CN210926855U - Gas-insulated metal-enclosed neutral point complete device - Google Patents
Gas-insulated metal-enclosed neutral point complete device Download PDFInfo
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- CN210926855U CN210926855U CN201921554314.0U CN201921554314U CN210926855U CN 210926855 U CN210926855 U CN 210926855U CN 201921554314 U CN201921554314 U CN 201921554314U CN 210926855 U CN210926855 U CN 210926855U
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 98
- 239000004020 conductor Substances 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 19
- 238000009413 insulation Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims 1
- 238000002955 isolation Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model relates to a gas insulated metal enclosed neutral point complete equipment. A gas insulated metal enclosed neutral point complete device is characterized in that a lightning arrester and an isolating switch are both of enclosed structures and are both vertically arranged; the top of one of the lightning arrester and the isolating switch is provided with a wire inlet cylinder, and the top of the other one of the lightning arrester and the isolating switch is provided with a switching cylinder; a middle cylinder is arranged between the wire inlet cylinder and the switching cylinder, a middle conductor is arranged in the middle cylinder, a switching conductor is arranged in the switching cylinder, and the middle conductor is connected with a top conductive terminal on a lightning arrester or an isolating switch below the switching cylinder through the switching conductor; the neutral point connecting side of the discharge gap is fixed at the top of the wire inlet cylinder, the grounding side of the discharge gap is in conductive connection with the adapter cylinder or is provided with a grounding connecting end, and a branch conductive structure is arranged in the wire inlet cylinder. Above-mentioned scheme has solved current closed neutral point complete sets and has need set up more air chamber, and the structure is comparatively complicated, problem with high costs.
Description
Technical Field
The utility model relates to a gas insulated metal enclosed neutral point complete equipment.
Background
The neutral point complete equipment is also called transformer neutral point complete equipment, neutral point gap protection complete equipment, transformer neutral point gap grounding protection equipment, gap protection and the like, and is mainly used for neutral point overvoltage protection of a power grid system. The neutral point complete device can realize two different operation modes of grounding operation or non-grounding operation of the neutral point of the transformer in the power system, thereby avoiding damage to the transformer caused by the increase of the voltage of the neutral point of the transformer due to lightning or system faults.
The existing typical neutral point complete equipment, such as a transformer neutral point gap grounding protection device disclosed in chinese patent with publication number CN205389099U and publication number 2016.07.20, includes a base, an isolating switch, an arrester, a discharge gap, etc., wherein a transformer neutral point lead terminal is connected with a transformer neutral point and then divided into three paths, namely, the isolating switch, the arrester and the discharge gap. The neutral point complete equipment is of an open structure, and a porcelain sleeve is used as an equipment shell and external insulation, so that the equipment is easily influenced by weather environment conditions due to a plurality of exposed parts, and the safe and reliable operation of the system is not facilitated.
There are also prior art neutral points that use closed structuresComplete equipment, for example, SF disclosed in Chinese patent application with application publication No. CN108512107A and application publication No. 2018.09.076Carry out insulating interchange neutral point complete set GIS device, with discharge gap, isolator, arrester setting in corresponding air chamber jar, can avoid polluting, reduce the space and occupy, increase life. Similar structure is disclosed in Chinese patent with publication number CN205029338U and publication date 2016.02.10.
However, the existing closed type neutral point complete equipment needs to be provided with more air chambers, the structure is more complex, the cost is high, and the sealing points are more, so that the reliability of the equipment is influenced. Meanwhile, the existing closed type neutral point complete equipment is grounded at the wire inlet end of the cable, and the wiring mode is single and cannot be suitable for overhead line connection.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gas insulated metal seals neutral point integrated equipment solves current closed neutral point integrated equipment and need set up more air chamber, and the structure is comparatively complicated, problem with high costs.
The technical proposal adopted in the utility model is as follows.
