CN105070577A - Isolation grounding switch mechanism, single-pole component and GIS electrical equipment - Google Patents
Isolation grounding switch mechanism, single-pole component and GIS electrical equipment Download PDFInfo
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- 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
- H01H31/04—Interlocking mechanisms
- H01H31/10—Interlocking mechanisms for interlocking two or more switches
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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
- H02B13/075—Earthing arrangements
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Abstract
本发明涉及高压开关领域，特别涉及一种隔离接地开关机构、单极组件和GIS电气设备。隔离接地开关机构包括外壳和装配在外壳上的呈“L”形分布的隔离开关和接地开关，隔离开关包括隔离开关动触头和隔离开关静触头，接地开关包括接地开关动触头和接地开关静触头，隔离开关和接地开关之间设有用于与电压互感器电连接的连接触头座，所述隔离开关静触头和接地开关动触头集成在连接触头座上，所述隔离开关动触头与主导电回路电连接，所述接地开关动触头与地电位电连接。将隔离开关和接地开关组合在一起，总体元件和对接面少、结构简单紧凑。
The invention relates to the field of high-voltage switches, in particular to an isolation and grounding switch mechanism, a single-pole assembly and GIS electrical equipment. The isolating and grounding switch mechanism includes a shell and an "L"-shaped isolating switch and grounding switch assembled on the shell. The isolating switch includes a moving contact of the isolating switch and a static contact of the isolating switch. The static contact of the switch, the connecting contact seat for electrical connection with the voltage transformer is provided between the isolating switch and the grounding switch, the static contact of the isolating switch and the moving contact of the grounding switch are integrated on the connecting contact seat, the The moving contact of the isolating switch is electrically connected to the main conductive circuit, and the moving contact of the grounding switch is electrically connected to the ground potential. Combining the isolating switch and the grounding switch together, the overall components and joint surfaces are few, and the structure is simple and compact.
Description
技术领域 technical field
本发明涉及高压开关领域，特别涉及一种隔离接地开关机构、单极组件和GIS电气设备。 The invention relates to the field of high-voltage switches, in particular to an isolation and grounding switch mechanism, a single-pole assembly and GIS electrical equipment.
背景技术 Background technique
目前在气体绝缘金属封闭开关设备（GIS）中，为实现对电压互感器感应电流的切合及对电压互感器进行接地保护，较多电压互感器配置有隔离接地机构，现大多采用单独的隔离、接地机构分别实现相应的功能，这样整体元件较多、成本较高。因此，有必要设计一种电压互感器用隔离开关与接地开关的组合机构。 At present, in the gas-insulated metal-enclosed switchgear (GIS), in order to realize the matching of the induced current of the voltage transformer and the grounding protection of the voltage transformer, many voltage transformers are equipped with an isolation grounding mechanism, and now most of them use a separate isolation, The grounding mechanisms respectively realize corresponding functions, so that there are many overall components and the cost is relatively high. Therefore, it is necessary to design a combined mechanism of an isolating switch and a grounding switch for a voltage transformer.
发明内容 Contents of the invention
本发明的目的在于提供一种结构紧凑的隔离接地开关机构，以及使用这种开关机构的单极组件和GIS电气设备。 The object of the present invention is to provide a compact isolating and grounding switch mechanism, and a single-pole assembly and GIS electrical equipment using the switch mechanism.
为实现上述目的，本发明隔离接地开关机构的技术方案是：隔离接地开关机构包括外壳和装配在外壳上的呈“L”形分布的隔离开关和接地开关，隔离开关包括隔离开关动触头和隔离开关静触头，接地开关包括接地开关动触头和接地开关静触头，隔离开关和接地开关之间设有用于与电压互感器电连接的连接触头座，所述隔离开关静触头和接地开关动触头集成在连接触头座上，所述隔离开关动触头与主导电回路电连接，所述接地开关动触头与地电位电连接。 In order to achieve the above object, the technical solution of the isolating and grounding switch mechanism of the present invention is: the isolating and grounding switch mechanism includes a casing and an isolating switch and a grounding switch assembled in an "L" shape on the casing, and the isolating switch includes a moving contact of the isolating switch and a The isolating switch static contact, the earthing switch includes the earthing switch moving contact and the earthing switch static contact, and the connecting contact seat for electrical connection with the voltage transformer is provided between the isolating switch and the earthing switch, and the isolating switch static contact The moving contact of the grounding switch is integrated on the connection contact seat, the moving contact of the isolating switch is electrically connected to the main conductive circuit, and the moving contact of the grounding switch is electrically connected to the ground potential.
