CN211150398U - Auxiliary grounding switch and switch cabinet - Google Patents
Auxiliary grounding switch and switch cabinet Download PDFInfo
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- CN211150398U CN211150398U CN201921399148.1U CN201921399148U CN211150398U CN 211150398 U CN211150398 U CN 211150398U CN 201921399148 U CN201921399148 U CN 201921399148U CN 211150398 U CN211150398 U CN 211150398U
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- switch
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- grounding switch
- rotating shaft
- pressure plate
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Abstract
The utility model provides an auxiliary grounding switch and cubical switchboard. The static contact of the auxiliary grounding switch is positioned on the load side of the fuse, and the auxiliary grounding switch comprises a transmission connecting rod, a rotating shaft and a pressing plate assembly; the transmission connecting rod is used for connecting a grounding switch of the fuse, and the transmission connecting rod can be driven to move when the grounding switch is switched on or switched off; the rotating shaft is in transmission connection with the transmission connecting rod so as to drive the rotating shaft to rotate when the transmission connecting rod moves; the pressure plate assembly is used for being in contact with a fixed contact of the auxiliary grounding switch so as to close the auxiliary grounding switch; the pressure plate assembly is installed on the rotating shaft and rotates to a position contacting with the fixed contact along with the rotating shaft when the grounding switch is switched on. The utility model discloses technical scheme simple structure, the higher supplementary earthing switch of operational reliability.
Description
Technical Field
The utility model relates to a cubical switchboard field, in particular to supplementary earthing switch and cubical switchboard.
Background
For a load switch-fuse combined electrical appliance unit of an existing ring main unit (a switch cabinet used in an annular power distribution network), when an abnormal current occurs to fuse a fuse, the load switch-fuse combined electrical appliance unit can be grounded through a grounding switch to protect electrical equipment in the ring main unit. However, when the fuse is blown, the circuit in which the fuse is located is not closed, and the ground switch is located only on the bus line side of the fuse, so even if the ground switch is in the ground position, the load on the load side of the fuse cannot be protected from ground. Therefore, the auxiliary grounding switch is arranged at the lower end of the fuse, so that the load side of the fuse is subjected to grounding protection, and accidents are avoided. However, the existing auxiliary grounding switch has a complex structure and low working reliability.
The auxiliary grounding switch used in the domestic switch cabinet at present has a complex transmission structure and poor reliability.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a simple structure, the higher supplementary earthing switch of operational reliability.
In order to solve the technical problem, the utility model adopts the following technical scheme:
according to one aspect of the present invention, an auxiliary grounding switch is provided; the static contact of the auxiliary grounding switch is positioned on the load side of the fuse, and the auxiliary grounding switch comprises a transmission connecting rod, a rotating shaft and a pressing plate assembly; the transmission connecting rod is used for connecting a grounding switch of the fuse, and the transmission connecting rod can be driven to move when the grounding switch is switched on or switched off; the rotating shaft is in transmission connection with the transmission connecting rod so as to drive the rotating shaft to rotate when the transmission connecting rod moves; the pressure plate assembly is used for being in contact with a fixed contact of the auxiliary grounding switch so as to close the auxiliary grounding switch; the pressure plate assembly is installed on the rotating shaft and rotates to a position contacting with the fixed contact along with the rotating shaft when the grounding switch is switched on.
Optionally, the auxiliary earthing switch further comprises a first connecting crank arm and a mounting bracket; one end of the transmission connecting rod is connected with an operating mechanism of the grounding switch or a rotating shaft of the grounding switch in a connecting way, the other end of the transmission connecting rod is rotatably connected with one end of the first connecting crank arm, and the other end of the first connecting crank arm is fixedly connected with the rotating shaft; the rotating shaft is mounted on the mounting bracket.
Optionally, the mounting bracket is further provided with a limiting protrusion, and the limiting protrusion is used for limiting the rotation range of the first connecting lever.