A gas insulated metal enclosed neutral point complete device comprises a lightning arrester, an isolating switch and a discharge gap; the discharge gap comprises a neutral point connecting side and a grounding side, the neutral point connecting side is used for being conducted with a neutral point of the transformer, and the grounding side is used for being grounded;
the lightning arrester and the isolating switch are both of a closed structure and are vertically arranged, the top parts of the lightning arrester and the isolating switch are provided with top conductive terminals, and the bottom parts of the lightning arrester and the isolating switch are provided with grounding terminals;
the top of one of the lightning arrester and the isolating switch is provided with a wire inlet cylinder, the top of the other one of the lightning arrester and the isolating switch is provided with a switching cylinder, and a middle cylinder is arranged between the wire inlet cylinder and the switching cylinder;
a middle conductor is arranged in the middle cylinder, a switching conductor is arranged in the switching cylinder, and the middle conductor is connected with a top conductive terminal on a lightning arrester or an isolating switch below the switching cylinder through the switching conductor;
the neutral point connecting side of the discharge gap is fixed at the top of the wire inlet cylinder, the grounding side of the discharge gap is electrically connected with the adapter cylinder or provided with a grounding connecting end, and the neutral point connecting side and the grounding side of the discharge gap are both exposed in the air;
a branch conductive structure is arranged in the wire inlet cylinder and is simultaneously conducted with a top conductive terminal on the lightning arrester or the isolating switch below the wire inlet cylinder, a corresponding end of the middle conductor and a neutral point connecting side of the lightning arrester;
the wire inlet cylinder is further provided with a wire inlet terminal used for being conducted with the branch conductive structure, and/or a wire inlet terminal used for being conducted with a neutral point of the transformer is arranged on the neutral point connecting side of the discharge gap.
Has the advantages that: adopt above-mentioned scheme, through setting up the inlet wire barrel, switching barrel and middle barrel, the structure homoenergetic except that discharge gap of gas-insulated metal seals neutral point integrated equipment can form closed structure, the neutral conductor and the switching conductor can guarantee being connected of arrester and isolator and the neutral point of transformer, and then can guarantee the security performance under the condition that satisfies the functional requirement, reduce the space and occupy, simultaneously, arrester and isolator can regard as the support base of the neutral point connection side of discharge gap and ground connection side, compared with the prior art, need not set up solitary discharge gap and support the base, also need not set up more barrel, moreover, the steam generator is simple in structure, and the cost reduction is facilitated.
As a preferred technical scheme, one end of the middle cylinder body, which is close to the wire inlet cylinder body, is provided with a wire inlet side insulating basin, and the wire inlet side insulating basin is used for isolating the middle cylinder body from the wire inlet cylinder body.
Has the advantages that: the isolation of corresponding compartments can be realized by arranging the wire inlet side insulation basin, the reliability is improved, and the connection and maintenance of wire inlet are facilitated.
As a preferred technical scheme, the branch conducting structure is formed by a cross joint, one end of the cross joint is fixed on the incoming line side insulating basin, and the other three ends are provided with inserting conducting structures.
Has the advantages that: the structure of the cross joint is simple and convenient to fix.
As a preferred technical scheme, the cross joint is provided with a blind hole extending along the axial direction of the wire inlet side insulation basin, and the bottom wall of the blind hole is fixed on the wire inlet side insulation basin through a screw.
Has the advantages that: by adopting the fixing structure, the reliable fixation of the cross joint can be ensured, and meanwhile, the conduction of the cross joint and the middle conductor is convenient to realize.
As a preferred technical scheme, one end of the middle cylinder body, which is close to the switching cylinder body, is provided with a switching side insulating basin, and the switching side insulating basin is used for isolating the middle cylinder body from the switching cylinder body.
Has the advantages that: the insulation basin at the switching side is arranged, so that the isolation of the corresponding compartments can be realized, and the reliability is improved.
As a preferred technical scheme, a switch side insulating basin is arranged between the switching cylinder and the isolating switch, and the switching side insulating basin is used for isolating the switching cylinder from the isolating switch.
Has the advantages that: the isolation of the corresponding compartments can be realized by arranging the switch side insulating basin, and the reliability is improved.
As a preferred technical solution, the gas-insulated metal-enclosed neutral point complete set includes a zero-sequence current transformer, and the zero-sequence current transformer is sleeved on the grounding side of the discharge gap.
Has the advantages that: by adopting the scheme, the fixation of the zero sequence current transformer can be conveniently realized, and the maintenance is convenient.
Preferably, a neutral point lead terminal is provided at a tip of the discharge gap on the neutral point connection side, and the neutral point lead terminal is electrically connected to the neutral point lead terminal.
Has the advantages that: the arrangement of the neutral point lead terminal can meet the wiring requirement of the overhead line, and the applicability is improved.
As a preferred technical scheme, the wire inlet terminal arranged on the wire inlet cylinder body is a plug-in cable terminal.
