CN215266704U - Secondary quick-assembling grounding device of voltage transformer - Google Patents
Secondary quick-assembling grounding device of voltage transformer Download PDFInfo
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- CN215266704U CN215266704U CN202121481927.3U CN202121481927U CN215266704U CN 215266704 U CN215266704 U CN 215266704U CN 202121481927 U CN202121481927 U CN 202121481927U CN 215266704 U CN215266704 U CN 215266704U
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- 238000000034 method Methods 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 description 20
- 238000012423 maintenance Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 6
- 229910001369 Brass Inorganic materials 0.000 description 5
- 239000010951 brass Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a voltage transformer secondary fast-assembling earthing device, wherein, a voltage transformer secondary fast-assembling earthing device, include: the quick-mounting plug comprises an interface converter, a first quick-mounting plug, a second quick-mounting plug, a grounding wire and a grounding wire busbar socket; one end of the interface converter is connected with a secondary circuit breaker of the voltage transformer, and the other end of the interface converter is detachably connected with the first quick-assembling plug; one end of the grounding wire is connected with the first quick-mounting plug, and the other end of the grounding wire is connected with the second quick-mounting plug; the grounding wire busbar socket is installed on the grounding wire busbar, and the second quick-mounting plug is detachably connected with the grounding wire busbar socket. In order to solve in the past when carrying out substation equipment and overhauing, can't be fast effectively install the earth connection additional under the condition that does not destroy the circuit, and current install earth connection device additional need reform transform voltage transformer and just can connect the earth connection, just connect and dismantle too complicated problem of process.
Description
Technical Field
The utility model relates to an electric power tech field, a voltage transformer secondary fast-assembling earthing device specifically says so.
Background
In the process of transformer operation maintenance, the secondary side of the voltage transformer needs to be connected with a grounding wire, so that when the transformer operates, the secondary fuse or the air switch of the voltage transformer is not disconnected, the secondary voltage generated by the voltage transformer operates is reversely transmitted to maintenance equipment through a voltage loop after the secondary fuse or the air switch is parallel, namely, the secondary of the voltage transformer reversely charges once, the voltage transformer which is maintained is electrified, and the personal safety of maintenance personnel is endangered. When present transformer operation was overhauld, can't effectively install the earth connection additional to voltage transformer secondary side because on voltage transformer's secondary circuit breaker, do not have the position that can connect the earth connection on its upper and lower connecting wire, if will connect the earth connection and need peel off the insulating skin on the circuit about the circuit breaker and connect, nevertheless the operation can destroy the insulating effect of circuit like this, causes danger easily. The existing fixing device for the secondary ground wire of the voltage transformer needs to transform the current transformer in advance when in use, is complex and tedious in process when the ground wire is installed and disassembled, and cannot install the ground wire quickly and effectively.
Disclosure of Invention
In view of this, the utility model provides a voltage transformer secondary fast-assembling earthing device to solve in the past when carrying out transformer operation maintenance, can't be fast effectively install the earth connection additional under the condition that does not destroy to the circuit, and current install the earth connection device additional and need reform transform the voltage transformer and just can connect the earth connection, and connect and dismantle the too complicated problem of process.
The utility model provides a voltage transformer secondary fast-assembling earthing device, include: the quick-mounting plug comprises an interface converter, a first quick-mounting plug, a second quick-mounting plug, a grounding wire and a grounding wire busbar socket;
one end of the interface converter is connected with a secondary circuit breaker of the voltage transformer, and the other end of the interface converter is detachably connected with the first quick-assembling plug;
one end of the grounding wire is connected with the first quick-mounting plug, and the other end of the grounding wire is connected with the second quick-mounting plug;
the grounding wire busbar socket is installed on the grounding wire busbar, and the second quick-mounting plug is detachably connected with the grounding wire busbar socket.