Optionally, the pressure plate assembly includes a first pressure plate, a second pressure plate, and an elastic member connected between the first pressure plate and the second pressure plate, which are oppositely disposed; the first pressing plate is fixedly connected with the rotating shaft, and the second pressing plate is used for contacting the static contact to close the grounding switch.
Optionally, the pressing plate assembly further includes a flexible connecting arm, and the flexible connecting arm is connected to the end portions of the first pressing plate and the second pressing plate located on the same side so as to connect the first pressing plate and the second pressing plate.
Optionally, the flexible connecting arm is a flexible copper bar.
Optionally, the pressing plate assembly further includes a lockbolt and a locknut, the lockbolt sequentially penetrates through the first pressing plate and the second pressing plate, and the locknut is fixed at an end of the locknut; the elastic piece is a compression spring, and the compression spring is sleeved on the rod part of the anti-loosening bolt.
Optionally, the fixed contact is a screw, and the screw is connected to the load side of the fuse through a conductive sleeve.
Optionally, the auxiliary grounding switch further includes a shielding cover, and the shielding cover is covered outside the static contact.
According to another aspect of the present invention, a switch cabinet is provided, which comprises a fuse, an earthing switch, and the auxiliary earthing switch; the earthing switch is installed on a bus side of the fuse, and the auxiliary earthing switch is installed on a load side of the fuse.
Drawings
Fig. 1 is a schematic view of the internal structure of the switch cabinet of the present invention;
fig. 2 is a partial structural schematic diagram of the auxiliary earthing switch in fig. 1.
The reference numerals are explained below:
1. an auxiliary grounding switch; 11. a transmission connecting rod; 12. a rotating shaft; 13. a platen assembly; 131. a first platen; 132. a second platen; 133. an elastic member; 134. a flexible connecting arm; 135. a lock bolt; 136. a locknut; 14. a first connecting crank arm; 15. a second connecting crank arm; 16. mounting a bracket; 161. A limiting bulge; 17. static contact;
2. a grounding switch; 21. a working shaft;
3. a fuse; 4. a conductive sleeve.
Detailed Description
While the present invention may be susceptible to embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the disclosure and is not intended to limit the invention to that as illustrated herein.
Thus, a feature indicated in this specification will serve to explain one of the features of an embodiment of the disclosure, and not to imply that every embodiment of the disclosure must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
In the embodiments shown in the drawings, directional references (such as upper, lower, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
The embodiment provides a switch cabinet, which can be a ring main unit. Referring to fig. 1, the switch cabinet includes a fuse 3, a grounding switch 2, and an auxiliary grounding switch 1; the earthing switch 2 is mounted on the bus side of the fuse 3, and the auxiliary earthing switch 1 is mounted on the load side of the fuse 3. A load switch is generally arranged on the bus side of the fuse 3, and the fixed contact of the grounding switch 2 is connected between the load switch and the fuse 3 and is positioned on the bus side of the fuse 3.
Referring to fig. 1 and 2, the stationary contact 17 of the auxiliary grounding switch 1 of the present embodiment is located on the load side of the fuse 3, and the auxiliary grounding switch 1 includes a transmission link 11, a rotation shaft 12, and a pressing plate assembly 13. The transmission connecting rod 11 is connected with the grounding switch 2 of the fuse 3, and the transmission connecting rod 11 can be driven to move when the grounding switch 2 is switched on or switched off; the rotating shaft 12 is in transmission connection with the transmission connecting rod 11 so as to drive the rotating shaft 12 to rotate when the transmission connecting rod 11 moves; the pressure plate assembly 13 is used for contacting a static contact 17 of the auxiliary grounding switch 1 so as to close the auxiliary grounding switch 1; the pressing plate assembly 13 is installed on the rotating shaft 12 to rotate to a position contacting the stationary contact 17 along with the rotating shaft 12 when the earthing switch 2 is switched on, so that the auxiliary earthing switch 1 is switched on.
