CN107404084A - A kind of compact type environment-protection gas inflated ring main unit - Google Patents
A kind of compact type environment-protection gas inflated ring main unit Download PDFInfo
- Publication number
- CN107404084A CN107404084A CN201710877691.7A CN201710877691A CN107404084A CN 107404084 A CN107404084 A CN 107404084A CN 201710877691 A CN201710877691 A CN 201710877691A CN 107404084 A CN107404084 A CN 107404084A
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- China
- Prior art keywords
- phase
- station
- pole
- gas tank
- main unit
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Classifications
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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
- H02B13/045—Details of casing, e.g. gas tightness
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
A kind of compact type environment-protection gas inflated ring main unit, with cabinet, several closed gas tanks are provided with cabinet, each gas tank is provided with three-phase into and out of thread casing, gas tank is equipped with circuit breaker operation mechanism and isolator operating mechanism built with three station breakers and tri-station isolating switch, gas tank front side；Three station breakers include three-phase pole and interlinked mechanism, insulation booth and enterprising/outlet pole and lower entry/exit line pole are respectively provided with per phase pole, the upper end and front end of insulation booth are in uncovered structure, creeping-increasing skirt is equipped with the madial wall of insulation booth upper/lower terminal, its left and right side wall is provided with the wing edge for extending to its front side and isolating for realizing split-phase；Tri-station isolating switch includes mechanism box and isolator operation axle, isolator operation axle with thirdly the external sheath of station conductive arm has insulating barrier；Compact-sized, clean environment firendly of the invention, multiple gas tanks can be subjected to integral type assembly in cabinet, realize and control multichannel power network to carry out reliably distribution operation operation simultaneously.
Description
Technical field
It is especially a kind of to be applied to three-phase alternating current 50Hz, rated voltage 12kV power trains the present invention relates to a kind of ring main unit
System, and for the compact type environment-protection gas inflated ring main unit of town and country all types of user transformation and distribution system.
Background technology
Currently, the ring main unit used in domestic and international power system is various in style, and majority is using sulfur hexafluoride gas as exhausted
Edge medium, sulfur hexafluoride gas are a kind of gas damaged to earth atmosphere, very not environmentally and cost is high,
Future will be eliminated.It is used to take up switchgear in ring main unit（Three station breakers and tri-station isolating switch）Gas tank body
Product is big, it is impossible to realizes modularization mounting design, and is difficult to extend, i.e., more set switchgears typically is installed on into a gas
In case, when switchgear is relatively more（More than 3 sets）When, not only switchgear installation difficulty, and be difficult to ensure that the airtight of gas tank
Property and overall mechanical strength, also to ring main unit, carrying out multichannel power distribution brings detrimental effect simultaneously for this；At the same time, it is existing
For three station breakers mainly using the conceptual design as described in Patent No. ZL201620259166.X, this breaker could not be right
Entry/exit line pole per the upper and lower side of phase pole accomplishes preferable split-phase isolation, also could not be to division is conducted and carried out as electric power
The interlinked mechanism of lock action accomplishes preferable split-phase isolation, so that the volume of the breaker is bigger, wherein phase spacing is protected
Hold in 165mm（The phase spacing of conventional air insulation breaker is maintained at 210mm）, and then in order to keep safe distribution of electric power, and it is necessary
Correspondingly increase the volume of gas tank.
In summary, in the case where current environmental regulation is increasingly tighter, use using environmentally friendly gas and be used as dielectric
Gas tank, while ensuring ring main unit while carrying out multichannel power distribution, and can reduces the volume of ring main unit as much as possible, and this is current
Urgent problem.
The content of the invention
Present invention aim to solve the above mentioned problem present in existing ring main unit, a kind of compact is provided for this
Environmentally friendly gas inflated ring main unit, this ring main unit small volume, compact-sized, cost is cheap, clean environment firendly, and can realize same
When controls the progress of Multi-path electricity net, and reliably distribution runs operation.
