CN109712842B - Built-in isolated vacuum arc-extinguishing chamber combination and vacuum circuit breaker - Google Patents
Built-in isolated vacuum arc-extinguishing chamber combination and vacuum circuit breaker Download PDFInfo
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- CN109712842B CN109712842B CN201910122339.1A CN201910122339A CN109712842B CN 109712842 B CN109712842 B CN 109712842B CN 201910122339 A CN201910122339 A CN 201910122339A CN 109712842 B CN109712842 B CN 109712842B
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- 238000002955 isolation Methods 0.000 claims abstract description 50
- 230000009471 action Effects 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 33
- 230000003068 static effect Effects 0.000 claims description 8
- 230000003111 delayed effect Effects 0.000 claims 1
- 230000035772 mutation Effects 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention discloses a built-in isolated vacuum arc-extinguishing chamber combination, which comprises a vacuum arc-extinguishing chamber and is characterized in that: the device also comprises an isolation assembly, a linkage assembly and a pull rod assembly; the vacuum arc-extinguishing chamber is connected with the isolation assembly in series, and the pull rod assembly is connected with the operating mechanism; the pull rod assembly acts, and the vacuum arc-extinguishing chamber and the isolation assembly are driven to act sequentially through the linkage assembly; when the vacuum arc extinguishing chamber is opened, the vacuum arc extinguishing chamber firstly performs opening action, and the isolation assembly is then opened; when the switch-on is performed, the isolation assembly performs switch-on action firstly, and performs switch-on action after the vacuum arc extinguishing chamber. Has the advantages of compact structure, convenient operation, safety and reliability.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution, in particular to an on-column vacuum circuit breaker.
Background
In order to improve the reliability of power supply of a distribution network and strengthen the safety management of the distribution network, the national power grid company starts to strongly promote a secondary integration project of power distribution equipment in 2016. Wherein the column vacuum circuit breaker is the main device in the primary circuit. However, the breaking distance of the vacuum arc extinguishing chamber is generally only 8 to 10 mm, the breaking distance is smaller, and when high overvoltage is generated on a power supply line or lightning and other impacts are generated on the power supply line in a breaking state, the vacuum breaking is likely to break down, so that the other side of the switch is electrified again, and accidents are caused. On the main road, this unreliable isolation is more evident and the threat is greater. Therefore, the column vacuum circuit breaker of the national power grid for line segmentation and connection points must be matched with an isolation disconnecting link, and the matched isolation disconnecting link should meet the hot standby requirement in the electric switching operation. However, most of the main-stream vacuum circuit breakers on the column in the market at present are external isolating blades. The external isolating knife needs to be operated independently, an interlocking device of the external isolating knife and the circuit breaker is additionally arranged, meanwhile, the external isolating knife is greatly influenced by the external environment, and the contact knife is easily oxidized, so that hidden troubles such as contact resistance increase and heating are caused.
Therefore, how to improve the existing vacuum circuit breaker on the column, especially the vacuum interrupter part, so as to overcome the above-mentioned disadvantages is a problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention aims to provide a vacuum arc-extinguishing chamber combination with a built-in isolation, which is compact in structure, convenient to operate, safe and reliable.
Another object of the present invention is to provide a vacuum circuit breaker having the built-in isolated vacuum interrupter assembly.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a built-in isolated vacuum interrupter combination, includes vacuum interrupter, its characterized in that: the device also comprises an isolation assembly, a linkage assembly and a pull rod assembly; the vacuum arc-extinguishing chamber is connected with the isolation assembly in series, and the pull rod assembly is connected with the operating mechanism;
the pull rod assembly acts, and the vacuum arc-extinguishing chamber and the isolation assembly are driven to act respectively through the linkage assembly; when the vacuum arc extinguishing chamber is opened, the vacuum arc extinguishing chamber firstly performs opening action, and the isolation assembly is then opened; when the switch-on is performed, the isolation assembly performs switch-on action firstly, and performs switch-on action after the vacuum arc extinguishing chamber.