The earthing switch 2 has an operating shaft 21, and the earthing switch 2 is controlled to switch between the on position and the off position by controlling the operating shaft 21 to rotate. In this embodiment, the specific structure and operation of the earthing switch 2 are not limited. In general, the operating mechanism is used to control the rotation of the operating shaft 21 of the earthing switch 2, and thus the operating state of the earthing switch 2 is switched, and the operating mechanism may be a mechanical operating mechanism or an electronic operating mechanism, and is not limited in particular.
The transmission link 11 is connected between the grounding switch 2 and the rotating shaft 12 to transmit the closing or opening action of the grounding switch 2 to the rotating shaft 12, so as to trigger the auxiliary grounding switch 1 to synchronously perform the closing or opening operation along with the grounding switch 2. The connection of the transmission linkage 11 to the earthing switch 2 has at least two embodiments.
In an embodiment, one end of the transmission link 11 is in transmission connection with the working shaft 21 of the grounding switch 2, and when the working shaft 21 of the grounding switch 2 rotates, the transmission link 11 is driven to move. In another embodiment, the transmission link 11 is connected to the operating mechanism of the earthing switch 2. The operating mechanism may be a mechanical operating mechanism, so that when the mechanical operating mechanism operates the working shaft 21 of the grounding switch 2 to rotate, the mechanical operating mechanism can drive the transmission link 11 to move together, so as to drive the rotating shaft 12 of the auxiliary grounding switch 1 to move.
In this embodiment, the auxiliary earthing switch 1 further includes a first connecting crank 14 and a mounting bracket 16; one end of the transmission connecting rod 11 is connected with an operating mechanism of the grounding switch 2 or a rotating shaft 12 of the grounding switch 2, the other end of the transmission connecting rod 11 is rotatably connected with one end of a first connecting crank arm 14, and the other end of the first connecting crank arm 14 is fixedly connected with the rotating shaft 12; the rotating shaft 12 is mounted on a mounting bracket 16.
Here, the case where one end of the transmission link 11 is connected to the operating shaft 21 of the earthing switch 2 will be described as an example. Specifically, the transmission connecting rod 11 is connected with the working shaft 21 of the grounding switch 2 through the second connecting crank arm 15, one end of the second connecting crank arm 15 is sleeved on the working shaft 21 and is fixedly connected with the working shaft 21, and the other end of the second connecting crank arm 15 is rotatably connected with the transmission connecting rod 11 through a pin shaft.
The bottom of the mounting bracket 16 may be fixedly disposed at the bottom of the switchgear cabinet. The mounting brackets 16 are two and are oppositely arranged, through holes are formed in the mounting brackets 16, the rotating shaft 12 is located between the two mounting brackets 16, and the two ends of the rotating shaft 12 penetrate out of the through holes in the two mounting brackets 16 respectively. The end part of the rotating shaft 12 is connected with the transmission connecting rod 11 through a first connecting crank arm 14, one end of the first connecting crank arm 14 is rotatably connected with the end part of the transmission connecting rod 11 through a pin shaft, and the other end of the first connecting crank arm is fixedly connected with the end part of the rotating shaft 12.
In this embodiment, the transmission link 11, the first connecting link 14, and the second connecting link 15 form a four-link structure. The four-bar linkage simple structure, the action is accurate, reliable, can effectually guarantee that supplementary earthing switch 1 and earthing switch 2 close a floodgate simultaneously for 3 both ends of fuse ground connection simultaneously, guarantee personnel's safety, avoid taking place to electrocute or be wounded by the residual charge among the operation process and lead to the electric accident.
When earthing switch 2 closes the floodgate and drives supplementary earthing switch 1 and close the floodgate, in order to avoid supplementary earthing switch 1 to damage supplementary earthing switch 1 because of earthing switch 2's overtravel, in this embodiment, still be equipped with spacing arch 161 on setting up the installing support 16, spacing arch 161 is used for the rotation range of spacing first connecting lever 14. The limiting protrusion 161 may be a screw fixedly installed on the mounting bracket 16, and when the first connecting crank arm 14 rotates to a position contacting with the screw, it is limited, and the auxiliary grounded rotating shaft 12 is effectively protected from rotating over-travel.
