third flange, 114-access cover, 12-conductor assembly, 122-lower contact, 123-lower conducting rod, 124-upper conducting rod, 125-cast conductor, 13-insulator, 14-arrester, 141-arrester insulator, 15-transformer, 16-transformer conducting rod, 17-sealing cover, 18-connecting cylinder.
In fig. 3: 11-cylinder, 111-first flange, 112-second flange, 113-third flange, 114-access cover, 12-conductor assembly, 122-lower contact, 123-lower conducting rod, 125-cast conductor, 13-insulator, 14-arrester, 141-arrester insulator, 15-transformer, 16-transformer conducting rod, 17-sealing cover, 18-connecting cylinder.
In fig. 4: 11-cylinder, 111-first flange, 112-second flange, 113-third flange, 114-access cover, 122-lower contact, 123-lower conducting rod, 125-cast conductor, 13-insulator, 14-arrester, 141-arrester insulator, 15-mutual inductor, 17-sealing cover, 18-connecting cylinder.
In fig. 5: 14-lightning arrester, 15-mutual inductor, 201-incoming and outgoing line interval, 202-electric connection component.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, shall fall within the protection scope of the invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
As shown in fig. 1-4, the electrical connection assembly includes a barrel 11, a conductor assembly 12, and an insulator 13.
The cylinder 11 has a first flange 111, a second flange 112, a third flange 113 and an access cover 114, the first flange 111 is used for connecting with the inlet and outlet wires of the high-voltage switch at intervals, the second flange 112 is used for connecting with the lightning arrester 14, and the third flange 113 is used for connecting with the mutual inductor 15. In this embodiment, the first flange 111 and the third flange 113 are located at two ends of the cylinder 11, the third flange 113 is located at one side of the cylinder 11, and the access cover 114 is located at the opposite side of the cylinder 11 from the third flange 113. The access cover 114 is an adsorbent cover on which an adsorbent is arranged, and the adsorbent is used for purifying sulfur hexafluoride gas filled in the cylinder 11 when in use, and the specific components can be selected from mature products in the prior art according to actual requirements.
The conductor assembly 12 is used for connecting the access line interval of the high-voltage switch with the lightning arrester 14 and the mutual inductor 15, a detachable section 121 is arranged on the conductor assembly 12, the detachable section 121 is arranged corresponding to the access cover 114 of the cylinder body, and the detachable section 121 can be detached from the access cover 114 of the cylinder body 11. Specifically, in the present embodiment, there are two conductor assemblies 12, and the electrical connection assembly can be used for a single-phase voltage transformer, and for convenience of description, one of the two conductor assemblies is defined as a first conductor assembly, and the other is defined as a second conductor assembly.
Common to both the first conductor assembly and the second conductor assembly is that they include, from bottom to top, a lower contact 122, a lower conductive rod 123, a removable section 121, an upper conductive rod 124, and a cast conductor 125. The first conductor assembly differs from the second conductor assembly in that the first conductor assembly comprises, in addition to the above-mentioned components, a transformer conducting rod 16 connected to the transformer 15. The lower conducting rods 123 of the first conductor assembly and the second conductor assembly are inserted into the corresponding lower contacts in a vertically slidable manner, the detachable section 121 is connected between the upper conducting rod 124 and the lower conducting rod 123, is located at a position substantially equal to the height of the access cover 114 and comprises a first connecting end and a second connecting end which are opposite, the first connecting end and the second connecting end are connected with other parts of the conductor assembly through detachable fasteners, a concave part is arranged between the first connecting end and the second connecting end, and the fasteners of the first connecting end and the second connecting end can be detached from the concave part. In this embodiment, the removable section 121 is shaped like a horseshoe, and is a casting, and the upper and lower center positions are designed with through holes, and the removable fastener specifically adopts a fastening screw. With the fastening screws unsecured, the removable section 121 may be moved upwardly by a certain amount to facilitate removal. The lower end of the transformer rod 16 is inserted into the cast conductor of the first conductor assembly, thereby providing the first conductor assembly with both the arrester connection part and the transformer connection part, forming a common conductor assembly. In other embodiments, the number of conductor assemblies 12 may be set according to actual requirements, for example, when the transformer is a three-phase transformer, at least three conductor assemblies should be provided.