The present invention concrete scheme be：A kind of compact type environment-protection gas inflated ring main unit, there is cabinet, it is characterized in that：
Provided with closed gas tanks that several are arranged side by side in cabinet, three-phase is provided with each gas tank into and out of thread casing, gas tank built with
Three station breakers and tri-station isolating switch, and be equipped with front side of gas tank and keep apart respectively with three station breakers and three stations
Close the circuit breaker operation mechanism and isolator operating mechanism to match；Three station breakers include three-phase pole and interlock machine
Structure, interlinked mechanism are driven by circuit breaker operation mechanism, and dynamic and static contact connects in vacuum extinction room in realizing manipulation per phase pole
Touch with separating；Be respectively provided with per phase pole insulation booth for installing vacuum interrupter and it is corresponding with vacuum interrupter it is enterprising/
Outlet pole and lower entry/exit line pole, the upper end and front end of insulation booth are in uncovered structure, in the inner side of insulation booth upper/lower terminal
Creeping-increasing skirt is equipped with wall, the wherein creeping-increasing skirt of upper and lower ends is corresponding with upper and lower entry/exit line pole respectively, a left side for insulation booth,
Right side wall is provided with the wing edge for extending to its front side and isolating for realizing split-phase；Tri-station isolating switch includes mechanism box and rotation
The isolator operation axle being installed in mechanism box, three station conductive arms and three station wiring are housed on isolator operation axle
Contact, three station grounding contacts of corresponding three station conductive arms arrangement are provided with the inside of mechanism box, in isolator operation axle and
Three station conductive arms are coated with the insulating barrier of integral type；The three-phase entrance bushing connect respectively on three-phase pole it is enterprising/
Outlet pole, three station wiring contacts connect three-phase outlet casing tube respectively, the three-phase entrance bushing pair on adjacent two gas tanks
It should be connected.
The quantity of heretofore described gas tank is set to 1-4；Inflation inlet and pressure relief device are provided with gas tank, is filled in gas tank
Enter to have dry air or nitrogen；The protection class of gas tank is IP67；Each gas tank can spell along left and right sides spread, and with this
Dress is integrated.
Heretofore described interlinked mechanism includes a breaker operator axle and three groups corresponding with three-phase pole respectively
Swing arm, insulated tension pole, trace；Three swing arms are separately mounted on breaker operator axle, the swinging end of each swing arm and insulation
One end of pull bar is hinged, and the other end of insulated tension pole is hinged one end of trace, and it is solid to be rotatably installed in one in the middle part of trace
On dead axle, the other end of trace is used to control in vacuum extinction room contact of the moving contact with static contact with separating.
For the wing on front side of heretofore described insulation booth along being in single stepped construction, the lower end on wing edge will be with every phase for realization
The corresponding insulated tension pole of pole, trace carry out split-phase isolation；It is alternate between three-phase pole in the three stations breaker
Away from and tri-station isolating switch in phase spacing between three station conductive arms be 150mm.
The left and right lateral wall of heretofore described insulation booth is provided with the reinforcement arranged vertically.
The isolation channel isolated for realizing split-phase is equipped with the present invention on three-phase outlet casing tube, in the inner side of isolation channel
Wall is provided with creeping-increasing skirt；Outlet casing tube is set to separate structure or integral structure with isolation channel.
Heretofore described insulation booth uses epoxide resin material moulding by casting；The isolator operation axle and three stations
The insulation system of conductive arm outer layer is made of glass fiber reinforced polycarbonate material.
The present invention has advantages below：
(1) small volume of the present invention, compact-sized, cost is cheap, and it is assembled multiple gas tanks can be carried out into integral type in cabinet, are realized
Multichannel power network is controlled to carry out reliably distribution operation operation simultaneously；
(2) each gas tank uses environmentally friendly gas as dielectric in the present invention, and three station breakers and three works in gas tank
Position disconnecting switch is isolated using split-phase, so as to which phase spacing is decreased into 150mm, and then is ensuring three station breakers and three works
In the case that position disconnecting switch is normally carried out switch motion, the volume of gas tank is greatly reduced；
(3) present invention carries out split-phase isolating and protecting to the enter line side of three-phase entrance bushing and the outgoing line side of three-phase outlet casing tube,
And the tri-station isolating switch of the insulating barrier provided with glass fiber reinforced polycarbonate material is configured, looped network is ensure that on the whole
Cabinet distribution reliability of operation.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of the present invention；
Fig. 2 is that the mounting structure for two gas tanks for being mounted with three station breakers and tri-station isolating switch in the present invention respectively shows
It is intended to；
Fig. 3 is the backsight structural representation of the present invention；
Fig. 4 is the side structure schematic view of the present invention；
Fig. 5 is the dimensional structure diagram of three station breakers in the present invention；
Fig. 6 is the main structure diagram of three station breakers in the present invention；
Fig. 7 is the side structure schematic view of three station breakers in the present invention；
Fig. 8 is the dimensional structure diagram of tri-station isolating switch in the present invention；
Fig. 9 is tri-station isolating switch in the overlooking the structure diagram in ground state；
Figure 10 is tri-station isolating switch in the side structure schematic view in ground state.
