CN109216099B - GIS equipment, switching device and three-phase transmission mechanism thereof - Google Patents
GIS equipment, switching device and three-phase transmission mechanism thereof Download PDFInfo
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- CN109216099B CN109216099B CN201710525828.2A CN201710525828A CN109216099B CN 109216099 B CN109216099 B CN 109216099B CN 201710525828 A CN201710525828 A CN 201710525828A CN 109216099 B CN109216099 B CN 109216099B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 153
- 230000016507 interphase Effects 0.000 claims abstract description 13
- 238000002955 isolation Methods 0.000 claims description 39
- 238000000926 separation method Methods 0.000 abstract description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 244000309464 bull Species 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- H01H33/02—Details
- H01H33/42—Driving mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
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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
- H02B13/0352—Gas-insulated switchgear for three phase switchgear
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention provides a GIS device, a switch device and a three-phase transmission mechanism thereof, which are used for indicating the on-off state of a three-phase switch. The three-phase transmission mechanism for the switching device comprises three transmission gear boxes which are longitudinally arranged at intervals, each transmission gear box comprises an input shaft extending longitudinally and an output shaft extending into a corresponding switching air chamber, an interphase transmission shaft is connected between the input shafts of two adjacent transmission gear boxes in a transmission manner, one of the input shafts or the interphase transmission shaft is provided with a power input part, and the transmission mechanism further comprises an indication mark which is used for acting under the driving of the input shaft of the corresponding transmission gear box so as to display the three-phase switching air chamber separation and combination state of the switching device. The indicating mark is connected on the input shaft in a transmission way, so that an operator can accurately and visually judge the on-off state, and the problem that the actual position of the moving contact cannot be observed in the prior art is solved.
Description
Technical Field
The invention relates to GIS equipment, a switch device and a three-phase transmission mechanism thereof.
Background
With the development of global power system and the increasing requirement for the reliability of system operation, SF6Gas Insulated metal-enclosed Switchgear (GIS) is becoming more and more widely used. The isolation grounding switch is an important component in the GIS equipment, the isolation switch (DS) has the capability of switching small current and bus conversion current, and the grounding switch (ES) has the function of ensuring the reliable grounding of the equipment and lines. In order to avoid misoperation and simplify electrical interlocking, an isolation grounding switch in a three-position mode is adopted in 126-252kV GIS equipment generally: the isolating switch and the grounding switch share one moving contact, and three working conditions, namely an isolating switch closing position, a grounding switch closing position and a double-division position, are realized through the linear motion of the moving contact. The moving contact is positioned inside the isolation grounding switch and is positioned in SF6In the gas, the rotating force of an external electric mechanism needs to be transmitted to the internal moving contact by using a transmission mechanism to push the moving contact to move.
Because GIS equipment generally adopts the compactification design at present, the looks interval of equipment is limited, and traditional contact observation window can't realize observing the actual position of the inside moving contact of isolation earthing switch and confirm. The isolation grounding switch usually adopts three-phase mechanical transmission, when transmission torque output from the electric mechanism is transmitted to the moving contact at the farthest position, transmission errors can occur in the transmission process, namely, whether the moving contact on the side phase is in place or not can not be accurately judged after the electric mechanism rotates for a certain angle. Therefore, the actual position of the inner contact of each phase isolating grounding switch needs to be clearly indicated through the switching and connecting indicating device.
Disclosure of Invention
The invention aims to provide a three-phase transmission mechanism for indicating the on-off state of a three-phase switch, and also provides a switch device and GIS equipment using the three-phase transmission mechanism.
In order to achieve the purpose, the technical scheme of the three-phase transmission mechanism for the switch device is as follows: the utility model provides a three-phase drive mechanism for switching device, including the transmission gear case of three longitudinal interval arrangement, each transmission gear case all includes along the income power axle of longitudinal extension and be used for stretching into the play power axle in the corresponding switch air chamber, the transmission is connected with alternate transmission shaft between the income power axle of two adjacent transmission gear cases, one of them income power axle or alternate transmission shaft have power input portion, drive mechanism still includes the instruction mark that is used for the three-phase switch air chamber deciliter state of action in order to show switching device under the income power axle drive of corresponding transmission gear case.
Furthermore, the three transmission gear boxes are respectively a middle transmission gear box and side transmission gear boxes positioned on two sides, the power input part is positioned on one of the alternate transmission shafts, and the input shaft of each side transmission gear box is in transmission connection with the indicating mark.