隔离接地开关机构包括位于外壳中的导向触头座，所述隔离开关动触头导向穿装在导向触头座中，导向触头座上装配有主导电回路导电杆。 The isolating grounding switch mechanism includes a guide contact seat located in the shell, the moving contact of the isolating switch is guided and installed in the guide contact seat, and the guide contact seat is equipped with a conductive rod of the main conductive circuit.
所述隔离开关动触头和接地开关动触头上均设有用于将转动运动转化为直线运动的角形驱动机构。 Both the isolating switch moving contact and the earthing switch moving contact are provided with angular drive mechanisms for converting rotational motion into linear motion.
所述隔离开关与接地开关之间电气连锁，通过控制回路实现在隔离开关合闸时接地开关合闸无效，接地开关合闸时隔离开关合闸无效。 The electrical interlocking between the isolating switch and the grounding switch is realized through the control circuit when the isolating switch is closed when the grounding switch is closed, and when the grounding switch is closed, the isolating switch is closed and is invalid.
本发明单极组件的技术方案是：单极组件包括隔离接地开关机构和与隔离接地开关机构电连接的电压互感器，隔离接地开关机构包括外壳和装配在外壳上的呈“L”形分布的隔离开关和接地开关，隔离开关包括隔离开关动触头和隔离开关静触头，接地开关包括接地开关动触头和接地开关静触头，隔离开关和接地开关之间设有与电压互感器电连接的连接触头座，所述隔离开关静触头和接地开关动触头集成在连接触头座上，所述隔离开关动触头与主导电回路电连接，所述接地开关动触头与地电位电连接。 The technical solution of the single-pole assembly of the present invention is: the single-pole assembly includes an isolation grounding switch mechanism and a voltage transformer electrically connected to the isolation grounding switch mechanism, and the isolation grounding switch mechanism includes a casing and "L"-shaped distribution on the casing. The isolating switch and the earthing switch, the isolating switch includes the moving contact of the isolating switch and the static contact of the isolating switch, the earthing switch includes the moving contact of the earthing switch and the static contact of the earthing switch, and there is a connection with the voltage transformer between the isolating switch and the earthing switch connected connecting contact seat, the isolating switch static contact and the earthing switch moving contact are integrated on the connecting contact seat, the isolating switch moving contact is electrically connected to the main conductive circuit, and the earthing switch moving contact is connected to the ground potential electrical connection.
所述隔离开关与接地开关之间电气连锁，通过控制回路实现在隔离开关合闸时接地开关合闸信号无效，接地开关合闸时隔离开关合闸信号无效。 The electrical interlocking between the isolating switch and the grounding switch realizes that the closing signal of the grounding switch is invalid when the isolating switch is closed, and the closing signal of the isolating switch is invalid when the grounding switch is closed through the control loop.
隔离接地开关机构包括位于外壳中的导向触头座，所述隔离开关动触头导向穿装在导向触头座中，导向触头座上装配有主导电回路导电杆。 The isolating grounding switch mechanism includes a guide contact seat located in the shell, the moving contact of the isolating switch is guided and installed in the guide contact seat, and the guide contact seat is equipped with a conductive rod of the main conductive circuit.
