CN114256024A - Atmospheric pressure sealed air-insulated circuit breaker switch - Google Patents
Atmospheric pressure sealed air-insulated circuit breaker switch Download PDFInfo
- Publication number
- CN114256024A CN114256024A CN202111384696.9A CN202111384696A CN114256024A CN 114256024 A CN114256024 A CN 114256024A CN 202111384696 A CN202111384696 A CN 202111384696A CN 114256024 A CN114256024 A CN 114256024A
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- China
- Prior art keywords
- circuit breaker
- switch
- sealed air
- contact
- insulated circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 230000003068 static effect Effects 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 9
- 239000012212 insulator Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 27
- 238000012423 maintenance Methods 0.000 abstract description 13
- 238000007789 sealing Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/003—Earthing switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
- H01H33/6661—Combination with other type of switch, e.g. for load break switches
Landscapes
- Gas-Insulated Switchgears (AREA)
Abstract
The invention discloses a normal-pressure sealed air insulation circuit breaker switch, and relates to a high-voltage electrical switch. The normal-pressure sealed air insulated circuit breaker switch is stable in use, safe, environment-friendly, long in service life and low in maintenance cost. The atmospheric-pressure sealed air-insulated circuit breaker switch comprises a mechanism box, wherein a transmission main shaft is arranged in the mechanism box, a transmission crank arm is arranged on the transmission main shaft, an arc-shaped groove is formed in the transmission crank arm, a crank arm roller is arranged in the arc-shaped groove, and the crank arm roller is fixedly connected with a pull rod shaft; the vacuum circuit breaker comprises a vacuum arc extinguish chamber, a movable conducting rod of the vacuum arc extinguish chamber is connected with a pull rod shaft, and a static end of the vacuum arc extinguish chamber is connected with an external contact; the isolating/grounding switch comprises a switch main shaft and a grounding contact, the grounding contact is connected with a selective conductive rod, a switch crank arm is connected to the switch main shaft, a connecting rod is connected to the switch crank arm, the connecting rod is movably connected with the selective conductive rod, and the movable end of the selective conductive rod can be in contact with the grounding contact or an external contact.
Description
Technical Field
The invention relates to the technical field of high-voltage electrical switches, in particular to a normal-pressure sealed air-insulated circuit breaker switch.
Background
The traditional high-voltage switch cabinet is complex and complicated in maintenance and management. The volume of the cabinet is large, and the cabinet body is of a non-sealed structure and can be threatened by external pollutants, dust and acid mist all the time. Therefore, in order to ensure the service life thereof, strict inspection, maintenance, and repair are required at regular intervals. For some gas insulated cabinets such as SF6, pressure detection is required to be performed regularly to prevent insulating gas leakage and cause safety accidents such as insulation failure.
The advantage of the atmospheric pressure sealed air insulated circuit breaker switch is its maintenance free nature. The switch adopts a normal-pressure sealed box structure, has no threat of gas leakage, can effectively isolate the pollution of external filth, dust and acid mist, ensures the cleanness and the service life of the operating environment of the busbar, the circuit breaker, the isolation knife and the grounding knife, realizes the purpose of maintenance free, and greatly reduces the investment of distribution network operation and maintenance management.
When the conventional open-type switch cabinet and the handcart-type switch cabinet are subjected to regular power failure maintenance or accident emergency repair, if some errors of safety measures, unclear safety traffic, monitoring missing, illegal operation, locking failure and the like occur, the conventional open-type switch cabinet and the handcart-type switch cabinet are easily touched with electrified high-voltage equipment or electrified exposed busbars or even do not enter an electrified interval, so that a serious electric power safety accident is caused.
The design concept of the normal-pressure sealed air insulation circuit breaker switch can effectively avoid the situations. Firstly, the maintenance-free design concept is adopted, so that the possibility of electric shock in the process of cleaning the switch cabinet can be avoided. In addition, due to the design of the normal-pressure sealing box body structure, maintenance and management personnel cannot touch the high-voltage charged part in the switch sealing box body, and the life safety of the maintenance and management personnel is guaranteed.