Furthermore, the three-phase transmission mechanism comprises a support frame which is used for being fixed on the switch air chamber or the transmission gear box, the indication mark is a pointer which is rotatably arranged on the support frame, an indication board is further arranged on the support frame, and the pointer is in transmission connection with the input shaft of the corresponding transmission gear box through a reduction gear mechanism.
The technical scheme of the switching device is as follows: the utility model provides a switching device, including the three-phase switch air chamber, switching device still includes three phase drive mechanism, three phase drive mechanism includes the transmission gear case of three vertical interval arrangement, each transmission gear case all includes along the income power axle of vertical extension and stretches into the output shaft in the corresponding switch air chamber, the transmission is connected with alternate transmission shaft between the income power axle of two adjacent transmission gear cases, one of them income power axle or alternate transmission shaft have power input part, drive mechanism still includes the instruction sign of action in order to show switching device's three-phase switch air chamber deciliter state under the income power axle drive of corresponding transmission gear case.
Furthermore, the three transmission gear boxes are respectively a middle transmission gear box and side transmission gear boxes positioned on two sides, the power input part is positioned on one of the alternate transmission shafts, and the input shaft of each side transmission gear box is in transmission connection with the indicating mark.
Furthermore, the three-phase transmission mechanism comprises a support frame fixed on the switch air chamber or the transmission gear box, the indication mark is a pointer which is rotatably arranged on the support frame, an indication board is further arranged on the support frame, and the pointer is in transmission connection with the input shaft of the corresponding transmission gear box through a reduction gear mechanism.
Further, the switch device is an isolation grounding switch device which comprises three phases of isolation grounding switches with the switch air chambers.
The GIS equipment of the invention has the technical scheme that: the utility model provides a GIS equipment, including isolation earthing switch device, isolation earthing switch device includes three-phase isolation earthing switch, each isolation earthing switch all includes the switch air chamber, isolation earthing switch device still includes three phase drive mechanism, three phase drive mechanism includes three transmission gear box of vertical interval arrangement, each transmission gear box all includes along the income power axle of longitudinal extension and stretches into the play power axle in the corresponding switch air chamber, the transmission is connected with alternate transmission shaft between the income power axle of two adjacent transmission gear boxes, one of them income power axle or alternate transmission shaft have power input part, drive mechanism still includes the instruction mark of action in order to show switching device's three-phase switch air chamber deciliter state under the income power axle drive of corresponding transmission gear box.
Furthermore, the three transmission gear boxes are respectively a middle transmission gear box and side transmission gear boxes positioned on two sides, the power input part is positioned on one of the alternate transmission shafts, and the input shaft of each side transmission gear box is in transmission connection with the indicating mark.
Furthermore, the three-phase transmission mechanism comprises a support frame fixed on the switch air chamber or the transmission gear box, the indication mark is a pointer which is rotatably arranged on the support frame, an indication board is further arranged on the support frame, and the pointer is in transmission connection with the input shaft of the corresponding transmission gear box through a reduction gear mechanism.
The invention has the beneficial effects that: when the three-phase transmission mechanism provided by the invention is used, power is transmitted to the power input part of one input shaft or the interphase transmission shaft, and the other input shafts and the interphase transmission shaft are driven to rotate. The input shaft transmits the acting force to the output shaft, and the output shaft extends into the corresponding switch air chamber to drive the moving contact in the switch air chamber to act to complete the switching of the on-off state. The input shaft rotates, simultaneously, the input shaft can transmit the acting force to the indicating mark, and the indicating mark acts to display the on-off state of the three-phase switch air chamber of the switch device. The indicating mark is connected on the input shaft in a transmission way, so that an operator can accurately and visually judge the on-off state, and the problem that the actual position of the moving contact cannot be observed in the prior art is solved.
When the power input part is positioned on the interphase transmission shaft, only the indicating marks are required to be in transmission connection on the input shafts of the two side transmission gear boxes, the rotating action of the input shafts of the side transmission gear boxes is transmitted from the interphase transmission shaft with the power input part to two sides, and the opening and closing state displayed by the indicating marks connected with the input shafts of the side transmission gear boxes also simultaneously displays the opening and closing state of the switch air chamber corresponding to the middle transmission gear box.