本发明GIS电气设备的技术方案是：GIS电气设备包括单极组件，单极组件包括隔离接地开关机构和与隔离接地开关机构电连接的电压互感器，隔离接地开关机构包括外壳和装配在外壳上的呈“L”形分布的隔离开关和接地开关，隔离开关包括隔离开关动触头和隔离开关静触头，接地开关包括接地开关动触头和接地开关静触头，隔离开关和接地开关之间设有与电压互感器电连接的连接触头座，所述隔离开关静触头和接地开关动触头集成在连接触头座上，所述隔离开关动触头与主导电回路电连接，所述接地开关动触头与地电位电连接。 The technical scheme of the GIS electrical equipment of the present invention is: the GIS electrical equipment includes a single-pole assembly, the single-pole assembly includes an isolation grounding switch mechanism and a voltage transformer electrically connected with the isolation grounding switch mechanism, the isolation grounding switch mechanism includes a shell and is assembled on the shell The isolating switch and grounding switch distributed in an "L" shape. The isolating switch includes the moving contact of the isolating switch and the static contact of the isolating switch. There is a connecting contact seat electrically connected with the voltage transformer, the isolating switch static contact and the earthing switch moving contact are integrated on the connecting contact seat, and the isolating switch moving contact is electrically connected to the main conductive circuit. The moving contact of the grounding switch is electrically connected to the ground potential.
所述隔离开关与接地开关之间电气连锁，通过控制回路实现在隔离开关合闸时接地开关合闸信号无效，接地开关合闸时隔离开关合闸信号无效。 The electrical interlocking between the isolating switch and the grounding switch realizes that the closing signal of the grounding switch is invalid when the isolating switch is closed, and the closing signal of the isolating switch is invalid when the grounding switch is closed through the control loop.
隔离接地开关机构包括位于外壳中的导向触头座，所述隔离开关动触头导向穿装在导向触头座中，导向触头座上装配有主导电回路导电杆。 The isolating grounding switch mechanism includes a guide contact seat located in the shell, the moving contact of the isolating switch is guided and installed in the guide contact seat, and the guide contact seat is equipped with a conductive rod of the main conductive circuit.
本发明的有益效果是：隔离开关和接地开关以及二者之间的连接触头座呈“L”形分布，且隔离开关静触头和接地开关动触头集成在连接触头座上，将隔离开关和接地开关组合在一起，总体元件和对接面少、结构简单紧凑。 The beneficial effects of the present invention are: the isolating switch and the grounding switch and the connecting contact seat between them are distributed in an "L" shape, and the static contact of the isolating switch and the moving contact of the grounding switch are integrated on the connecting contact seat, The isolating switch and the grounding switch are combined together, and the overall components and joint surfaces are few, and the structure is simple and compact.
进一步地，使隔离开关与接地开关之间电气连锁，避免事故发生，安全可靠。 Further, the electrical interlocking between the isolating switch and the grounding switch can avoid accidents and is safe and reliable.
附图说明 Description of drawings
图1为本发明使用隔离接地开关机构的单极组件的实施例的结构示意图； Fig. 1 is the structure schematic diagram of the embodiment of the single-pole assembly that uses isolation grounding switch mechanism of the present invention;
图2为本发明GIS电气设备的实施例的结构示意图。 Fig. 2 is a schematic structural diagram of an embodiment of the GIS electrical equipment of the present invention.
具体实施方式 Detailed ways
下面结合附图对本发明的实施方式作进一步说明。 Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
本发明的使用隔离接地开关机构的单极组件的具体实施例，如图1所示，单极组件包括隔离接地开关机构和与隔离接地开关机构电连接的电压互感器7，隔离接地开关机构包括外壳2和装配在外壳2上的呈“L”形分布的隔离开关1和接地开关5，隔离开关1包括隔离开关动触头11和隔离开关静触头12，接地开关5包括接地开关动触头51和接地开关静触头52，隔离开关1和接地开关5之间设有与电压互感器7电连接的连接触头座6，隔离开关静触头12和接地开关动触头52集成装配在连接触头座6上，隔离开关动触头11与主导电回路电连接，接地开关动触头51与地电位电连接。隔离接地开关机构包括位于外壳2中的导向触头座4，隔离开关动触头11导向穿装在导向触头座4中，导向触头座4上装配有与主导电回路导电杆3。 The specific embodiment of the unipolar assembly using the isolation and grounding switch mechanism of the present invention, as shown in Figure 1, the unipolar assembly includes an isolation and grounding switch mechanism and a voltage transformer 7 electrically connected to the isolation and grounding switch mechanism, and the isolation and grounding switch mechanism includes The casing 2 and the isolating switch 1 and the grounding switch 5 assembled in an "L" shape on the casing 2, the isolating switch 1 includes the moving contact 11 of the isolating switch and the static contact 12 of the isolating switch, and the grounding switch 5 includes the moving contact of the grounding switch The head 51 and the static contact 52 of the earthing switch, the connection contact seat 6 electrically connected with the voltage transformer 7 is provided between the disconnector 1 and the earthing switch 5, the static contact 12 of the disconnector and the moving contact 52 of the earthing switch are integrated and assembled On the connection contact seat 6, the isolating switch moving contact 11 is electrically connected to the main conductive circuit, and the earthing switch moving contact 51 is electrically connected to the ground potential. The isolating grounding switch mechanism includes a guide contact seat 4 located in the housing 2, the isolating switch moving contact 11 is guided and installed in the guide contact seat 4, and the guide contact seat 4 is equipped with the conductive rod 3 of the main conductive circuit.