In figure：1-cabinet, 2-gas tank, 2a-skeleton, 2b-sealing plate, 3-entrance bushing, 4-outlet casing tube, 5-
Three station breakers, 6-tri-station isolating switch, 7-circuit breaker operation mechanism, 8-isolator operating mechanism, 9-vacuum
Arc-chutes, 10-insulation booth, 11-enterprising/outlet pole, 12-lower entry/exit line pole, 13-creeping-increasing skirt, 14-wing edge,
15-mechanism box, 16-isolator operation axle, 17-conductive arm, 18-wiring contact, 19-grounding contact, 20-insulation
Layer, 21-branch bus, 22-main bus-bar, 23-pressure relief device, 24-breaker operator axle, 25-swing arm, 26-insulated tension pole,
27-trace, 28-fixing axle, 29-reinforcement, 30-isolation channel.
Embodiment
Referring to Fig. 1-10, a kind of compact type environment-protection gas inflated ring main unit, there is cabinet 1, two are provided with cabinet 1 simultaneously
The closed gas tank 2 that arrangement is put, is provided with three-phase entrance bushing 3 and three-phase outlet casing tube 4, gas tank 2 is built with three on each gas tank 2
Station breaker 5 and tri-station isolating switch 6, and be equipped with the front side of gas tank 2 and isolate respectively with three station breakers 5 and three stations
The circuit breaker operation mechanism 7 and isolator operating mechanism 8 that switch 6 matches；Three station breakers 5 include three-phase pole and company
Motivation structure, interlinked mechanism are driven by circuit breaker operation mechanism 7, and realize dynamic and static in vacuum interrupter 9 in the every phase pole of manipulation touch
The contact of head is with separating；Insulation booth 10 for installing vacuum interrupter 9 and relative with vacuum interrupter 9 is respectively provided with per phase pole
Enterprising/outlet the pole 11 and lower entry/exit line pole 12 answered, the upper end and front end of insulation booth 10 are in uncovered structure, in insulation booth
Be equipped with creeping-increasing skirt 13 on the madial wall of 10 upper/lower terminals, wherein the creeping-increasing skirt 13 of upper and lower ends respectively with upper and lower entry/exit line
Pole 11,12 is corresponding, and the left and right side wall of insulation booth 10 is provided with the wing edge for extending to its front side and isolating for realizing split-phase
14；Tri-station isolating switch 6 includes mechanism box 15 and is rotatablely installed in the isolator operation axle 16 in mechanism box 15, is isolating
Three station conductive arms 17 and three station wiring contacts 18 are housed on switching manipulation axle 16, corresponding three works are provided with the inner side of mechanism box 15
The three station grounding contacts 19 that position conductive arm 17 is arranged, one is coated with the station conductive arm 17 of isolator operation axle 16 and three
The insulating barrier 20 of body formula；The three-phase entrance bushing 3 connects enterprising/outlet pole 11 on three-phase pole respectively, and three stations connect
Line contact 19 connects three-phase outlet casing tube 4 by branch bus 21 respectively, and the three-phase entrance bushing 3 on adjacent two gas tanks 2 is logical
Cross main bus-bar 22 and correspond to and be connected
When tri-station isolating switch 6 is in "on" position, enter under three station conductive arms 17 correspondence and three station breakers 5/
Outlet pole 12 is connected；When tri-station isolating switch 6 is in gate-dividing state, three station conductive arms 17 are with isolator operation
Axle 16 rotates 45 ° and separated with the lower entry/exit line pole 12 of three station breakers 5, as shown in Figure 8；When tri-station isolating switch 6
During in ground state, three station conductive arms 17 touch as isolator operation axle 16 rotates 45 ° and is grounded with three stations again
First 19 are connected, referring to Fig. 9, Figure 10.