Drawings
FIG. 1 is a schematic diagram of an open state of an embodiment of a switching device according to the present invention;
FIG. 2 is a schematic view of the assembled joint indicating device and transmission gearbox of FIG. 1;
FIG. 3 is a diagram showing a positional relationship between a pointer and an indication board in a switch-off state according to an embodiment of the present invention;
FIG. 4 is a schematic view of the transmission gearbox of FIG. 1;
FIG. 5 is a general schematic diagram of an embodiment of the switchgear of the present invention;
FIG. 6 is a schematic diagram of the isolation grounding switch of FIG. 5;
FIG. 7 is a schematic diagram of a grounding state in an embodiment of the switching device of the present invention;
fig. 8 is a diagram showing a positional relationship between the indicating needle and the indicating plate in a grounded state in the switch device of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 8, the embodiment of the switch device of the present invention is described by taking an isolation grounding switch device as an example. The isolation grounding switch device comprises three-phase isolation grounding switches 2 which are sequentially arranged and a three-phase transmission mechanism which drives each isolation grounding switch to be switched on and off and grounded. The three-phase transmission mechanism comprises a DS/ES mechanism 1 which is a power source of the three-phase transmission mechanism, a transmission rod 3 is connected outside the DS/ES mechanism 1, and the end part of the transmission rod 3 is connected with a reversing transmission gear box 5. In this embodiment, each of the isolation grounding switches is correspondingly provided with a transmission gear box 4.
As shown in fig. 4, the structure of the transmission gearbox is shown, the transmission gearbox comprises a transmission gearbox shell, an input shaft 8 is arranged in the transmission gearbox shell in a transverse direction (the direction is consistent with the longitudinal direction of fig. 1), the input shaft 8 penetrates through the transmission gearbox shell, the input shaft 8 is rotatably arranged on the transmission gearbox shell through a first bearing 44, a first bevel gear 41 is arranged on the input shaft 8, the shaft shoulder of the input shaft on one side of the first bevel gear 41 and the first bearing 44, the first oil seal 45 and the first end cover 46 on the other side are kept fixed in position. A second bearing, a second oil seal 48 and a second end cap 47 are also provided on the outside of the side of the input shaft 8 from which it passes. A vertical output shaft 43 is further arranged in the transmission gear box, a second bevel gear 42 is mounted at the end of the output shaft 43 in a rotation stopping mode, the second bevel gear 42 is in meshing transmission with the first bevel gear 41, a sealing ring 49 is arranged between the output shaft 43 and the shell of the transmission gear box, and a lubricating medium is filled between the sealing ring 49 and the output shaft 43, so that the lubricating performance is guaranteed. The engagement of the first bevel gear 41 and the second bevel gear 42 converts the rotational motion of the horizontal input shaft 8 into the rotational motion of the vertical output shaft 43, to which an insulating rod or the like can be connected to drive the contacts.
As can be seen from fig. 1, the isolated grounding switch device comprises three-phase isolated grounding switches 2 arranged up and down (i.e. arranged longitudinally), each isolated grounding switch 2 is provided with a transmission gear box 4, and an interphase transmission shaft 6 is connected between input shafts 8 of two adjacent transmission gear boxes 4. A reversing transmission gear box 5 is arranged at an interphase transmission shaft between the middle isolating grounding switch and the lower isolating grounding switch, the input end of the reversing transmission gear box 5 is connected with a transmission rod 3, and the transmission rod 3 is perpendicular to the axis of the interphase transmission shaft. And the switching indicating device 7 is arranged on the uppermost isolation grounding switch and the lowermost isolation grounding switch.
The separation and combination indicating device 7 comprises a support frame arranged on the isolation grounding switch, the support frame is fixed on the isolation grounding switch through fasteners such as screws 10 and the like, the support frame is of an L-shaped bending structure, a sign 14 is arranged on the upper portion of a vertical edge of the L-shaped support frame, three indicating areas are arranged on the sign 14, the three indicating areas are respectively 'ES closing', 'DS closing' and 'minute', and the three indicating areas are sequentially arranged along the circumferential direction. A through hole is formed in the position of the indicator 14, a flange bearing 16 is fixed on one side of the through hole, a pointer shaft 13 penetrates through the flange bearing 16, and a thrust washer 17 is mounted on the pointer shaft 13 to prevent the pointer shaft 13 from moving in the axial direction. A large gear 15 is also attached to the pointer shaft 13 in a rotation-stopped manner, and nuts are respectively attached to both ends of the pointer shaft 13. A pinion shaft is arranged at the penetrating end of the input shaft 8 through a set screw 11, so that synchronous rotation-stopping matching of the pinion shaft and the input shaft is realized, and a pinion 12 is arranged on the pinion shaft. The pinion 12 is in meshing transmission with the bull gear 15, and when the input shaft 8 rotates, the bull gear can be driven to rotate. Meanwhile, due to the transmission ratio of the small gear and the large gear, the angular velocity of the large gear is smaller than that of the small gear, and the large gear only rotates for less than one circle under the condition that the small gear rotates for multiple circles. The pointer can swing back and forth under the condition of less than one circle to complete the switching of the three indication areas.