The insulator 13 is arranged at the lower end of the cylinder 11, namely one end of the interval for connecting the high-voltage switch, and the lower contact of the conductor component 12 penetrates through the insulator 13, so that the electrical connection with the main loop of the high-voltage switch can be realized, meanwhile, the insulator 13 can isolate the cylinder 11 from the interval of the inlet and outlet wires of the high-voltage switch in an air way, so that the cylinder 11 and the inlet and outlet wires of the high-voltage switch form independent air chambers respectively, and the air chambers can be charged and discharged independently.
The cast conductor 125 is fixedly connected to the insulator of the surge arrester 14, i.e., the surge arrester insulator 141, and can be removed from the second flange with the surge arrester when the surge arrester is removed after being detached from the lower contact and the lower conductive rod.
A mutual inductor connecting assembly is arranged at the third flange 113 of the cylinder 11, and comprises a sealing cover 17 and a connecting cylinder 18 arranged on the sealing cover 17. The upper end of the connecting cylinder 18 is fixedly connected with the lower end of the mutual inductor 15, and the lower end is fixedly connected with the sealing cover 17.
Embodiment of the high-voltage switch:
as shown in fig. 5, the high voltage switch comprises an incoming and outgoing line compartment 201, a lightning arrester 14 and a transformer 15, wherein the incoming and outgoing line compartment 201, the lightning arrester 14 and the voltage transformer 15 are connected through an electrical connection assembly 202 of the above embodiment. Before the entire station is voltage-proof, the point connector assembly 202, the voltage transformer 15 and the lightning arrester 14 are completely installed, wherein the upper conducting rod 121 and the detachable segment 124 are not installed and butted, so that the voltage transformer 15 and the lightning arrester 14 are separated from the incoming and outgoing lines in a disconnected state, as shown in fig. 3. After the voltage resistance is finished, the upper conducting rod 121 and the detachable section 124 are installed to the state shown in fig. 1, namely, the voltage transformer and the lightning arrester are electrically connected with the main wiring, and then the voltage transformer and the lightning arrester are inflated and electrified to operate, so that the whole process is simple and fast to operate.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. An electrical connection assembly, comprising:
the high-voltage switch comprises a cylinder body, a first flange, a second flange, a third flange and an access cover, wherein the first flange is used for being connected with an inlet wire and an outlet wire of the high-voltage switch at intervals, the second flange is used for being connected with an arrester, and the third flange is used for being connected with a mutual inductor;
the conductor assembly is used for connecting the wire inlet and outlet interval of the high-voltage switch, the lightning arrester and the mutual inductor, and is provided with a detachable section which is arranged corresponding to the barrel access cover and can be detached from the access cover of the barrel;
the insulator is arranged at the first flange of the cylinder body and used for conducting gas isolation on the cylinder body and the inlet and outlet wires of the high-voltage switch at intervals, and one end of the conductor component penetrates through the insulator.
2. The electrical connection assembly of claim 1, wherein the access cover is provided with an adsorbent for purging sulphur hexafluoride gas from the cartridge in use.
3. The electrical connection assembly of claim 1 or claim 2, wherein the detachable section comprises first and second opposing connection ends, each of the first and second connection ends being connected to the remainder of the conductor assembly by a detachable fastener, the first and second connection ends having a recess therebetween from which the fasteners of the first and second connection ends can be removed and installed.
4. The electrical connection assembly of claim 3, wherein the removable fastener is a fastening screw.
5. The electrical connection assembly of claim 1 or claim 2, wherein the end of the conductor assembly connected to the insulator comprises a contact through which the insulator passes and a conductive rod slidably inserted into the contact.
6. The electrical connection assembly of claim 1 or 2, wherein a portion of the conductor assembly is fixedly connected to the surge arrester and is removable with the surge arrester from the barrel.