Preferably, the interface converter includes: the first insulation socket and the connecting block;
the first insulation socket is hollow, one end of the first insulation socket is an opening, a first insulation layer is arranged on the outer portion of the first insulation socket close to one end of the opening, and the other end of the first insulation socket is connected with one end of the connecting block through a threaded structure;
the connecting block is connected with the secondary circuit breaker of the voltage transformer.
Preferably, the body of the connecting block is a cuboid, and one end of the connecting block is connected with the first insulating socket through a threaded structure;
and a protruding part is arranged on the side wall of the other end of the connecting block and connected with the secondary circuit breaker of the voltage transformer.
Preferably, the ground wire busbar socket includes: a second insulating socket and a nut;
the second insulating socket is hollow, one end of the second insulating socket is provided with an opening, and the other end of the second insulating socket is provided with an external thread;
the ground wire bus bar is provided with a mounting hole, and the other end of the second insulating socket penetrates through the mounting hole;
the two nuts are sleeved at the other end of the second insulating socket and are respectively positioned at the top and the bottom of the ground wire busbar, and the internal threads of the nuts are matched with the external threads at the other end of the second insulating socket;
and a second insulating layer is arranged on the outer wall of one end of the second insulating socket.
Preferably, the method further comprises the following steps: a height adjustment ring;
the height adjusting ring is sleeved on the second insulating socket and positioned between the second insulating layer and the nut.
Preferably, the side walls of the first quick-assembly plug and the second quick-assembly plug are respectively provided with an arc-shaped bulge.
The utility model discloses following beneficial effect has:
the utility model provides a voltage transformer secondary fast-assembling earthing device installs the interface converter on voltage transformer secondary circuit breaker through the setting, cooperate with fast-assembling plug, insulating socket and realize high-speed joint or disconnection, solved in the past when carrying out transformer operation maintenance, can't be fast effectively install the earth connection additional under the condition that does not destroy to the circuit, and current install the earth connection device additional and need reform transform voltage transformer and just can connect the earth connection, and connect and dismantle the too complicated problem of process.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is the utility model discloses a voltage transformer secondary fast-assembling earthing device's schematic structure.
Fig. 2 is a cross-sectional view of an interface converter according to an embodiment of the present invention.
Fig. 3 is a sectional view of the female socket of earth connection in the embodiment of the present invention.
In the figure, 1-first quick-assembly plug, 2-grounding wire, 3-grounding wire bus bar, 4-first insulation socket, 5-connecting block, 6-protrusion, 7-second quick-assembly plug, 9-voltage transformer secondary breaker, 10-wire inlet slot, 11-power wire, 12-first insulation layer, 13-second insulation socket, 14-second insulation layer, 15-nut, 16-height adjusting ring, 17-gasket.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. However, for parts not described in detail, those skilled in the art can fully understand the present invention.
Furthermore, those skilled in the art will appreciate that the drawings are provided for purposes of illustrating the objects, features, and advantages of the invention and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Fig. 1 is the utility model discloses a voltage transformer secondary fast-assembling earthing device's schematic structure. Fig. 2 is a cross-sectional view of an interface converter according to an embodiment of the present invention. Fig. 3 is a sectional view of the female socket of earth connection in the embodiment of the present invention. As shown in fig. 1, fig. 2 and fig. 3, a secondary quick-assembly grounding device for a voltage transformer comprises: the quick-mounting plug comprises an interface converter, a first quick-mounting plug 1, a second quick-mounting plug 7, a grounding wire 2 and a grounding wire busbar socket; one end of the interface converter is connected with a secondary circuit breaker 9 of the voltage transformer, and the other end of the interface converter is detachably connected with the first quick-assembling plug 1; one end of the grounding wire 2 is connected with the first quick-mounting plug 1, and the other end is connected with the second quick-mounting plug 7; the grounding wire busbar socket is arranged on the grounding wire busbar 3, and the second quick-mounting plug 7 is detachably connected with the grounding wire busbar socket.