Specifically, the vacuum arc-extinguishing chamber comprises an arc-extinguishing chamber fixed contact and an arc-extinguishing chamber movable contact, the isolation assembly comprises an isolation blade, an isolation fixed contact and a conductive block, and the linkage assembly comprises a bracket, a transmission block, a guide shaft, a first connecting rod and a second connecting rod;
the support is fixedly arranged, and a limit groove and a guide groove are formed in the support; the transmission block is fixedly arranged on the conductive block, the transmission block can slide along the limiting groove, and when the transmission block slides in the limiting groove, the moving contact of the arc-extinguishing chamber can be contacted with or separated from the fixed contact of the arc-extinguishing chamber; the conducting block is fixedly arranged, the conducting block is electrically connected with the moving contact of the arc extinguish chamber, the rear end of the isolating knife board is rotationally arranged on the conducting block, the isolating static contact is fixedly arranged, and when the isolating knife board rotates on the conducting block, the front end of the isolating knife board can be contacted with or separated from the isolating static contact; the guide shaft is rotatably arranged at the lower end of the pull rod assembly, and can slide along the guide groove; one end of the first connecting rod is rotatably arranged on the guide shaft, and the other end of the first connecting rod is rotatably arranged on the transmission block; one end of the second connecting rod is rotatably arranged on the guide shaft, and the other end of the second connecting rod is rotatably arranged at the middle section of the isolating knife board;
the pull rod assembly drives the guide shaft to slide in the guide groove, the guide shaft drives the transmission block to slide in the limit groove through the first connecting rod, and the guide shaft drives the isolation knife board to rotate on the conductive block through the second connecting rod, so that the vacuum arc-extinguishing chamber and the isolation assembly are switched on and off successively.
Preferably, the limit groove is of a transverse linear structure, the guide groove is of a curved knife type structure, and the guide groove comprises a delay section and a pushing section; when the guide shaft slides in the delay section, the transmission block is always positioned at the right end of the limiting groove, and when the guide shaft slides in the pushing section, the transmission block slides in the limiting groove. The limiting groove and the guide groove are arranged to be of a structure capable of achieving the function of switching on and off successively.
Further preferably, the pushing section is arranged obliquely downwards, and the lower end of the pushing section is close to the limiting groove. The pushing section is obliquely arranged downwards to be close to the limiting groove, and according to the lever principle, under the condition that the operation work of the pull rod assembly is certain, the transmission block can obtain larger speed, namely larger closing work can be obtained, so that closing is quicker, and the normal closing action of the circuit breaker is ensured.
As an improvement, the vacuum arc-extinguishing chamber combination is externally and fixedly provided with an insulating cover. The arrangement of the insulating cover enables the combination to be better in insulativity.
A vacuum circuit breaker comprises the built-in isolated vacuum arc-extinguishing chamber combination.
Compared with the prior art, the invention has the advantages that:
1. through the combination setting of vacuum interrupter and isolation component, on the one hand vacuum interrupter can realize breaking the large capacity of circuit, and on the other hand isolation component can realize the safety isolation to electrified circuit.
2. Through being in the same place isolation component and vacuum interrupter integration for this scheme compact structure need not interlock, makes product simple structure reliable.
3. This scheme is installed isolation subassembly inside the circuit breaker, protection isolation subassembly that can be better avoids it to receive external environment influence and take place to damage.
4. More important is: when the scheme is used for switching off, the vacuum arc-extinguishing chamber is firstly disconnected, and the isolation knife plate starts to be separated from the isolation static contact until the isolation assembly is completely switched off after the vacuum arc-extinguishing chamber is switched off in place; when the switch-on is performed, the isolation assembly is switched on first, and when the isolation cutting board contacts with the isolation static contact, the vacuum arc-extinguishing chamber starts to switch on. The working mode can ensure that the isolation assembly can not be electrified to be switched on or off, and ensure the safety and the reliability of the vacuum circuit breaker.
5. It is also worth mentioning that the isolating blade in the circuit breaker is mostly made of red copper, and the red copper has good conductivity, but has lower strength and is easy to deform and wear. The isolating knife board in the scheme is mainly used as a conductive part, the linkage assembly is mainly used as a structural part, the force from the pull rod assembly, received on the isolating knife board, is limited, and most of the force is born by the linkage assembly, so that the structure of the scheme is relatively firm and reliable, and the structure has longer service life.
Drawings
Fig. 1 is a schematic perspective view (insulation cover is not shown) of a preferred embodiment according to the present invention;
fig. 2 is a schematic perspective view of a preferred embodiment of the present invention (insulating cover and bracket are not shown);
FIG. 3 is a top view of a preferred embodiment according to the present invention;
fig. 4 to 6 are half sectional views of a preferred embodiment according to the present invention; wherein fig. 4 shows a closing state, fig. 6 shows a breaking state, and fig. 5 shows a closing-breaking or breaking-closing intermediate state;
FIG. 7 is a schematic view of the structure of a bracket in accordance with a preferred embodiment of the present invention;
FIG. 8 is a schematic perspective view of a drive block in accordance with a preferred embodiment of the present invention;
fig. 9 is a schematic perspective view of a conductive block according to a preferred embodiment of the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
In the description of the present invention, it should be noted that, for the azimuth words such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present invention that the device or element referred to must have a specific azimuth configuration and operation.