The utility model provides an auxiliary earthing switch 1 installs in the load side of fuse 3, auxiliary earthing switch 1 includes transmission connecting rod 11, axis of rotation 12, clamp plate subassembly 13. The transmission connecting rod 11 is used for connecting the grounding switch 2 of the fuse 3, and when the grounding switch 2 is switched on or switched off, the transmission connecting rod 11 can be driven to move; the transmission connecting rod 11 can synchronously drive the rotating shaft 12 to rotate when rotating, and the rotating shaft 12 further drives the pressing plate assembly 13 to rotate, so that the pressing plate assembly 13 is in contact with the static contact 17 of the auxiliary grounding switch 1. It can be understood that the stationary contact 17 is connected to the load side of the fuse 3, so that when the pressure plate assembly 13 is in contact with the stationary contact 17, the auxiliary grounding switch 1 is in a closed state, and the load side of the fuse 3 is grounded. The auxiliary grounding switch 1 of the utility model is in transmission connection with the grounding switch 1 and the rotating shaft 12 through the transmission connecting rod 11, so the structure is simple, and the grounding switch 2 and the auxiliary grounding switch 1 can be ensured to realize synchronous switching on and switching off; and the utility model discloses supplementary earthing switch 1 is knife switch formula rotating-structure, consequently has higher operational reliability.
Referring to fig. 2, the auxiliary grounding switch 1 of the present embodiment is a knife-switch rotating structure, and the rotating shaft 12 drives the pressing plate assembly 13 of the auxiliary grounding switch 1 to contact the stationary contact 17, so as to implement closing. In this embodiment, three sets of pressure plate assemblies 13 are mounted on the rotating shaft 12 to correspond to three-phase lines, respectively; the three sets of platen assemblies 13 are arranged in sequence along the length of the rotating shaft 12. Correspondingly, there are three stationary contacts 17. The position of the static contact 17 is arranged in one-to-one correspondence with the three sets of pressure plate assemblies 13, so that when the rotating shaft 12 rotates to the switching-on position, the three sets of pressure plate assemblies 13 can simultaneously contact the corresponding static contacts 17. The three sets of platen assemblies 13 have the same structure, and the structure of one set of platen assemblies 13 is described herein as an example.
In this embodiment, the pressing plate assembly 13 includes a first pressing plate 131, a second pressing plate 132 disposed oppositely, and an elastic member 133 connected between the first pressing plate 131 and the second pressing plate 132; the first pressing plate 131 is fixedly connected to the rotating shaft 12, and the second pressing plate 132 is used for contacting the stationary contact 17 to close the auxiliary grounding switch 1.
The second pressing plate 132 is equivalent to a movable contact of the auxiliary grounding switch 1. The fixed contact 17 of the auxiliary grounding switch 1 can be fixed on a conductive sleeve 4, the conductive sleeve 4 is connected to the load side of the fuse 3 through a wire, the fixed contact 17 is fixed in the switch cabinet, so the fixed contact 17 remains stationary, and the second pressing plate 132 can rotate to the position contacting with the fixed contact 17 under the rotation of the rotating shaft 12, so that the grounding switch is switched on.
The first pressing plate 131 can be fixed on the rotating shaft 12 by screws, so that the relative position of the first pressing plate 131 and the rotating shaft 12 is fixed; the first pressing plate 131 and the second pressing plate 132 are arranged substantially in parallel, and the elastic member 133 is arranged so that the second pressing plate 132 can adjust the relative distance with the first pressing plate 131 by compressing the elastic member 133. Therefore, when the auxiliary ground switch 1 is switched on, the second pressing plate 132 receives a reaction force of the stationary contact 17 after contacting the stationary contact 17, and at this time, if the rotating shaft 12 rotates continuously, so that the first pressing plate 131 continues to approach the stationary contact 17, the second pressing plate 132 compresses the elastic member 133 under the buffer of the elastic member 133, so as to avoid further pressing the stationary contact 17. The elastic member 133 limits the collision force between the second pressing plate 132 and the fixed contact 17, so as to achieve the soft contact between the second pressing plate 132 and the fixed contact 17, thereby effectively avoiding the damage to the fixed contact 17 and the second pressing plate 132 caused by the severe collision between the second pressing plate 132 and the fixed contact 17 when the closing speed of the second pressing plate 132 is too fast or the second pressing plate rotates in an over-travel manner, and ensuring the safety of the closing process.