The embodiment of the utility model provides an in, interface converter is used for making first fast-assembling plug 1 and voltage transformer be connected secondary circuit breaker. When the voltage transformer secondary circuit breaker is installed, the voltage transformer secondary circuit breaker 9 is detached, the top screw is unscrewed, then one end of the interface converter is inserted into the wire inlet slot 10 at the top of the secondary circuit breaker, the power wire 11 inside the wire inlet slot 10 is connected to the rear part of the interface converter in the wire inlet slot 10, the screw is fixed again, and finally the secondary circuit breaker is installed and fixed on the voltage transformer again. And mounting the grounding wire busbar socket on the grounding wire busbar 3. When the quick-mounting plug is used, the first quick-mounting plug 1 is connected with the interface converter, and then the second quick-mounting plug 7 is connected with the grounding wire busbar socket, so that the grounding wire 2 is connected.
In the present invention, as shown in fig. 1 and 2, the interface converter includes: a first insulating socket 4 and a connection block 5; the first insulation socket 4 is hollow, one end of the first insulation socket is open, a first insulation layer 12 is arranged on the outer portion of the first insulation socket 4 close to one end of the open end, and the other end of the first insulation socket 4 is connected with one end of the connecting block 5 through a threaded structure; the connecting block 5 is connected with a secondary circuit breaker 9 of the voltage transformer.
In the embodiment of the present invention, the connecting block 5 is made of brass. The body of first insulation socket 4 is the cylinder, and the material is the brass, the outside parcel insulating rubber of one end. When the installation, inside inlet wire slot 10 on the voltage transformer secondary circuit breaker 9 was inserted to the one end of connecting block 5, was connected with the contact inside inlet wire slot 10 to make first insulating socket 4 be connected with voltage transformer secondary circuit breaker 9 through connecting block 5. When the quick-assembly plug is used, the first quick-assembly plug 1 is inserted into the first quick-assembly plug from an opening at one end of the first insulating socket 4, the second quick-assembly plug 7 is connected with a grounding wire busbar socket, and at the moment, the voltage transformer secondary circuit breaker 9 is connected with the grounding wire busbar 3 through the connecting block 5, the first insulating socket 4, the first quick-assembly plug 1, the grounding wire 2, the second quick-assembly plug 7 and the grounding wire busbar socket. When the ground wire connection is needed each time, the first quick-assembling plug 1 is plugged into and pulled out of the first insulating socket 4 to realize quick connection or disconnection. After frequently using a period of time, can changing first insulating socket 4, because first insulating socket 4 is threaded connection with connecting block 5, only need to rotate first insulating socket 4 and unscrew and can change when changing, first insulating layer 12 has in the outside of first insulating socket 4, can prevent that operating personnel from electrocuting when changing.
In the utility model and fig. 1, the body of the connecting block 5 is a cuboid, and one end of the connecting block 5 is connected with the first insulating socket 4 through a thread structure; and a protruding part 6 is arranged on the side wall at the other end of the connecting block 5, and the protruding part 6 is connected with a secondary circuit breaker 9 of the voltage transformer.
In the embodiment of the present invention, the protruding portion 6 is a cuboid, and is perpendicular to the side wall of the connecting block 5. When the secondary breaker is installed, the protruding part 6 is inserted into the inlet slot 10 of the secondary breaker, so that the protruding part is in contact connection with the contacts in the inlet slot 10. When the quick-mounting plug is used, the first quick-mounting plug 1 is connected with the first insulating socket 4, the second quick-mounting plug 7 is connected with the grounding wire busbar socket, and then the secondary grounding wire 2 of the voltage transformer is connected. In equipment terminal box, need hold the secondary wiring because of voltage transformer secondary circuit breaker 9's top, lead to the space less, if set up the interface converter to the vertical direction and place, connect first fast-assembling plug 1, then can cross in narrowly and cause the operation inconvenience because of the top space. Set up connecting block 5 horizontal placement, insert inlet wire slot 10 inside through set up protruding portion 6 on its lateral wall and connect for first fast-assembling plug 1 can be followed the front and inserted, has made things convenient for operating personnel high-speed joint.