In this embodiment, the switching indicator 7 only needs to be provided on the uppermost isolation ground switch and the lowermost isolation ground switch, that is, only needs to be provided on the isolation ground switches of the side phases. Because the power of the top isolating and grounding switch is transmitted by the transmission gear box corresponding to the isolating and grounding switch of the intermediate phase, when the top isolating and grounding switch completes switching-on and switching-off and grounding, the isolating and grounding switch of the intermediate phase also completes switching-on and switching-off and grounding.
The use process of the isolation grounding switch device comprises the following steps: the initial state of the isolation grounding switch device is set to be an opening state, namely, a moving contact of each isolation grounding switch is not in contact with a static contact or a grounding contact, and a pointer of the on-off indicating device points to a 'division' area at the moment. During grounding operation, the DS/ES mechanism drives the transmission rod to rotate, acting force is gradually transmitted to the input shaft corresponding to each phase-isolated grounding switch, the input shaft rotates to drive the output shaft to rotate and simultaneously drive the small gear to rotate, and the small gear drives the large gear and the pointer to rotate, so that the pointer swings anticlockwise to an 'ES-on' indication area to indicate that grounding is in place. During closing operation, the transmission rod drives the input shaft to rotate reversely, so that the pointer swings clockwise to return to the 'separating' area, and then continuously swings from the 'separating' area to the 'DS closing' indicating area to complete closing operation.
In this embodiment, since the transmission rod is connected to the interphase transmission shaft, the separation/combination indicating device needs to be disposed on both side phases. In this embodiment, the power input portion is located on the interphase transmission shaft and is a portion connected to the reversing gear box. In other embodiments, the transmission rod may be connected to the input shaft corresponding to one of the two side phases, at this time, the power input portion is located on the input shaft of one of the side-side transmission gear boxes, and power is transmitted from the side phase to the other side.
In other embodiments, the opening and closing and grounding states can be indicated in a pointer-free mode, and the opening and closing and grounding states can be displayed by using balls with different colors. In this embodiment, the pointer constitutes an indication mark.
In this embodiment, the indication mark swings to realize indication of different states. In other embodiments, the indication mark can be translated, the nut is sleeved on the external thread of the input shaft, the indication mark is installed on the nut, meanwhile, the nut or the indication mark is installed on the fixed structure in a guiding mode, and the nut or the indication mark cannot rotate due to the guiding installation of the nut structure, so that the nut can drive the indication mark to translate and point to different positions after the input shaft rotates.
In this embodiment, the support frame is fixed on the isolation grounding switch, and in other embodiments, the support frame can be fixed on the transmission gear box.
The above embodiments are described by taking an isolation grounding switch as an example, and in other embodiments, the switch may be a common isolation switch or a grounding switch.
In the embodiment of the three-phase transmission mechanism of the present invention, the structure of the three-phase transmission mechanism is the same as that of the above-mentioned embodiment, and the details thereof are not repeated herein.
In the embodiment of the GIS device of the present invention, the GIS device includes the isolation grounding switch device, and the structure thereof is the same as that of the above embodiment, and the details thereof are not repeated herein.
Claims (4)
1. A three-phase transmission mechanism for a switching device is characterized in that: the three transmission gear boxes are respectively a middle transmission gear box and side transmission gear boxes positioned at two sides, the input shafts of the side transmission gear boxes are in transmission connection with the indication marks, the three phase transmission mechanism for the switching device comprises a support frame fixed on the switching air chamber, and the indication marks are pointers arranged on the support frame in a rotating manner, still be equipped with the sign on the support frame, the pointer passes through reduction gear mechanism and is connected with the income power shaft transmission of corresponding transmission gear box, and the income power shaft rotates and drives the pinion and rotate when driving out power shaft pivoted, and the pinion drives gear wheel and pointer and rotates, and gear wheel and pinion constitute reduction gear group jointly, and the angular velocity of gear wheel is less than the angular velocity of pinion, and under the circumstances that the pinion rotated many rings, the gear wheel rotated not to the round.