7. The electrical connection assembly of claim 6, wherein the portion of the conductor assembly that is removable from the barrel with the arrester is a casting.
8. The electrical connection assembly as claimed in claim 1 or 2, wherein a transformer connection assembly is provided at the third flange of the barrel, the transformer connection assembly comprising a sealing cover and a connection barrel provided on the sealing cover.
9. The electrical connection assembly according to claim 1 or 2, wherein at least one of the conductor assemblies has both a surge arrester connection portion and a transformer connection portion to form a common conductor assembly for connecting a surge arrester and a transformer, respectively.
10. High voltage switch comprising an access line compartment, an arrester and a transformer, characterized in that the access line compartment, the arrester and the transformer are connected by an electrical connection assembly according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011196404.4A CN112467597A (en) | 2020-10-30 | 2020-10-30 | Electric connection assembly and high-voltage switch using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011196404.4A CN112467597A (en) | 2020-10-30 | 2020-10-30 | Electric connection assembly and high-voltage switch using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112467597A true CN112467597A (en) | 2021-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011196404.4A Pending CN112467597A (en) | 2020-10-30 | 2020-10-30 | Electric connection assembly and high-voltage switch using same |
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| Country | Link |
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| CN (1) | CN112467597A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113539615A (en) * | 2021-07-19 | 2021-10-22 | 浙江日新电气有限公司 | Transformer with neutral point protection device and adsorbent filling method thereof |
| CN113922265A (en) * | 2021-09-16 | 2022-01-11 | 中国电建集团河北省电力勘测设计研究院有限公司 | 500kV HGIS power distribution device |
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| JPS59159128U (en) * | 1983-04-11 | 1984-10-25 | 株式会社東芝 | Detachable busbar |
| US20040037025A1 (en) * | 2002-08-06 | 2004-02-26 | Mitsubishi Denki Kabushiki Kaisha | Hybrid gas-insulated switchgear |
| CN101527431A (en) * | 2009-04-13 | 2009-09-09 | 中国西电电气股份有限公司 | Supervoltage/extra-high voltage GIS isolating device |
| CN210016172U (en) * | 2019-08-19 | 2020-02-04 | 西安西电高压开关有限责任公司 | Box-sharing type multifunctional detachable device for GIS |
| CN110994432A (en) * | 2019-11-21 | 2020-04-10 | 许继（厦门）智能电力设备股份有限公司 | Tee bend module |
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2020
- 2020-10-30 CN CN202011196404.4A patent/CN112467597A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59159128U (en) * | 1983-04-11 | 1984-10-25 | 株式会社東芝 | Detachable busbar |
| US20040037025A1 (en) * | 2002-08-06 | 2004-02-26 | Mitsubishi Denki Kabushiki Kaisha | Hybrid gas-insulated switchgear |
| CN101527431A (en) * | 2009-04-13 | 2009-09-09 | 中国西电电气股份有限公司 | Supervoltage/extra-high voltage GIS isolating device |
| CN210016172U (en) * | 2019-08-19 | 2020-02-04 | 西安西电高压开关有限责任公司 | Box-sharing type multifunctional detachable device for GIS |
| CN110994432A (en) * | 2019-11-21 | 2020-04-10 | 许继（厦门）智能电力设备股份有限公司 | Tee bend module |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113539615A (en) * | 2021-07-19 | 2021-10-22 | 浙江日新电气有限公司 | Transformer with neutral point protection device and adsorbent filling method thereof |
| CN113539615B (en) * | 2021-07-19 | 2022-02-11 | 浙江日新电气有限公司 | Transformer with neutral point protection device and adsorbent filling method thereof |
| CN113922265A (en) * | 2021-09-16 | 2022-01-11 | 中国电建集团河北省电力勘测设计研究院有限公司 | 500kV HGIS power distribution device |
| CN113922265B (en) * | 2021-09-16 | 2024-05-28 | 中国电建集团河北省电力勘测设计研究院有限公司 | 500KV HGIS power distribution device |
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