Moreover, due to the reset elastic force action of the elastic member 133, after the second pressing plate 132 is contacted with the stationary contact 17, the second pressing plate 132 is subjected to the elastic force action of the elastic member 133 to maintain stable contact with the stationary contact 17, so that the reliability and stability of closing are ensured.
Therefore, the technical scheme of the embodiment not only ensures the reliability of closing, but also can improve the safety of closing.
In this embodiment, the pressing plate assembly 13 further comprises a flexible connecting arm 134, and the flexible connecting arm 134 is connected to the end portions of the first pressing plate 131 and the second pressing plate 132 which are located on the same side, so as to connect the first pressing plate 131 and the second pressing plate 132. The flexible connecting arms 134 serve to connect the first pressing plate 131 and the second pressing plate 132 on the one hand and to conduct electricity on the other hand. The two ends of the flexible connecting arm 134 are rigid to fix the positions of the first pressing plate 131 and the second pressing plate 132, and the middle section of the flexible connecting arm 134 is flexible to match the process of the second pressing plate 132 facing or away from the first pressing plate 131.
Specifically, the flexible connecting arm 134 is a flexible copper bar. One end of the flexible copper bar is fixedly connected with the end of the second pressing plate 132, and the other end of the flexible copper bar is fixedly connected with the first pressing plate 131 and the end of the rotating shaft 12 through screws.
The pressing plate assembly 13 further includes a lock bolt 135 and a lock nut 136, the lock bolt 135 sequentially penetrates through the first pressing plate 131 and the second pressing plate 132, and the lock nut 136 is fixed at an end of the lock nut 136. The position of the locknut 136 can be adjusted to adjust the maximum distance between the first and second pressing plates 131 and 132. The second presser plate 132 is along the shaft portion of the check bolt 135 to be close to or distant from the first presser plate 131. The lock bolt 135 and the lock nut 136 may be provided in two or more sets, which can enhance the structural strength of the pressing plate assembly 13, and can also make the movement stability of the second pressing plate 132 better.
In this embodiment, the elastic member 133 is a compression spring, and the compression spring is sleeved on the rod of the locking bolt 135. When there are two or more sets of the lockbolts 135 and locknuts 136, the compression spring may be provided to the shaft portion of one or more lockbolts 135.
Here, the moving path of the electric charges is explained after the second pressing plate 132 is contacted with the stationary contact 17. In this embodiment, the mounting bracket 16, the rotating shaft 12, the flexible connecting arm 134, and the second pressing plate 132 are made of a conductive material, such as metal. The mounting bracket 16 is grounded. Therefore, when the second pressing plate 132 contacts the fixed contact 17, the electric charges move to the mounting bracket 16 through the fixed contact 17, the second pressing plate 132, the flexible connecting arm 134 and the rotating shaft 12, thereby completing the grounding. This embodiment avoids as the ground connection conductor ground connection through bolt, little spring, has guaranteed auxiliary earthing switch 1's ground connection continuity.
In the above embodiment, the stationary contact 17 may be connected to the load side of the fuse 3 through the conductive sleeve 4. In this embodiment, the stationary contact 17 may be a screw to facilitate installation.
The auxiliary grounding switch 1 further comprises a shielding cover, and the shielding cover is covered outside the static contact 17. The shielding cover can effectively improve the electric field near the static contact 17, so that the electric field on the surface of the static contact 17 is balanced; the potential safety hazard caused by the point discharge phenomenon when the switch is closed because the surface of the static contact 17 has a sharp corner is avoided. And the arrangement of the shielding cover can also improve the voltage-resistant level of the static contact 17 and improve the grounding reliability of the auxiliary grounding switch 1.