In the present embodiment, inflation inlet and pressure relief device 23 are provided with gas tank 2, dry air or nitrogen have been filled with gas tank 2
Gas or other feature of environmental protection gaseous state dielectrics；The protection class of gas tank 2 is IP67；Each gas tank 2 can freely expand along the left and right sides
Exhibition, and is integrated with this assembly, as shown in Fig. 2 skeleton 2a and the sealing plate that with skeleton 2a matches of the gas tank 2 by case structure
2b is welded by robot sealing and formed, and can carry out phase to skeleton structure according to the quantity of the gas tank 2 of actually required installation
Should ground extension.
Referring to Fig. 5, Fig. 6, Fig. 7, interlinked mechanism described in the present embodiment includes a component of breaker operator axle 24 and three
Not corresponding with three-phase pole swing arm 25, insulated tension pole 26, trace 27；Three swing arms 25 are separately mounted to breaker operator
On axle 24, one end of the swinging end and insulated tension pole 26 of each swing arm 25 is hinged, and the other end of insulated tension pole 26 is be hinged to be interlocked
One end of bar 27, the middle part of trace 27 are rotatably installed in a fixing axle 28, and the other end of trace 27 is used to control vacuum
Contact of the moving contact with static contact is with separating in arc-chutes 9.
Referring to Fig. 7, the wing on front side of insulation booth 10 described in the present embodiment is in single stepped construction along 14, lower end of the wing along 14
The insulated tension pole 26 corresponding with every phase pole, trace 27 are subjected to split-phase isolation for realizing；The three stations breaker 5
Phase spacing in phase spacing and tri-station isolating switch 6 between middle three-phase pole between three station conductive arms 17 is 150mm.
The left and right lateral wall of insulation booth 10 described in the present embodiment is provided with the reinforcement 29 arranged vertically.
The isolation channel 30 isolated for realizing split-phase is equipped with the present embodiment on three-phase outlet casing tube 4, in isolation channel
30 madial wall is provided with creeping-increasing skirt 13；Outlet casing tube 4 is set to separate structure or integral structure with isolation channel 30.
Insulation booth 10 described in the present embodiment uses epoxide resin material moulding by casting；The He of isolator operation axle 16
The insulating barrier 20 of the outer layer of three station conductive arm 17 is made of glass fiber reinforced polycarbonate material.
Claims (7)
1. a kind of compact type environment-protection gas inflated ring main unit, there is cabinet, it is characterized in that：Several are provided with cabinet and is arranged
The closed gas tank put, three-phase is provided with each gas tank into and out of thread casing, gas tank built with three station breakers and three stations every
Pass is left, and equipped with the breaker operator machine to match respectively with three station breakers and tri-station isolating switch on front side of gas tank
Structure and isolator operating mechanism；Three station breakers include three-phase pole and interlinked mechanism, and interlinked mechanism is by breaker operator
Mechanism drives, and realizes the contact of dynamic and static contact in vacuum extinction room in the every phase pole of manipulation with separating；It is respectively provided with per phase pole
For installing the insulation booth and the enterprising/outlet pole corresponding with vacuum interrupter and lower entry/exit line pole of vacuum interrupter,
The upper end and front end of insulation booth are in uncovered structure, and creeping-increasing skirt is equipped with the madial wall of insulation booth upper/lower terminal, wherein up and down
The creeping-increasing skirt at both ends is corresponding with upper and lower entry/exit line pole respectively, and the left and right side wall of insulation booth is provided with to its front side extension simultaneously
For realizing the wing edge of split-phase isolation；Tri-station isolating switch includes mechanism box and is rotatablely installed in the disconnecting switch in mechanism box
Operating shaft, three station conductive arms and three station wiring contacts are housed on isolator operation axle, on the inside of mechanism box be provided with pair
The three station grounding contacts for answering three station conductive arms to arrange, one is coated with isolator operation axle and three station conductive arms
The insulating barrier of formula；The three-phase entrance bushing connects enterprising/outlet pole on three-phase pole, three station wiring contacts point respectively
Not Lian Jie three-phase outlet casing tube, the three-phase entrance bushing on adjacent two gas tanks is correspondingly connected.