As shown in fig. 1 to 9, a preferred embodiment of the present invention includes a vacuum interrupter 1, an isolating assembly 2, a linkage assembly 3, a pull rod assembly 4, and an insulating cover 5. The vacuum arc-extinguishing chamber 1 and the isolation assembly 2 are connected in series, the pull rod assembly 4 is connected with the operating mechanism, and the insulating cover 5 is fixedly arranged outside.
The vacuum arc-extinguishing chamber 1 comprises an arc-extinguishing chamber fixed contact 11 and an arc-extinguishing chamber movable contact 12, the isolation assembly 2 comprises an isolation blade 21, an isolation fixed contact 22 and a conductive block 23, and the linkage assembly 3 comprises a bracket 31, a transmission block 32, a guide shaft 33, a first connecting rod 34 and a second connecting rod 35.
The concrete structure and the connection relation are as follows: the bracket 31 is fixedly arranged, and a limit groove 311 and a guide groove 312 are formed in the bracket 31; the transmission block 32 is fixedly arranged on the conductive block 23, the transmission block 32 can slide along the limiting groove 311, and when the transmission block 32 slides in the limiting groove 311, the moving contact 12 of the arc extinguishing chamber can be contacted with or separated from the fixed contact 11 of the arc extinguishing chamber; the conductive block 23 is fixedly connected with the moving contact 12 of the arc extinguishing chamber, the rear end of the isolating blade 21 is rotatably arranged on the conductive block 23, the isolating static contact 22 is fixedly arranged, and when the isolating blade 21 rotates on the conductive block 23, the front end of the isolating blade 21 can be contacted with or separated from the isolating static contact 22; the guide shaft 33 is rotatably arranged at the lower end of the pull rod assembly 4, and the guide shaft 33 can slide along the guide groove 312; one end of a first connecting rod 34 is rotatably arranged on the guide shaft 33, and the other end of the first connecting rod 34 is rotatably arranged on the transmission block 32; one end of the second connecting rod 35 is rotatably arranged on the guide shaft 33, and the other end of the second connecting rod 35 is rotatably arranged at the middle section of the isolation blade 31.
As an embodiment, the limiting groove 311 is in a transverse linear structure, the guiding groove 312 is in a curved knife structure, and the guiding groove 312 comprises a delay section 3121 and a pushing section 3122; when the guide shaft 33 slides on the delay section 3121, the transmission block 32 is always positioned at the right end of the limit groove 311, and when the guide shaft 33 slides on the push section 3122, the transmission block 32 slides in the limit groove 311. The pushing section 3122 is disposed obliquely downward, and the lower end of the pushing section 3122 is close to the limiting groove 311. As shown in fig. 7, it can be seen that the delay period 3121 is actually an arc segment, the limiting slot 311 is a waist-shaped slot, the center of the delay period 3121 is located at the center of the right end of the limiting slot 311, and the arc a shows the arc structure of the delay period 3121; while the push section 3122 is a sloped straight section, line B shows the straight configuration of the push section 3122; the delay section 3121 and the push section 3122 adopt arc corner transition. The above structure can ensure that the guide shaft 33 moves horizontally in the guide groove 312 and has a delay effect.
The working point of the embodiment is that the pull rod assembly 4 acts, and the vacuum arc extinguishing chamber 1 and the isolation assembly 2 are driven to act respectively through the linkage assembly 3; when the vacuum arc extinguishing chamber is opened, the vacuum arc extinguishing chamber 1 firstly performs opening action, and the isolation assembly 2 performs opening action; when in closing, the isolation assembly 2 performs closing action firstly, and the vacuum arc extinguishing chamber 1 performs closing action afterwards. ( The pull rod assembly 4 comprises a crank arm and a pull rod, a hexagonal hole of the crank arm is fixedly connected to an output shaft of the operating mechanism, the small end of the crank arm is rotationally connected with the pull rod, and the operating mechanism drives the crank arm to rotate; when the crank arm rotates anticlockwise, the pull rod assembly 4 pulls upwards to perform brake separating action; when the crank arm rotates clockwise, the pull rod assembly 4 pushes downwards to perform closing action. Since the pull rod assembly is of an existing structure, the operation of the pull rod assembly 4 will not be described in detail. )
Specifically, the opening process of the present embodiment is shown in fig. 4 to 6 in sequence:
as shown in fig. 4, in the closing state, the fixed arc extinguishing chamber contact 11 and the moving arc extinguishing chamber contact 12 are in contact, the isolating blade 21 and the fixed isolating contact 22 are in contact, the transmission block 32 is at the leftmost end of the limiting slot 311, and the guide shaft 33 is at the bottommost end of the pushing section 3122. When the brake is released, the pull rod assembly 4 is lifted upwards, the transmission block 32 slides rightward, and the guide shaft 33 slides upwards until the state shown in fig. 5 is reached.