Has the advantages that: the plug-in cable terminal makes the installation of equipment and cable system separate completely, when the cable is experimental, overhauls, can directly extract the cable terminal head, convenient high efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the gas insulated metal enclosed neutral point kit of the present invention;
FIG. 2 is a schematic view of the internal structure of FIG. 1;
FIG. 3 is a schematic diagram of the circuit of FIG. 2;
FIG. 4 is an enlarged view of a portion of the branched conductive structure of FIG. 2;
FIG. 5 is an enlarged view of a portion of FIG. 2 at the junction conductor;
FIG. 6 is a schematic view of the gas insulated metal enclosed neutral point kit of FIG. 1 in use with a cable connection;
fig. 7 is a schematic view showing a state of use of the gas-insulated metal-enclosed neutral point plant of fig. 1 connected by an overhead line.
The names of the components corresponding to the corresponding reference numerals in the drawings are: 1-base, 2-lightning arrester, 3-isolating switch, 4-incoming line cylinder, 51-middle cylinder, 52-middle conductor, 61-switching cylinder, 62-switching conductor, 70-discharge gap, 71-neutral point connecting side, 72-grounding side, 8-neutral point lead terminal, 91-incoming line side insulating basin, 92-switching side insulating basin, 93-switch side insulating basin, 10-cross joint, 11-blind hole, 12-plug type cable terminal, 13-terminal socket, 14-transformer, 15-cable, 16-overhead line and 17-zero sequence current transformer.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
The utility model discloses an embodiment of well gas-insulated metal-enclosed neutral point integrated equipment is shown in fig. 1 and fig. 2, including base 1, arrester 2, isolator 3, inlet cylinder 4, middle barrel 51, switching barrel 61 and discharge gap 70. The lightning arrester 2 and the isolating switch 3 are both of a closed structure and are vertically arranged, top conductive terminals are arranged at the tops of the lightning arrester and the isolating switch, and grounding terminals are arranged at the bottoms of the lightning arrester and the isolating switch. The wire inlet cylinder 4 is of a cross structure and is fixed at the upper end of the lightning arrester 2, the switching cylinder 61 is of a three-way structure and is fixed at the upper end of the isolating switch 3, and the middle cylinder 51 is connected between the wire inlet cylinder 4 and the switching cylinder 61. As shown in fig. 2 and 3, the arrester 2, the discharge gap 70 and the isolating switch 3 are arranged in parallel, the isolating switch 3 is used for realizing direct grounding and isolation of a neutral point, switching on and off can be manually or automatically performed, and the arrester 2 and the discharge gap 70 can normally work during switching off.
As shown in fig. 1 and 2, the discharge gap 70 is a rod-shaped gap including a neutral point connection side 71 and a ground side 72, both the neutral point connection side 71 and the ground side 72 being exposed to the air. The neutral point connection side 71 includes an insulating support and a discharge rod fixed to the top end of the insulating support. The top end of the insulating support is also provided with a neutral point lead terminal 8, and the neutral point lead terminal 8 is used for conducting connection of the neutral point lead. The structure of the discharge gap 70 and the neutral point lead terminal 8 are both prior art and will not be described in detail herein. Of course, the discharge gap 70 may be a spherical gap in other embodiments. The gas insulated metal-enclosed neutral point complete equipment further comprises a zero sequence current transformer 17, wherein the zero sequence current transformer 17 is sleeved on the grounding side 72 of the discharge gap 70 and is used for recording the neutral point zero sequence current and the waveform of the discharge current of the discharge gap so as to analyze the fault.
As shown in fig. 2 and 4, a wire inlet side insulating basin 91 is disposed at one end of the middle cylinder 51 close to the wire inlet cylinder 4, and the wire inlet side insulating basin 91 is used for isolating the middle cylinder 51 from the wire inlet cylinder 4. A switch-side insulating basin 93 is arranged between the switching cylinder 61 and the isolating switch, and the switching-side insulating basin 92 is used for isolating the switching cylinder 61 from the isolating switch.
The middle cylinder 51 is internally provided with a middle conductor 52, the switching cylinder 61 is internally provided with a switching conductor 62, and the middle conductor 52 is connected with a top conductive terminal on the lightning arrester 2 or the isolating switch 3 below the switching cylinder 61 through the switching conductor 62. The intermediate conductor 52 has a straight-line structure, and the via conductor 62 has an L-shaped structure. In the direction shown in fig. 2, the left end of the intermediate conductor 52 is inserted into the insertion seat of the intermediate conductor 52 provided on the incoming line side insulation basin 91, the right end is inserted into the switching conductor 62, and the lower end of the switching conductor 62 is fixed on the switch side insulation basin 93.