2. a kind of compact type environment-protection gas inflated ring main unit according to claim 1, it is characterized in that：The quantity of the gas tank
It is set to 1-4；Inflation inlet and pressure relief device are provided with gas tank, dry air or nitrogen have been filled with gas tank；The protection of gas tank
Grade is IP67；Each gas tank can be integrated along left and right sides spread, and with this assembly.
3. a kind of compact type environment-protection gas inflated ring main unit according to claim 1, it is characterized in that：The interlinked mechanism bag
Include a breaker operator axle and three groups swing arm corresponding with three-phase pole, insulated tension pole, trace respectively；Three swing arms point
An Zhuan not be on breaker operator axle, the swinging end of each swing arm and one end of insulated tension pole are hinged, insulated tension pole it is another
End is hinged one end of trace, is rotatably installed in the middle part of trace in a fixing axle, and the other end of trace is used to control very
Contact of the moving contact with static contact is with separating in empty arc-chutes.
4. a kind of compact type environment-protection gas inflated ring main unit according to claim 3, it is characterized in that：On front side of the insulation booth
The wing along be in single stepped construction, the lower end on wing edge is used for realization and enters the insulated tension pole corresponding with every phase pole, trace
Row split-phase is isolated；Three stations are conductive in phase spacing and tri-station isolating switch in the three stations breaker between three-phase pole
Phase spacing between arm is 150mm.
5. a kind of compact type environment-protection gas inflated ring main unit according to claim 1, it is characterized in that：The insulation booth
Left and right lateral wall is provided with the reinforcement arranged vertically.
6. a kind of compact type environment-protection gas inflated ring main unit according to claim 1, it is characterized in that：In three-phase outlet casing tube
On be equipped with for realize split-phase isolation isolation channel, creeping-increasing skirt is provided with the madial wall of isolation channel；Outlet casing tube is with isolating
Groove is set to separate structure or integral structure.
7. a kind of compact type environment-protection gas inflated ring main unit according to any one claim in claim 1 to 6, its
It is characterized in：The insulation booth uses epoxide resin material moulding by casting；Outside the isolator operation axle and three station conductive arms
The insulation system of layer is made of glass fiber reinforced polycarbonate material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710877691.7A CN107404084A (en) | 2017-09-26 | 2017-09-26 | A kind of compact type environment-protection gas inflated ring main unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710877691.7A CN107404084A (en) | 2017-09-26 | 2017-09-26 | A kind of compact type environment-protection gas inflated ring main unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107404084A true CN107404084A (en) | 2017-11-28 |
Family
ID=60388739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710877691.7A Withdrawn CN107404084A (en) | 2017-09-26 | 2017-09-26 | A kind of compact type environment-protection gas inflated ring main unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107404084A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108134337A (en) * | 2017-12-27 | 2018-06-08 | 上海正昊电力科技有限公司 | Breaker module and the environmentally friendly gas-insulated ring network cabinet for including it |
| CN108270168A (en) * | 2017-12-28 | 2018-07-10 | 北京双杰电气股份有限公司 | A kind of aerated type switchgear |