With the continuous update of distribution network switch equipment, another problem, namely the problem of environmental pollution, is caused. In the recovery process of the high-voltage SF6 switch cabinet, greenhouse gases can be leaked possibly, and negative effects on the environment are caused; the high-voltage solid switch cabinet may generate a large amount of epoxy resin, and become "stubborn" garbage which cannot be degraded.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a normal-pressure sealed air insulated circuit breaker switch which is stable in use, safe, environment-friendly, long in service life and low in maintenance cost.
The normal pressure sealing air insulation breaker switch can effectively isolate a power supply particularly in the voltage class with the rated voltage of 10kV in the power transmission and distribution link, and can pass normal working current and short-circuit current under faults in the closed state.
The invention relates to a normal pressure sealing air insulation breaker switch, which comprises a mechanism box, a vacuum breaker and an isolation/grounding switch,
a circuit breaker transmission mechanism is arranged in the mechanism box and comprises a transmission main shaft, a transmission crank arm is fixedly arranged on the transmission main shaft, an arc-shaped groove is formed in the transmission crank arm, a crank arm roller is arranged in the arc-shaped groove, and the crank arm roller is fixedly connected with a pull rod shaft;
the vacuum circuit breaker comprises a vacuum arc extinguish chamber, an inner moving contact of the vacuum arc extinguish chamber is fixed on a moving conducting rod, the moving conducting rod is fixedly connected with a pull rod shaft through an insulating pull rod, and a static end of the vacuum arc extinguish chamber is connected with an external contact;
the isolating/grounding switch comprises a switch main shaft, an outer fixed contact and a grounding contact, wherein one end of the grounding contact is movably connected with a selective conductive rod, a switch connecting lever is fixedly connected to the switch main shaft and movably connected with a connecting rod, the connecting rod is movably connected with the selective conductive rod, and the movable end of the selective conductive rod can be in contact with the grounding contact or the outer contact.
The invention relates to a normal-pressure sealed air-insulated circuit breaker switch, wherein a support frame is arranged on a shell of a circuit breaker transmission mechanism, and a transmission main shaft is movably arranged on the support frame.
The invention relates to a normal-pressure sealed air insulation circuit breaker switch, wherein a shell of a vacuum arc extinguish chamber comprises an insulation cylinder, metal cover plates at two ends and a corrugated pipe, and the corrugated pipe is positioned in a space enclosed by the insulation cylinder and the metal cover plates.
The invention relates to a normal pressure sealing air insulation breaker switch, wherein a movable conducting rod penetrates through a corrugated pipe and is welded with one port of the corrugated pipe, the other port of the corrugated pipe is welded with a middle hole of a metal cover plate, and the movable conducting rod penetrates out of the middle hole.
The invention relates to a normal-pressure sealed air insulation circuit breaker switch, wherein a flexible connection structure is arranged on a movable conducting rod.
The invention relates to a normal-pressure sealed air-insulated circuit breaker switch, wherein an isolation/grounding switch comprises a switch bracket, an insulator is arranged on the switch bracket, and an external static contact is arranged on the insulator; the switch main shaft is arranged on the switch bracket.
The invention relates to a normal pressure sealed air insulation breaker switch, wherein the upper part and the lower part of a vacuum arc extinguish chamber are respectively provided with an upper insulation plate and a lower insulation plate.
The invention relates to a normal-pressure sealed air insulation breaker switch, wherein an upper upright post is arranged above an upper insulation plate, and the upper part of the upper upright post is fixedly connected with a bottom steel plate of a shell of a breaker transmission mechanism.
The invention relates to a normal pressure sealing air insulation breaker switch, wherein a lower upright post is arranged between an upper insulation plate and a lower insulation plate.
The invention relates to a normal pressure sealing air insulation breaker switch, wherein an external contact is fixed on a lower insulation plate.