2. A switchgear, includes three-phase switch gas chamber, its characterized in that: the three-phase transmission mechanism also comprises a support frame fixed on the switch air chamber, the indication mark is a pointer which is arranged on the support frame in a rotating way, still be equipped with the sign on the support frame, the pointer passes through reduction gear mechanism and is connected with the income power shaft transmission of corresponding transmission gear box, and the income power shaft rotates and drives the pinion and rotate when driving out power shaft pivoted, and the pinion drives gear wheel and pointer and rotates, and gear wheel and pinion constitute reduction gear group jointly, and the angular velocity of gear wheel is less than the angular velocity of pinion, and under the circumstances that the pinion rotated many rings, the gear wheel rotated not to the round.
3. The switching device according to claim 2, wherein: the switch device is an isolation grounding switch device which comprises three phases of isolation grounding switches with the switch air chambers.
4. The utility model provides a GIS equipment, includes isolation earthing switch device, and isolation earthing switch device includes three-phase isolation earthing switch, and each isolation earthing switch all includes switch air chamber, its characterized in that: the isolated grounding switch device also comprises a three-phase transmission mechanism, the three-phase transmission mechanism comprises three transmission gear boxes which are longitudinally arranged at intervals, each transmission gear box comprises an input shaft which longitudinally extends and an output shaft which extends into the corresponding switch air chamber, the input shafts of two adjacent transmission gear boxes are in transmission connection with an interphase transmission shaft, one of the interphase transmission shafts is provided with a power input part, the three-phase transmission mechanism also comprises an indication mark which is driven by the input shaft of the corresponding transmission gear box to act so as to display the on-off state of the three-phase switch air chamber of the switch device, the three transmission gear boxes are respectively a middle transmission gear box and side transmission gear boxes positioned on two sides, the input shafts of the side transmission gear boxes are in transmission connection with the indication mark, the three-phase transmission mechanism comprises a support frame which is fixed on the switch air chamber, and the indication mark is a pointer which is rotatably arranged, still be equipped with the sign on the support frame, the pointer passes through reduction gear mechanism and is connected with the income power shaft transmission of corresponding transmission gear box, and the income power shaft rotates and drives the pinion and rotate when driving out power shaft pivoted, and the pinion drives gear wheel and pointer and rotates, and gear wheel and pinion constitute reduction gear group jointly, and the angular velocity of gear wheel is less than the angular velocity of pinion, and under the circumstances that the pinion rotated many rings, the gear wheel rotated not to the round.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710525828.2A CN109216099B (en) | 2017-06-30 | 2017-06-30 | GIS equipment, switching device and three-phase transmission mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710525828.2A CN109216099B (en) | 2017-06-30 | 2017-06-30 | GIS equipment, switching device and three-phase transmission mechanism thereof |
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| Publication Number | Publication Date |
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| CN109216099A CN109216099A (en) | 2019-01-15 |
| CN109216099B true CN109216099B (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710525828.2A Active CN109216099B (en) | 2017-06-30 | 2017-06-30 | GIS equipment, switching device and three-phase transmission mechanism thereof |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110808189B (en) * | 2019-10-09 | 2022-03-08 | 平高集团有限公司 | Three-phase common-box isolating switch and high-voltage switch equipment |
| CN112713025A (en) * | 2020-12-14 | 2021-04-27 | 河南平高电气股份有限公司 | Three-phase linkage type electrical switch |
| CN113078010B (en) * | 2021-03-02 | 2024-05-14 | 正泰电气股份有限公司 | Centering device and centering method for insulating pull rod in three-station switch |
| CN116613023B (en) * | 2023-07-21 | 2023-09-26 | 江苏国控电力设备有限公司 | Misoperation preventing interlocking mechanism and device for gas-insulated metal-enclosed switch |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3473865B2 (en) * | 1994-05-13 | 2003-12-08 | 三菱電機株式会社 | Method and device for driving switchgear |
| CN201302944Y (en) * | 2008-10-22 | 2009-09-02 | 国网运行有限公司宜昌超高压管理处 | GIS slitter knife with position indicator |
| CN204045482U (en) * | 2014-06-30 | 2014-12-24 | 中国西电电气股份有限公司 | Isolating switch moving contact position monitoring device in a kind of GIS |
-
2017
- 2017-06-30 CN CN201710525828.2A patent/CN109216099B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3473865B2 (en) * | 1994-05-13 | 2003-12-08 | 三菱電機株式会社 | Method and device for driving switchgear |
| CN201302944Y (en) * | 2008-10-22 | 2009-09-02 | 国网运行有限公司宜昌超高压管理处 | GIS slitter knife with position indicator |
| CN204045482U (en) * | 2014-06-30 | 2014-12-24 | 中国西电电气股份有限公司 | Isolating switch moving contact position monitoring device in a kind of GIS |
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| CN109216099A (en) | 2019-01-15 |
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