外壳2为五通筒体结构，外壳2上分别密封地安装有隔离开关1、主导电回路导电杆3、接地开关5、电压互感器7及连接器件（图中未示出）。外壳2内充有相对压力为0.5Mpa的SF6绝缘气体，以满足绝缘要求。隔离开关动触头11和接地开关动触头51上均设有用于将转动运动转化为直线运动的角形驱动机构。隔离开关1为角形隔离开关，还包括金属外壳、拐臂、导向支撑座以及位于导向支撑座中的轴线沿上下方向延伸的绝缘拉杆，隔离开关动触头11安装在绝缘拉杆的下端，金属外壳能够保证大气与绝缘气体的隔离，拐臂与位于导向支撑座中的绝缘拉杆形成曲柄连杆机构，能够把对角形隔离开关的转动操作转化为隔离开关动触头11在上下方向的竖直移动。接地开关5为角形接地开关，与角形隔离开关的结构类似，通过曲柄连杆机构将转动操作转化为接地开关动触头51在左右方向的水平移动。导向触头座4和连接触头座6上下间隔设置在外壳2中。隔离开关动触头11具有分别连通和断开导向触头座4和连接触头座6之间电连接的连通位和断开位，对应地，隔离开关1分别处于合闸和分闸状态。当隔离开关动触头11向下移动至与隔离开关静触头12相插接的连通位时（即图1中11’的位置），隔离开关1处于合闸状态，此时使连接触头座6上的接地开关5保持分闸状态，导向触头座4与连接触头座6通过隔离开关动触头11电连接，连接触头座6上的电压互感器7与第一点连接头4上的主导电回路接通。当隔离开关动触头11向上移动至与隔离开关静触头12相分离的断开位时，隔离开关1处于分闸状态，导向触头座4与连接触头座6之间的电路断开，此时，通过控制接地开关动触头51和接地开关静触头52的插配与分离，即接地开关5合闸与分闸，能够实现电压互感器7与地电位的连通和断开。隔离开关1与接地开关5电气连锁，避免误操作。通过控制回路闭锁实现在隔离开关1合闸时，接地开关5合闸无效；接地开关5合闸时，隔离开关1合闸无效，以避免事故发生。 The shell 2 is a five-way cylinder structure, and the isolating switch 1, the main conductive circuit conductive rod 3, the grounding switch 5, the voltage transformer 7 and the connecting device (not shown in the figure) are respectively hermetically installed on the shell 2. The shell 2 is filled with SF 6 insulating gas with a relative pressure of 0.5Mpa to meet the insulation requirements. Both the isolating switch moving contact 11 and the earthing switch moving contact 51 are provided with angular drive mechanisms for converting rotational motion into linear motion. The isolating switch 1 is an angle isolating switch, which also includes a metal case, a crank arm, a guide support seat, and an insulating pull rod whose axis in the guide support seat extends along the up and down direction. It can ensure the isolation of atmosphere and insulating gas. The crank arm and the insulating pull rod located in the guide support seat form a crank linkage mechanism, which can convert the rotation operation of the diagonal isolating switch into the vertical movement of the moving contact 11 of the isolating switch in the up and down direction. . The earthing switch 5 is an angle earthing switch, which is similar in structure to the angle isolating switch, and the rotation operation is converted into the horizontal movement of the earthing switch moving contact 51 in the left and right direction through the crank linkage mechanism. The guide contact seat 4 and the connection contact seat 6 are arranged in the housing 2 at intervals up and down. The isolating switch movable contact 11 has a connecting position and a disconnecting position for respectively connecting and disconnecting the electrical connection between the guiding contact seat 4 and the connecting contact seat 6. Correspondingly, the isolating switch 1 is in the closed state and the open state respectively. When the moving contact 11 of the isolating switch moves down to the connection position (that is, the position of 11' in Fig. 1 ), which is connected with the static contact 12 of the isolating switch, the isolating switch 1 is in the closed state, and at this time the connecting contact The grounding switch 5 on the seat 6 is kept in an open state, the guide contact seat 4 is electrically connected to the connecting contact seat 6 through the moving