As shown in fig. 5, in the intermediate state of closing-opening, the fixed contacts 11 and 12 are in a separated state (i.e. the vacuum interrupter 1 is in an opening state), the isolating blade 21 and the fixed contacts 22 are still in a contact state, the transmission block 32 is at the rightmost end of the limiting slot 311, and the guide shaft 33 is at the uppermost end of the pushing section 3122. Continued operation of the pull rod assembly 4 pulls upward until the condition shown in fig. 6 is reached.
As shown in fig. 6, in the opening state, the fixed arc-extinguishing chamber contact 11 and the moving arc-extinguishing chamber contact 12 are in a separated state, the isolating blade 21 and the fixed isolating contact 22 are in a separated state, the distance between the blade 21 and the fixed isolating contact 22 is greater than the minimum safety distance, the transmission block 32 is still at the rightmost end of the limiting slot 311, and the guide shaft 33 enters the delay section 3121 and reaches the uppermost end of the delay section 3121.
On the contrary, the closing process of the present embodiment is shown in fig. 6 to 4 in sequence:
as shown in fig. 6, in the opening state, the fixed arc-extinguishing chamber contact 11 and the moving arc-extinguishing chamber contact 12 are in a separated state, the isolating blade 21 and the fixed isolating contact 22 are in a separated state, the distance between the blade 21 and the fixed isolating contact 22 is greater than the minimum safety distance, the transmission block 32 is still at the rightmost end of the limiting slot 311, and the guide shaft 33 is at the uppermost end of the delay period 3121. When closing the switch, the pull rod assembly 4 pushes the transmission block 32 downwards to keep still, and the guide shaft 33 slides downwards until reaching the state shown in fig. 5.
As shown in fig. 5, in the intermediate state of opening-closing, the fixed contacts 11 and 12 are still in the separated state, the isolating blade 21 and the fixed contacts 22 are still in the contact state (i.e. the isolating component 2 is in the closed state), the transmission block 32 is still at the rightmost end of the limiting slot 311, and the guide shaft 33 is at the bottommost end of the delay period 3121. Continued operation of the pull rod assembly 4 pushes downwardly until the condition shown in fig. 4 is reached.
As shown in fig. 4, in the closing state, the fixed arc extinguishing chamber contact 11 and the moving arc extinguishing chamber contact 12 are in contact, the isolating blade 21 and the fixed isolating contact 22 are in contact, the transmission block 32 is at the leftmost end of the limiting slot 311, and the guide shaft 33 is at the bottommost end of the pushing section 3122.
It should be noted that this embodiment is mainly applied to a vacuum circuit breaker on a column, but is not excluded from being applied to other circuit breakers, load switches, and combined electrical apparatuses.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The utility model provides a built-in isolated vacuum interrupter combination, includes vacuum interrupter, its characterized in that: the device also comprises an isolation assembly, a linkage assembly and a pull rod assembly; the vacuum arc-extinguishing chamber is connected with the isolation assembly in series, and the pull rod assembly is connected with the operating mechanism;
the pull rod assembly acts, and the vacuum arc-extinguishing chamber and the isolation assembly are driven to act respectively through the linkage assembly; when the vacuum arc extinguishing chamber is opened, the vacuum arc extinguishing chamber firstly performs opening action, and the isolation assembly is then opened; when the switch-on is performed, the isolation assembly performs switch-on action firstly, and performs switch-on action after the vacuum arc extinguishing chamber;
the vacuum arc-extinguishing chamber comprises an arc-extinguishing chamber fixed contact and an arc-extinguishing chamber movable contact, the isolation assembly comprises an isolation blade, an isolation fixed contact and a conductive block, and the linkage assembly comprises a bracket, a transmission block, a guide shaft, a first connecting rod and a second connecting rod;
the support is fixedly arranged, and a limit groove and a guide groove are formed in the support; the transmission block is fixedly arranged on the movable contact of the arc extinguish chamber, the transmission block can slide along the limiting groove, and when the transmission block slides in the limiting groove, the movable contact of the arc extinguish chamber can be contacted with or separated from the fixed contact of the arc extinguish chamber; the conducting block is fixedly arranged, the conducting block is electrically connected with the moving contact of the arc extinguish chamber, the rear end of the isolating knife board is rotationally arranged on the conducting block, the isolating static contact is fixedly arranged, and when the isolating knife board rotates on the conducting block, the front end of the isolating knife board can be contacted with or separated from the isolating static contact; the guide shaft is rotatably arranged at the lower end of the pull rod assembly, and can slide along the guide groove; one end of the first connecting rod is rotatably arranged on the guide shaft, and the other end of the first connecting rod is rotatably arranged on the transmission block; one end of the second connecting rod is rotatably arranged on the guide shaft, and the other end of the second connecting rod is rotatably arranged at the middle section of the isolating knife board;
the pull rod assembly drives the guide shaft to slide in the guide groove, the guide shaft drives the transmission block to slide in the limit groove through the first connecting rod, and the guide shaft drives the isolation knife board to rotate on the conductive block through the second connecting rod, so that the vacuum arc-extinguishing chamber and the isolation assembly are delayed to be switched on and off;
the limiting groove is of a transverse linear structure, the guide groove is of a curved knife type structure, and the guide groove comprises a delay section and a mutation section; when the guide shaft slides in the delay section, the transmission block is always positioned at the right end of the limiting groove, and when the guide shaft slides in the abrupt section, the transmission block slides in the limiting groove.