The normal-pressure sealed air-insulated circuit breaker switch is different from the prior art in that the vacuum circuit breaker is arranged for vacuum arc extinguishing, no SF6 greenhouse gas is generated, the breaking failure caused by the reduction of insulation and arc extinguishing capacity due to the leakage of SF6 is avoided, no epoxy resin is generated, the switch is safe and environment-friendly, and energy conservation and emission reduction are realized; the isolation/grounding switch provided by the invention is matched with an external contact of the vacuum circuit breaker to realize a three-station isolation/grounding switch structure, and the isolation/grounding state is visible; the invention adopts the air insulation structure design with self-healing capability in the structure, uses the vacuum arc-extinguishing chamber, and uses air as the insulation medium, thereby being not easy to damage and having lower maintenance cost.
The atmospheric pressure sealed air insulated circuit breaker switch of the present invention will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a normal pressure sealed air insulated circuit breaker switch according to the present invention;
the notation in the figures means: 10-a mechanism box; 11-a housing; 12-a drive spindle; 13-a transmission crank arm; 14-a support frame; 15-crank arm roller; 16-a drawbar shaft;
20-vacuum circuit breaker; 21-an insulating pull rod; 22-upper upright column; 23-a flexible connection structure; 24-an upper insulating plate; 25-lower upright; 26-a vacuum arc-extinguishing chamber; 27-a lower insulating plate; 28-an external contact;
30-isolation/grounding switch; 31-switching the main shaft; 32-switch crank arm; 33-a connecting rod; 34-a switch bracket; 35-selecting a conductive rod; 36-a ground contact; 37-an outer stationary contact; 38-insulator.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the atmospheric hermetic air insulated circuit breaker switch of the present invention comprises a mechanism case 10, a vacuum circuit breaker 20 and an isolating/grounding switch 30, which are sequentially arranged from top to bottom.
The mechanism box 10 is internally provided with a circuit breaker transmission mechanism, and the circuit breaker transmission mechanism is used for transmitting the motion of the circuit breaker operation mechanism to the vacuum arc-extinguishing chamber 26, so as to realize the switching-on and switching-off operations of the vacuum arc-extinguishing chamber 26.
A supporting frame 14 is arranged on a shell 11 of the circuit breaker transmission mechanism. There may be a plurality of support frames 14, in this embodiment, there are three support frames 14, and the transmission main shaft 12 is mounted on the three support frames 14. The transmission main shaft 12 is movably mounted on the supporting frame 14, and the transmission main shaft 12 can be driven to rotate by operating a power mechanism of the circuit breaker. The transmission main shaft 12 is fixedly provided with a transmission crank arm 13, and the transmission crank arm 13 can rotate along with the transmission main shaft 12. An arc groove is formed in the transmission crank arm 13, and a crank arm roller 15 is installed in the arc groove. The crank roller 15 is fixedly connected with the pull rod shaft 16.
When the transmission crank arm 13 rotates along with the transmission main shaft 12, the radius of the arc-shaped groove is constantly changed to drive the crank arm roller 15 and the pull rod shaft 16 to move up and down, so that the movable conducting rod of the vacuum arc-extinguishing chamber 26 is driven to move up and down, and the switching-on and switching-off operations of the vacuum arc-extinguishing chamber 26 are realized.
The vacuum circuit breaker 20 is located below the mechanism box 10, the vacuum circuit breaker 20 comprising a vacuum interrupter 26, the vacuum interrupter 26 being the most important component in the vacuum circuit breaker 20. The housing of the vacuum arc-extinguishing chamber 26 is a sealed container consisting of an insulating cylinder, metal cover plates at two ends and a corrugated pipe, and the corrugated pipe is positioned in a space enclosed by the insulating cylinder and the metal cover plates. A pair of contacts, namely an inner fixed contact and an inner movable contact, are arranged inside the vacuum arc-extinguishing chamber 26. The inner static contact is welded on the static conducting rod, and the inner moving contact is welded on the moving conducting rod. The movable conducting rod penetrates through the corrugated pipe and is welded with one port of the corrugated pipe, the other port of the corrugated pipe is welded with the middle hole of the metal cover plate, and the movable conducting rod penetrates out of the middle hole and is connected to the insulating pull rod 21. The insulating pull rod 21 is fixedly connected with a pull rod shaft 16 of the transmission mechanism of the circuit breaker and can reciprocate along with the pull rod shaft 16. Because the corrugated pipe can freely stretch out and draw back in the axial direction, the structure can drive the inner moving contact to move in the vacuum arc-extinguishing chamber 26 in an opening and closing mode, and the sealing performance of the shell of the vacuum arc-extinguishing chamber 26 can be guaranteed.