contact 11 of the isolating switch, and the voltage transformer 7 on the connecting contact seat 6 is connected to the first point connector The main conductive loop on 4 is connected. When the movable contact 11 of the isolating switch moves upward to the off position separated from the static contact 12 of the isolating switch, the isolating switch 1 is in the opening state, and the circuit between the guiding contact seat 4 and the connecting contact seat 6 is disconnected , at this time, by controlling the mating and separation of the grounding switch movable contact 51 and the grounding switch static contact 52, that is, the closing and opening of the grounding switch 5, the connection and disconnection between the voltage transformer 7 and the ground potential can be realized. The isolating switch 1 is electrically interlocked with the grounding switch 5 to avoid misoperation. Through the control circuit locking, it is realized that when the isolating switch 1 is closed, the closing of the grounding switch 5 is invalid; when the grounding switch 5 is closed, the closing of the isolating switch 1 is invalid, so as to avoid accidents.
隔离开关主要实现电压互感器与主导电回路的连通与断开，当隔离开关把电压互感器与主导电回路断开时，接地开关主要实现电压互感器与地电位的连通与断开，以实现对电压互感器的保护。整体结构紧凑、元件少。 The isolating switch mainly realizes the connection and disconnection between the voltage transformer and the main conductive circuit. When the isolating switch disconnects the voltage transformer from the main conductive circuit, the grounding switch mainly realizes the connection and disconnection between the voltage transformer and the ground potential, so as to realize Protection of voltage transformers. The overall structure is compact and there are few components.
在其他实施例中，也可以省去导向触头座，可以使隔离开关动触头采用其他常规电连接方式接入主导电回路。 In other embodiments, the guide contact seat can also be omitted, and the movable contact of the isolating switch can be connected to the main conductive circuit by other conventional electrical connection methods.
在其它实施例中，还可以采用齿轮齿条机构或蜗轮蜗杆机构代替隔离开关动触头和接地开关动触头上的角形驱动机构。 In other embodiments, a rack-and-pinion mechanism or a worm gear mechanism can also be used to replace the angular drive mechanism on the movable contact of the isolating switch and the moving contact of the grounding switch.
在其他实施例中，也可以通过人工控制或者采用机械结构实现隔离开关与接地开关之间的连锁。 In other embodiments, the interlocking between the isolating switch and the grounding switch can also be realized through manual control or using a mechanical structure.
本发明的隔离接地开关机构的结构与上述实施例中单极组件的隔离接地开关机构的结构相同，在此不再赘述。 The structure of the isolating and grounding switch mechanism of the present invention is the same as the structure of the isolating and grounding switch mechanism of the single-pole assembly in the above embodiment, and will not be repeated here.
本发明GIS电气设备的具体实施例，如图2所示，GIS电气设备包括单极组件，该单极组件的结构与上述实施例中单极组件的结构相同，在此不再赘述。 As a specific embodiment of the GIS electrical equipment of the present invention, as shown in FIG. 2 , the GIS electrical equipment includes a unipolar assembly, and the structure of the unipolar assembly is the same as that of the unipolar assembly in the above embodiment, and will not be repeated here.