In the present invention, fig. 1 and 3, the ground wire female socket includes: a second insulating socket 13 and a nut 15; the second insulating socket 13 is hollow, one end of the second insulating socket is open, and the other end of the second insulating socket is provided with external threads; the ground wire busbar 3 is provided with a mounting hole, and the other end of the second insulating socket 13 penetrates through the mounting hole; two nuts 15 are sleeved at the other end of the second insulating socket 13 and are respectively positioned at the top and the bottom of the ground wire busbar 3, and the internal thread of each nut 15 is matched with the external thread at the other end of the second insulating socket 13; the second insulating socket 13 has a second insulating layer 14 on an outer wall at one end thereof.
In the embodiment of the present invention, the body of the second insulating socket 13 is a cylinder, and the material is brass. When the grounding wire bus bar is installed, one of the two nuts 15 is sleeved outside the second insulating socket 13 through screw thread matching, the position is close to the second insulating layer 14, then the other end of the second insulating socket 13 is inserted into the installation hole of the grounding wire bus bar 3, the other end of the second insulating socket 13 penetrates through the installation hole, then another nut 15 is sleeved at the other end of the second insulating socket 13 in a threaded fit manner, at the moment, the two nuts 15 are arranged on the second insulating socket 13 and positioned at the top and the bottom of the ground wire busbar 3, the nut 15 positioned at the top of the ground wire busbar 3 is screwed downwards, the nut 15 positioned at the bottom of the ground wire busbar 3 is screwed upwards, the two nuts 15 gradually approach to clamp the ground wire busbar 3, and thus the second insulating socket 13 is fixed on the ground wire busbar 3, wherein, still install gasket 17 respectively between two nuts 15 and the female 3 of ground wire, gasket 17 is used for preventing that nut 15 is not hard up. When the quick-mounting plug is used, the second quick-mounting plug 7 is inserted into the second quick-mounting plug from an opening at one end of the second insulating socket 13, and in the mounting hole, the side wall of the second insulating socket 13 is in contact with the ground wire busbar 3, so that the ground wire 2 is connected with the ground wire busbar 3 through the second quick-mounting plug 7 and the second insulating socket 13. The second insulating layer 14 is used for when needing to change second insulating socket 13, can dismantle fast through rotating second insulating socket 13 one end, and the isolated electric current of second insulating layer 14 prevents that operating personnel from electrocuteeing.
The utility model discloses and in fig. 1, still include: a height adjustment ring 16; the height adjusting ring 16 is sleeved on the second insulating socket 13 and positioned between the second insulating layer 14 and the nut 15
The embodiment of the utility model provides an in, when second insulating socket 13 is connected with female 3 of arranging of ground wire, because the female thickness of arranging 3 of ground wire is different, when connecting female 3 of arranging of thinner ground wire, second insulating socket 13 is after inserting the mounting hole, and it is too much that its other end may stretch out female 3 bottoms of arranging of ground wire, and when operating personnel operated, other part or circuit can be scraped to too much outstanding part, hinder the installation or carry out other operations. On the second insulating socket 13, one or more height adjusting rings 16 are sleeved between the second insulating layer 14 and the nut 15 on the top of the ground wire busbar 3 to adjust the length of the other end of the second insulating socket 13 extending out of the bottom of the ground wire busbar 3, so that the second insulating socket 13 is prevented from extending out of the bottom of the ground wire busbar 3 too much, or the nut 15 on the top of the ground wire busbar 3 on the second insulating socket 13 is too far away from the second insulating layer 14, so that the problem of looseness is easily caused during long-term use.
In the present invention and fig. 1, the side walls of the first quick-assembly plug 1 and the second quick-assembly plug 7 are respectively provided with arc-shaped protrusions.