Upper and lower portions of the vacuum interrupter 26 are mounted with an upper insulating plate 24 and a lower insulating plate 27, respectively. Four upper upright posts 22 are arranged above the upper insulating plate 24, and the upper parts of the upper upright posts 22 are fixedly connected with a bottom steel plate of the shell 11 of the circuit breaker transmission mechanism. The upper upright post 22 plays a role in fixing and guiding the movable conducting rod. Four lower columns 25 are installed between the upper insulating plate 24 and the lower insulating plate 27, and the lower columns 25 are used for fixing the vacuum arc-extinguishing chambers 26.
The vacuum interrupter 26 is connected at its stationary end to an external contact 28, and the external contact 28 is fixed to a lower insulating plate 27.
And a flexible connecting structure 23 is arranged on the movable conducting rod, and the flexible connecting structure 23 is used for connecting the air box wire inlet and outlet sleeve.
Air is a natural insulating medium, and the vacuum circuit breaker 20 is a circuit breaker using air as an insulating medium and an arc extinguishing medium, and the combination of the two can form an air insulating structure with a self-healing capability. The vacuum circuit breaker 20 has good arc extinguishing characteristics, is suitable for frequent operation, and has the advantages of long electrical service life, high running reliability, no maintenance, long period and the like.
The isolating/grounding switch 30 includes a switch bracket 34, and the switch bracket 34 is a support for the isolating/grounding switch 30. An insulator 38 and a grounding contact 36 are mounted on the switch bracket 34, and an external stationary contact 37 is mounted at one end of the insulator 38. The outer static contact 37 and the grounding contact 36 are oppositely arranged, a selection conducting rod 35 is arranged between the outer static contact 37 and the grounding contact 36, and one end of the selection conducting rod 35 is hinged with the grounding contact 36. The switch main shaft 31 is installed on the switch support 34, one end of the switch main shaft 31 extends out of the switch support 34 and is connected with the operating mechanism through the leading-out shaft assembly, and the operating mechanism can drive the switch main shaft 31 to rotate. The switch spindle 31 is fixedly connected with a switch crank arm 32, the switch crank arm 32 is movably connected with a connecting rod 33, and the connecting rod 33 is movably connected with a selection conducting rod 35. The isolating mechanism is operated to drive the switch main shaft 31 to rotate, the switch crank arm 32 fixed on the switch main shaft 31 drives the connecting rod 33 to rotate, so that the selection conducting rod 35 at the other end of the connecting rod 33 is driven to rotate, the selection conducting rod 35 rotates by taking an external static contact 37 as a fulcrum, and the movable end of the selection conducting rod 35 can be in contact with the external contact 28 or the grounding contact 36. When the selection conducting rod 35 rotates to the position of the grounding contact 36, the grounding switch is switched on; when the selection conducting rod 35 rotates to the position of the external contact 28, the isolating switch is switched on; when the selection conductor bar 35 is rotated to the intermediate position between the ground contact 36 and the outer contact 28, the open state is established. By selecting the shifting of the conducting rod 35, the functions of separating and engaging, separating and grounding three positions are realized.