| CN108847365A (en) * | 2018-08-07 | 2018-11-20 | 江苏森源电气股份有限公司 | Gas-filling cabinet vacuum circuit breaker special and three-station all-in-one machine |
| CN109412067A (en) * | 2018-11-02 | 2019-03-01 | 北京双杰电气股份有限公司 | Environmentally friendly gas insulation switch cabinet |
| CN109449816A (en) * | 2018-10-30 | 2019-03-08 | 深圳供电局有限公司 | Compact air insulation switchgear |
| CN109698089A (en) * | 2019-01-28 | 2019-04-30 | 广东安恒铁塔钢构有限公司 | A kind of tri-station isolating switch and atmospheric closed permanent-magnet breaker cabinet |
| CN111653944A (en) * | 2020-06-12 | 2020-09-11 | 上海电气集团股份有限公司 | Low-voltage inflating cabinet |
| CN112018652A (en) * | 2020-08-26 | 2020-12-01 | 西安神电(泾阳)电器有限公司 | Environment-friendly inflatable switch cabinet |
| WO2021000660A1 (en) * | 2019-07-03 | 2021-01-07 | 赫兹曼电力（广东）有限公司 | Compact and small normal-pressure sealed air-insulated switch cabinet |
| CN113328344A (en) * | 2021-05-18 | 2021-08-31 | 淮南万泰电气有限公司 | Totally-enclosed all-insulation inflatable ring main unit locking structure |
| CN114976982A (en) * | 2022-04-25 | 2022-08-30 | 北京清畅电力技术股份有限公司 | Multi-functional two isolator equipment of environmental protection gas insulation |
| CN115566569A (en) * | 2022-11-09 | 2023-01-03 | 黄华集团有限公司 | Environment-friendly gas insulation switch cabinet |
| CN116154666A (en) * | 2023-02-07 | 2023-05-23 | 申恒电力设备有限公司 | Upper isolation upper grounding environment-friendly gas-insulated ring main unit |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108134337A (en) * | 2017-12-27 | 2018-06-08 | 上海正昊电力科技有限公司 | Breaker module and the environmentally friendly gas-insulated ring network cabinet for including it |
| CN108270168A (en) * | 2017-12-28 | 2018-07-10 | 北京双杰电气股份有限公司 | A kind of aerated type switchgear |
| CN108847365A (en) * | 2018-08-07 | 2018-11-20 | 江苏森源电气股份有限公司 | Gas-filling cabinet vacuum circuit breaker special and three-station all-in-one machine |
| CN109449816A (en) * | 2018-10-30 | 2019-03-08 | 深圳供电局有限公司 | Compact air insulation switchgear |
| CN109412067A (en) * | 2018-11-02 | 2019-03-01 | 北京双杰电气股份有限公司 | Environmentally friendly gas insulation switch cabinet |
| CN109698089A (en) * | 2019-01-28 | 2019-04-30 | 广东安恒铁塔钢构有限公司 | A kind of tri-station isolating switch and atmospheric closed permanent-magnet breaker cabinet |
| WO2021000660A1 (en) * | 2019-07-03 | 2021-01-07 | 赫兹曼电力（广东）有限公司 | Compact and small normal-pressure sealed air-insulated switch cabinet |
| CN111653944A (en) * | 2020-06-12 | 2020-09-11 | 上海电气集团股份有限公司 | Low-voltage inflating cabinet |
| CN112018652A (en) * | 2020-08-26 | 2020-12-01 | 西安神电(泾阳)电器有限公司 | Environment-friendly inflatable switch cabinet |
| CN113328344A (en) * | 2021-05-18 | 2021-08-31 | 淮南万泰电气有限公司 | Totally-enclosed all-insulation inflatable ring main unit locking structure |
| CN114976982A (en) * | 2022-04-25 | 2022-08-30 | 北京清畅电力技术股份有限公司 | Multi-functional two isolator equipment of environmental protection gas insulation |
| CN114976982B (en) * | 2022-04-25 | 2023-01-10 | 北京清畅电力技术股份有限公司 | Multi-functional two isolator equipment of environmental protection gas insulation |
| CN115566569A (en) * | 2022-11-09 | 2023-01-03 | 黄华集团有限公司 | Environment-friendly gas insulation switch cabinet |
| CN115566569B (en) * | 2022-11-09 | 2023-06-06 | 黄华集团有限公司 | Environment-friendly gas-insulated switchgear |
| CN116154666A (en) * | 2023-02-07 | 2023-05-23 | 申恒电力设备有限公司 | Upper isolation upper grounding environment-friendly gas-insulated ring main unit |
| CN116154666B (en) * | 2023-02-07 | 2023-09-01 | 申恒电力设备有限公司 | Upper isolation upper grounding environment-friendly gas-insulated ring main unit |
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Application publication date: 20171128 |