In the embodiment of the present invention, the first quick-mounting plug 1 and the second quick-mounting plug 7 are made of brass. The middle position is set to be a structure with arc-shaped bulges on the side walls of the first quick-assembly plug 1 and the second quick-assembly plug 7, the space between the inside of the arc-shaped bulge and the side walls of the first quick-assembly plug 1 is hollow, certain elasticity is realized because the arc-shaped bulge is made of brass material, the opening diameter of the first insulation socket 4 is slightly smaller than the diameter of the arc-shaped bulge of the first quick-assembly plug 1, when the first quick-assembly plug 1 is inserted into the first insulation socket 4, the arc-shaped bulge is inwards compressed, and the first quick-assembly plug 1 is more tightly attached to the inner wall of the first insulation socket 4 because of the elasticity, so that the first quick-assembly plug 1 is more tightly connected with the first insulation socket 4. The structure of the second quick-assembly plug 7 is the same as that of the first quick-assembly plug 1, the diameter of the inner part of the second insulating socket 13 is slightly smaller than that of the arc-shaped bulge part of the second quick-assembly plug 7, and when the second quick-assembly plug 7 is inserted into the second insulating socket 13, the arc-shaped bulge part is tightly attached to the inner wall of the second insulating socket 13. The arc-shaped protruding structures are arranged on the side walls of the first quick-assembly plug 1 and the second quick-assembly plug 7, so that the first quick-assembly plug 1 and the second quick-assembly plug 7 are connected with the first insulating socket 4 and the second insulating socket 13 more tightly, and are prevented from being separated easily during use.
The embodiment of the utility model provides an in, when the installation, lift voltage transformer secondary circuit breaker 9 off, unscrew the top screw, then insert inlet wire slot 10 with the protruding portion 6 of interface converter connecting block 5 inside, make the contact in protruding portion 6 and the inlet wire slot 10 be connected, be connected to inlet wire slot 10 inside power cord 11 at inlet wire slot 10 inside rear of interface converter, it is fixed to screw up again, installs the normal position with voltage transformer secondary circuit breaker 9 at last.
According to the thickness of the ground wire busbar 3, one or more height adjusting rings 16 are sleeved on a second insulating socket 13, then one of two nuts 15 is sleeved on the second insulating socket 13 and positioned below the height adjusting rings 16, the other end of the second insulating socket 13 penetrates through a mounting hole of the ground wire busbar 3, the other nut 15 is sleeved on the other end of the second insulating socket 13, the two nuts 15 are screwed up relatively to clamp the ground wire busbar 3, and therefore the second insulating socket 13 and the ground wire busbar 3 are fixed.
When the quick-assembly plug is used, the first quick-assembly plug 1 is inserted into the first insulating socket 4, the second quick-assembly plug 7 is inserted into the second insulating socket 13, at the moment, the voltage transformer secondary circuit breaker 9 completes connection of the grounding wire 2 through the protruding portion 6, the connecting block 5, the first insulating socket 4, the first quick-assembly plug 1, the grounding wire 2, the second quick-assembly plug 7 and the second insulating socket 13, and an operator can start maintenance work.
The utility model discloses can be quick effectual completion voltage transformer install secondary earth connection 2 additional fast, the seventh subentry clearly points out the regulation that prevents the voltage transformer secondary from going on once to anti-charging in completely conforming to "state net black dragon river province electric power limited company electric operation ticket management implementation scheme" to and satisfy "national electric wire netting company electric power safety multiplexer utensil management regulation national electric wire netting tongue-and-groove management [ 2014 ] 748" individual protective equipment test project, cycle and requirement: group direct current resistance test: the cross section area is 26-10 mm, and the average resistance value m omega per meter is less than or equal to 1.9.
The utility model has low manufacturing cost and simple installation, and does not need to carry out complex modification on the voltage transformer; convenient to use has avoidd a lot of loaded down with trivial details operations, perfect solution the electric power enterprise can't install the difficult problem of earth connection 2 additional at the voltage transformer secondary, avoided probably bringing the danger of bodily injury to the maintenance test personnel because of can't installing earth connection 2 additional. When not using voltage transformer secondary fast-assembling earthing device, earth connection 2 and first fast-assembling plug 1 and second fast-assembling plug 7 can place in the multiplexer utensil room, when maintenance work relates to doing the ground connection, operating personnel firmly inserts the first fast-assembling plug 1 and the 7 ends of second fast-assembling plug of earth connection 2 both ends earlier, and whole ground connection can be accomplished, and is simple and convenient swift, has shortened the time of transformer operation.