According to the normal-pressure sealed air-insulated circuit breaker switch, the vacuum circuit breaker is arranged for vacuum arc extinguishing, no SF6 greenhouse gas is generated, the breaking failure caused by the weakening of insulation and arc extinguishing capacity due to SF6 leakage is avoided, no epoxy resin is generated, and the normal-pressure sealed air-insulated circuit breaker switch is safe, environment-friendly, energy-saving and emission-reducing; the isolation/grounding switch provided by the invention is matched with an external contact of the vacuum circuit breaker to realize a three-station isolation/grounding switch structure, and the isolation/grounding state is visible; the invention adopts the air insulation structure design with self-healing capability in the structure, uses the vacuum arc-extinguishing chamber, and uses air as the insulation medium, thereby being not easy to damage and having lower maintenance cost.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111384696.9A CN114256024A (en) | 2021-11-22 | 2021-11-22 | Atmospheric pressure sealed air-insulated circuit breaker switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111384696.9A CN114256024A (en) | 2021-11-22 | 2021-11-22 | Atmospheric pressure sealed air-insulated circuit breaker switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114256024A true CN114256024A (en) | 2022-03-29 |
Family
ID=80792847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111384696.9A Pending CN114256024A (en) | 2021-11-22 | 2021-11-22 | Atmospheric pressure sealed air-insulated circuit breaker switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114256024A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115223819A (en) * | 2022-07-05 | 2022-10-21 | 浙江南洋输配电设备有限公司 | Vacuum circuit breaker with disconnector |
| CN115831660A (en) * | 2022-12-21 | 2023-03-21 | 珠海康晋电气股份有限公司 | Isolating switch with grounded arc extinguish chamber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2575835Y (en) * | 2002-10-08 | 2003-09-24 | 李彤 | Lampwick integrated forming machine |
| CN204242927U (en) * | 2014-10-22 | 2015-04-01 | 河南省三禾电气有限公司 | An outdoor vacuum permanent magnet vacuum circuit breaker |
| CN106356241A (en) * | 2016-11-15 | 2017-01-25 | 通用森源（深圳）电气有限公司 | High-stability high-pressure vacuum circuit breaker |
| CN207474365U (en) * | 2017-11-15 | 2018-06-08 | 浙江联格电气科技有限公司 | A kind of inflating cabinet breaker |
| CN207852569U (en) * | 2017-12-25 | 2018-09-11 | 江苏宏达电气有限公司 | A kind of integral vacuum Switch Insulation Cylinder |
| CN112382526A (en) * | 2020-10-22 | 2021-02-19 | 北京龙源开关设备有限责任公司 | Three station isolator integration circuit breakers on environment-friendly |
| CN112886462A (en) * | 2021-03-16 | 2021-06-01 | 吉林省金冠电气股份有限公司 | Environment-friendly gas insulated switch |
-
2021
- 2021-11-22 CN CN202111384696.9A patent/CN114256024A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2575835Y (en) * | 2002-10-08 | 2003-09-24 | 李彤 | Lampwick integrated forming machine |
| CN204242927U (en) * | 2014-10-22 | 2015-04-01 | 河南省三禾电气有限公司 | An outdoor vacuum permanent magnet vacuum circuit breaker |
| CN106356241A (en) * | 2016-11-15 | 2017-01-25 | 通用森源（深圳）电气有限公司 | High-stability high-pressure vacuum circuit breaker |
| CN207474365U (en) * | 2017-11-15 | 2018-06-08 | 浙江联格电气科技有限公司 | A kind of inflating cabinet breaker |
| CN207852569U (en) * | 2017-12-25 | 2018-09-11 | 江苏宏达电气有限公司 | A kind of integral vacuum Switch Insulation Cylinder |
| CN112382526A (en) * | 2020-10-22 | 2021-02-19 | 北京龙源开关设备有限责任公司 | Three station isolator integration circuit breakers on environment-friendly |
| CN112886462A (en) * | 2021-03-16 | 2021-06-01 | 吉林省金冠电气股份有限公司 | Environment-friendly gas insulated switch |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115223819A (en) * | 2022-07-05 | 2022-10-21 | 浙江南洋输配电设备有限公司 | Vacuum circuit breaker with disconnector |
| CN115831660A (en) * | 2022-12-21 | 2023-03-21 | 珠海康晋电气股份有限公司 | Isolating switch with grounded arc extinguish chamber |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220329 |
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| RJ01 | Rejection of invention patent application after publication |