The shielding cover is made of metal materials, and can also wrap the surface of the static contact 17 to improve the electric field near the static contact 17.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. An auxiliary grounding switch, wherein a stationary contact of the auxiliary grounding switch is located on a load side of a fuse, the auxiliary grounding switch comprising:
the transmission connecting rod is connected with a grounding switch of the fuse, and the transmission connecting rod can be driven to move when the grounding switch is switched on or switched off;
the rotating shaft is in transmission connection with the transmission connecting rod so as to drive the rotating shaft to rotate when the transmission connecting rod moves;
the pressure plate assembly is used for being in contact with the fixed contact so as to close the auxiliary grounding switch; the pressure plate assembly is installed on the rotating shaft and rotates to a position contacting with the fixed contact along with the rotating shaft when the grounding switch is switched on.
2. The auxiliary earthing switch according to claim 1, characterized in that said auxiliary earthing switch further comprises a first connecting crank arm and a mounting bracket;
one end of the transmission connecting rod is connected with an operating mechanism of the grounding switch or a working shaft of the grounding switch, the other end of the transmission connecting rod is rotatably connected with one end of the first connecting crank arm, and the other end of the first connecting crank arm is fixedly connected with the rotating shaft;
the rotating shaft is mounted on the mounting bracket.
3. The auxiliary earthing switch of claim 2, characterized in that a limiting protrusion is further provided on the mounting bracket, and the limiting protrusion is used for limiting the rotation range of the first connecting crank arm.
4. The auxiliary earthing switch according to any one of claims 1 to 3, characterized in that said pressure plate assembly comprises a first pressure plate, a second pressure plate, and an elastic member connected between said first pressure plate and said second pressure plate;
the first pressing plate is fixedly connected with the rotating shaft, and the second pressing plate is used for contacting the static contact to close the auxiliary grounding switch.
5. The auxiliary earthing switch according to claim 4, characterized in that said pressure plate assembly further comprises a flexible connecting arm connected to the end of said first and second pressure plates located on the same side to connect said first and second pressure plates.
6. The auxiliary earthing switch according to claim 5, characterized in that said flexible connecting arm is a soft copper bar.
7. The auxiliary earthing switch of claim 4, characterized in that the pressure plate assembly further comprises a lockbolt and a locknut, the lockbolt sequentially penetrates through the first pressure plate and the second pressure plate, and the locknut is fixed at the end of the locknut;
the elastic piece is a compression spring, and the compression spring is sleeved on the rod part of the anti-loosening bolt.
8. The auxiliary grounding switch of claim 1, wherein the stationary contact is a screw, and the screw is connected to a load side of the fuse through a conductive bushing;
the conductive sleeve is fixed on the cabinet body of the switch cabinet.
9. The auxiliary grounding switch of claim 1, wherein the auxiliary grounding switch further comprises a shielding cover, and the shielding cover is disposed outside the stationary contact.
10. A switchgear cabinet comprising a fuse, an earthing switch, and an auxiliary earthing switch according to any one of claims 1 to 9; the earthing switch is installed on a bus side of the fuse, and the auxiliary earthing switch is installed on a load side of the fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921399148.1U CN211150398U (en) | 2019-08-27 | 2019-08-27 | Auxiliary grounding switch and switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921399148.1U CN211150398U (en) | 2019-08-27 | 2019-08-27 | Auxiliary grounding switch and switch cabinet |
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| Publication Number | Publication Date |
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| CN211150398U true CN211150398U (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921399148.1U Active CN211150398U (en) | 2019-08-27 | 2019-08-27 | Auxiliary grounding switch and switch cabinet |
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| CN (1) | CN211150398U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110444434A (en) * | 2019-08-27 | 2019-11-12 | 厦门华电开关有限公司 | Auxiliary earth switch and switchgear |
-
2019
- 2019-08-27 CN CN201921399148.1U patent/CN211150398U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110444434A (en) * | 2019-08-27 | 2019-11-12 | 厦门华电开关有限公司 | Auxiliary earth switch and switchgear |
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