The above embodiments are merely embodiments for expressing the invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, substitutions, modifications, etc. can be made without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. The utility model provides a voltage transformer secondary fast-assembling earthing device which characterized in that includes: the quick-mounting type ground wire connector comprises an interface converter, a first quick-mounting plug (1), a second quick-mounting plug (7), a ground wire (2) and a ground wire busbar socket;
one end of the interface converter is connected with a secondary circuit breaker (9) of a voltage transformer, and the other end of the interface converter is detachably connected with the first quick-assembling plug (1);
one end of the grounding wire (2) is connected with the first quick-mounting plug (1), and the other end of the grounding wire is connected with the second quick-mounting plug (7);
the grounding wire busbar socket is installed on a grounding wire busbar (3), and the second quick-assembling plug (7) is detachably connected with the grounding wire busbar socket.
2. The secondary quick grounding device of a voltage transformer as claimed in claim 1, wherein said interface converter comprises: a first insulating socket (4) and a connecting block (5);
the interior of the first insulating socket (4) is hollow, one end of the first insulating socket is an opening, a first insulating layer (12) is arranged on the outer portion of one end, close to the opening, of the first insulating socket (4), and the other end of the first insulating socket (4) is connected with one end of the connecting block (5) through a threaded structure;
and the connecting block (5) is connected with the secondary circuit breaker (9) of the voltage transformer.
3. The secondary quick-assembly grounding device of the voltage transformer as claimed in claim 2, wherein:
the body of the connecting block (5) is a cuboid, and one end of the connecting block (5) is connected with the first insulating socket (4) through a threaded structure;
the side wall of the other end of the connecting block (5) is provided with a protruding part (6), and the protruding part (6) is connected with the secondary circuit breaker (9) of the voltage transformer.
4. The secondary quick-assembly grounding device of the voltage transformer as claimed in any one of claims 1 to 3, wherein the grounding wire busbar socket comprises: a second insulating socket (13) and a nut (15);
the second insulating socket (13) is hollow, one end of the second insulating socket is provided with an opening, and the other end of the second insulating socket is provided with an external thread;
the ground wire busbar (3) is provided with a mounting hole, and the other end of the second insulating socket (13) penetrates through the mounting hole;
the two nuts (15) are sleeved at the other end of the second insulating socket (13) and are respectively positioned at the top and the bottom of the ground wire busbar (3), and the internal threads of the nuts (15) are matched with the external threads at the other end of the second insulating socket (13);
and a second insulating layer (14) is arranged on the outer wall of one end of the second insulating socket (13).
5. The secondary quick grounding device of the voltage transformer as claimed in claim 4, further comprising: a height adjustment ring (16);
the height adjusting ring (16) is sleeved on the second insulating socket (13) and is positioned between the second insulating layer (14) and the nut (15).
6. The secondary quick-assembly grounding device of the voltage transformer as claimed in any one of claims 1 to 3 and 5, wherein:
arc-shaped bulges are respectively arranged on the side walls of the first quick-assembly plug (1) and the second quick-assembly plug (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121481927.3U CN215266704U (en) | 2021-07-01 | 2021-07-01 | Secondary quick-assembling grounding device of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121481927.3U CN215266704U (en) | 2021-07-01 | 2021-07-01 | Secondary quick-assembling grounding device of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215266704U true CN215266704U (en) | 2021-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121481927.3U Active CN215266704U (en) | 2021-07-01 | 2021-07-01 | Secondary quick-assembling grounding device of voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215266704U (en) |
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2021
- 2021-07-01 CN CN202121481927.3U patent/CN215266704U/en active Active
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