Claims (10)
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| CN201510457675.3A CN105070577A (en) | 2015-07-30 | 2015-07-30 | Isolation grounding switch mechanism, single-pole component and GIS electrical equipment |
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| CN201510457675.3A CN105070577A (en) | 2015-07-30 | 2015-07-30 | Isolation grounding switch mechanism, single-pole component and GIS electrical equipment |
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| CN201510457675.3A Pending CN105070577A (en) | 2015-07-30 | 2015-07-30 | Isolation grounding switch mechanism, single-pole component and GIS electrical equipment |
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| Country | Link |
|---|---|
| CN (1) | CN105070577A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105575698A (en) * | 2016-01-15 | 2016-05-11 | 许继（厦门）智能电力设备股份有限公司 | Earthing switch interlocking device of GIS combined electrical apparatus |
| CN105655913A (en) * | 2016-03-08 | 2016-06-08 | 河南平高电气股份有限公司 | Disconnecting grounding switch mechanism, switch equipment and guide contact base of disconnecting grounding switch mechanism |
| CN105702515A (en) * | 2016-03-08 | 2016-06-22 | 河南平高电气股份有限公司 | Isolating and grounding switch mechanism and gas-insulated metal-enclosed switchgear |
| WO2021052053A1 (en) * | 2019-09-18 | 2021-03-25 | 国网浙江省电力有限公司经济技术研究院 | Gas-insulated metal enclosed neutral point complete-set device |
| WO2022062210A1 (en) * | 2020-09-24 | 2022-03-31 | 河南平高电气股份有限公司 | Static end assembly and disconnecting and earthing switch |
| CN117220452A (en) * | 2023-08-11 | 2023-12-12 | 安徽合凯电气科技股份有限公司 | Special phase change switch for generator |
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| CN201374519Y (en) * | 2009-03-17 | 2009-12-30 | 现代重工(中国)电气有限公司 | Integral switching device for high-voltage enclosed type combination electrical apparatus |
| CN103972809A (en) * | 2013-01-28 | 2014-08-06 | 中电新源智能电网科技有限公司 | Double-breaker DCB type high-voltage composite apparatus |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105575698A (en) * | 2016-01-15 | 2016-05-11 | 许继（厦门）智能电力设备股份有限公司 | Earthing switch interlocking device of GIS combined electrical apparatus |
| CN105575698B (en) * | 2016-01-15 | 2018-01-09 | 许继（厦门）智能电力设备股份有限公司 | GIS combination electric appliance ground switch interlocking device |
| CN105655913A (en) * | 2016-03-08 | 2016-06-08 | 河南平高电气股份有限公司 | Disconnecting grounding switch mechanism, switch equipment and guide contact base of disconnecting grounding switch mechanism |
| CN105702515A (en) * | 2016-03-08 | 2016-06-22 | 河南平高电气股份有限公司 | Isolating and grounding switch mechanism and gas-insulated metal-enclosed switchgear |
| WO2017152667A1 (en) * | 2016-03-08 | 2017-09-14 | 国家电网公司 | Isolation and grounding switch mechanism, switchgear, and guide contact base thereof |
| WO2017152668A1 (en) * | 2016-03-08 | 2017-09-14 | 国家电网公司 | Isolating and grounding switch mechanism and gas-insulated metal-enclosed switchgear |
| CN105655913B (en) * | 2016-03-08 | 2018-03-02 | 河南平高电气股份有限公司 | Isolation earthing switch mechanism, switchgear and its guidance contacts seat |
| CN105702515B (en) * | 2016-03-08 | 2018-03-02 | 河南平高电气股份有限公司 | A kind of isolation earthing switch mechanism and Cubicle Gas-Insulated Switchgear |
| WO2021052053A1 (en) * | 2019-09-18 | 2021-03-25 | 国网浙江省电力有限公司经济技术研究院 | Gas-insulated metal enclosed neutral point complete-set device |
| WO2022062210A1 (en) * | 2020-09-24 | 2022-03-31 | 河南平高电气股份有限公司 | Static end assembly and disconnecting and earthing switch |
| CN117220452A (en) * | 2023-08-11 | 2023-12-12 | 安徽合凯电气科技股份有限公司 | Special phase change switch for generator |
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