2. The built-in isolated vacuum interrupter assembly of claim 1, wherein: the abrupt segment is obliquely downwards arranged, and the lower end of the abrupt segment is close to the limiting groove.
3. The vacuum interrupter assembly of claim 2, wherein: and an insulating cover is fixedly arranged outside the vacuum arc-extinguishing chamber combination.
4. A vacuum circuit breaker, characterized in that: a vacuum interrupter assembly comprising a built-in isolator according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910122339.1A CN109712842B (en) | 2019-02-19 | 2019-02-19 | Built-in isolated vacuum arc-extinguishing chamber combination and vacuum circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910122339.1A CN109712842B (en) | 2019-02-19 | 2019-02-19 | Built-in isolated vacuum arc-extinguishing chamber combination and vacuum circuit breaker |
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| Publication Number | Publication Date |
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| CN109712842A CN109712842A (en) | 2019-05-03 |
| CN109712842B true CN109712842B (en) | 2024-03-29 |
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| CN201910122339.1A Active CN109712842B (en) | 2019-02-19 | 2019-02-19 | Built-in isolated vacuum arc-extinguishing chamber combination and vacuum circuit breaker |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993429A (en) * | 2019-12-25 | 2020-04-10 | 宁波天安智能电网科技股份有限公司 | Combined linkage assembly of vacuum circuit breaker |
| CN112750652A (en) * | 2020-12-30 | 2021-05-04 | 北京双杰电气股份有限公司 | Load switch |
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|---|---|---|---|---|
| US6472627B1 (en) * | 1999-10-26 | 2002-10-29 | Lg Industrial Systems Co., Ltd. | Vacuum circuit breaker |
| CN201732721U (en) * | 2010-05-12 | 2011-02-02 | 郑文秀 | Permanent magnet high-voltage vacuum circuit breaker |
| CN103903905A (en) * | 2014-04-11 | 2014-07-02 | 辽宁易德电气有限公司 | Opening and closing induction current vacuum switch device |
| CN106024498A (en) * | 2016-07-18 | 2016-10-12 | 江苏明及电气股份有限公司 | Vacuum circuit breaker |
| CN109065406A (en) * | 2018-09-06 | 2018-12-21 | 天津合纵电力设备有限公司 | Vacuum arc-extinguishing chamber assembly with built-in isolation fracture and vacuum circuit breaker |
| CN209418419U (en) * | 2019-02-19 | 2019-09-20 | 宁波天安智能电网科技股份有限公司 | The vacuum interrupter combination being isolated built in a kind of and vacuum circuit breaker |
-
2019
- 2019-02-19 CN CN201910122339.1A patent/CN109712842B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6472627B1 (en) * | 1999-10-26 | 2002-10-29 | Lg Industrial Systems Co., Ltd. | Vacuum circuit breaker |
| CN201732721U (en) * | 2010-05-12 | 2011-02-02 | 郑文秀 | Permanent magnet high-voltage vacuum circuit breaker |
| CN103903905A (en) * | 2014-04-11 | 2014-07-02 | 辽宁易德电气有限公司 | Opening and closing induction current vacuum switch device |
| CN106024498A (en) * | 2016-07-18 | 2016-10-12 | 江苏明及电气股份有限公司 | Vacuum circuit breaker |
| CN109065406A (en) * | 2018-09-06 | 2018-12-21 | 天津合纵电力设备有限公司 | Vacuum arc-extinguishing chamber assembly with built-in isolation fracture and vacuum circuit breaker |
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