As shown in fig. 2, 4 and 5, a branch conductive structure is arranged in the wire inlet cylinder 4, the branch conductive structure is formed by a cross joint 10, a blind hole 11 extending along the axial direction of the wire inlet side insulation basin 91 is arranged on the cross joint 10, and the bottom wall of the blind hole 11 is fixed on the wire inlet side insulation basin 91 through a screw and is conducted with the middle conductor socket through a conductive insert on the wire inlet side insulation basin 91. The other three ends of the cross joint 10 are provided with plug-in conductive structures, which are plug-in holes, and are respectively conducted with the incoming line terminal arranged on the incoming line barrel 4, the top conductive terminal on the lightning arrester 2 below the incoming line barrel 4, and the neutral point connection side 71 of the lightning arrester 2. One end of the wire inlet cylinder 4 far away from the middle cylinder 51 is provided with a plug-in cable terminal 12 for conducting a neutral point cable with a connector, and the other end of the neutral point cable is used for being connected with a neutral point of a transformer. The inner end of the plug-in cable terminal 12 is provided with a terminal plug socket 13, the terminal plug socket 13 is conducted with the plug socket at the left end of the cross joint 10 through a terminal connecting conductor, and further the neutral point of the transformer is conducted with the lightning arrester 2, the discharge gap 70 and the isolating switch 3. Of course, as a conventional technical means in the field, the plugging conductive structure is conducted with the corresponding plug through the conductive contact finger.
After the gas insulated metal closed neutral point complete equipment is assembled, sulfur hexafluoride gas is filled into each cylinder to realize insulation, the grounding terminals at the bottoms of the lightning arrester 2 and the isolating switch 3 are led to the main grounding grid for grounding through the base 1 or are led to the main grounding grid for grounding through a grounding bar, and the grounding side 72 of the discharge gap 70 is led to the main grounding grid for grounding through the adapter cylinder 61, the cylinder of the isolating switch 3 or the grounding bar led out from the grounding connecting end. When connected to the transformer 14, the gas-insulated metal-enclosed neutral point kit may be connected to the neutral point of the transformer 14 using a cable 15 as shown in fig. 6, or the gas-insulated metal-enclosed neutral point kit may be connected to the neutral point of the transformer 14 using an overhead wire 16 as shown in fig. 7.
During operation, the disconnector 3 is normally in the off position. When the lightning overvoltage and the general operation overvoltage invade, the lightning arrester 2 acts to absorb and release the overvoltage quantity, and the neutral point insulation of the transformer is protected from being damaged, and the discharge gap 70 cannot be broken down under the condition. When transient overvoltage such as ferromagnetic resonance, high-frequency resonance and the like occurs in the system, the discharge gap 70 breaks down to discharge, the overvoltage is completely dropped on the gap, the overvoltage energy is released into the ground, the neutral point of the transformer is instantaneously grounded to operate, the continuous development of accidents is prevented, and the lightning arrester 2 is protected from thermal breakdown accidents. According to the requirement, the isolating switch 3 can be manually or automatically switched on, and the requirement of direct grounding is met.
In the above embodiment, the wire inlet barrel 4 is disposed on the top of the lightning arrester 2, and the adapter barrel 61 is disposed on the top of the disconnector 3, but in other embodiments, the wire inlet barrel 4 may be disposed on the top of the disconnector 3, and the adapter barrel 61 may be disposed on the top of the lightning arrester 2.
In the above embodiments, the branch conductive structure is a cross structure with three ends provided with sockets, in other embodiments, each connection end of the branch conductive structure may adopt a screw fixing structure, and at this time, a hand hole may be provided on the wire inlet barrel 4 for assembly and disassembly operations, which is a conventional technical means in the art and will not be described in detail herein.
In the above embodiments, the cylinders are isolated from each other by the corresponding insulating basins, and in other embodiments, the cylinders may be provided as air chambers communicated with each other, for example, by using a communication type insulating basin, or by using an insulating basin provided with a communication valve, for example, to selectively communicate two adjacent compartments or isolate two adjacent compartments as required. The structures of the insulating basins are all the prior art, and are not described in detail here. In addition, in other embodiments, a switching-side insulating basin may be disposed at an end of the middle cylinder 51 close to the switching cylinder 61, and the switching-side insulating basin is used to isolate the middle cylinder 51 from the switching cylinder 61, and at this time, the right end of the middle conductor 52 and the left end of the switching conductor 62 may be connected to the conductive insert at the center of the switching-side insulating basin.
In the above embodiment, the inlet bobbin 4 is provided with the plug-in type cable terminal 12 as an inlet terminal, and the tip of the neutral point connection side 71 of the discharge gap 70 is provided with the neutral point lead terminal 8. In other embodiments of the present invention, the incoming line terminal on the incoming line cylinder 4 may also adopt the neutral point lead terminal 8, and the incoming line terminal may be provided only at the incoming line cylinder 4, or only at the neutral point connection side 71 of the discharge gap 70. When a line terminal is provided on the neutral point connection side 71 of the discharge gap 70, the line feed cylinder 4 may be a three-way structure, and the branched conductive structure may be a three-way joint.
In the above described embodiments the zero sequence current transformer is sleeved on the ground side of the discharge gap, in other implementations the zero sequence current transformer may also take other forms, for example being arranged on the neutral point connection side.
Finally, it should be noted that the above mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made without inventive effort to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A gas insulated metal enclosed neutral point complete device comprises a lightning arrester, an isolating switch and a discharge gap; the discharge gap comprises a neutral point connecting side and a grounding side, the neutral point connecting side is used for being conducted with a neutral point of the transformer, and the grounding side is used for being grounded;
the method is characterized in that:
the lightning arrester and the isolating switch are both of a closed structure and are vertically arranged, the top parts of the lightning arrester and the isolating switch are provided with top conductive terminals, and the bottom parts of the lightning arrester and the isolating switch are provided with grounding terminals;
the top of one of the lightning arrester and the isolating switch is provided with a wire inlet cylinder, and the top of the other one of the lightning arrester and the isolating switch is provided with a switching cylinder; an intermediate cylinder is arranged between the wire inlet cylinder and the switching cylinder;
a middle conductor is arranged in the middle cylinder, a switching conductor is arranged in the switching cylinder, and the middle conductor is connected with a top conductive terminal on a lightning arrester or an isolating switch below the switching cylinder through the switching conductor;
the neutral point connecting side of the discharge gap is fixed at the top of the wire inlet cylinder, the grounding side of the discharge gap is electrically connected with the adapter cylinder or provided with a grounding connecting end, and the neutral point connecting side and the grounding side of the discharge gap are both exposed in the air;
a branch conductive structure is arranged in the wire inlet cylinder and is simultaneously conducted with a top conductive terminal on the lightning arrester or the isolating switch below the wire inlet cylinder, a corresponding end of the middle conductor and a neutral point connecting side of the lightning arrester;
the wire inlet cylinder is further provided with a wire inlet terminal used for being conducted with the branch conductive structure, and/or a wire inlet terminal used for being conducted with a neutral point of the transformer is arranged on the neutral point connecting side of the discharge gap.
2. The gas insulated metal enclosed neutral point kit of claim 1, wherein: and one end of the middle barrel, which is close to the wire inlet barrel, is provided with a wire inlet side insulation basin, and the wire inlet side insulation basin is used for isolating the middle barrel from the wire inlet barrel.
3. The gas insulated metal enclosed neutral point kit of claim 2, wherein: the branch conducting structure is formed by a cross joint, one end of the cross joint is fixed on the wire inlet side insulating basin, and the other three ends are provided with inserting conducting structures.
4. The gas insulated metal enclosed neutral point kit of claim 3, wherein: the cross joint is provided with a blind hole extending along the axial direction of the wire inlet side insulation basin, and the bottom wall of the blind hole is fixed on the wire inlet side insulation basin through a screw.
5. A gas insulated metal enclosed neutral point kit according to any one of claims 2 to 4, wherein: one end of the middle cylinder body, which is close to the switching cylinder body, is provided with a switching side insulating basin, and the switching side insulating basin is used for isolating the middle cylinder body from the switching cylinder body.
6. A gas insulated metal enclosed neutral point kit according to any one of claims 2 to 4, wherein: and a switch side insulating basin is arranged between the switching cylinder and the isolating switch and used for isolating the switching cylinder from the isolating switch.
7. A gas insulated metal enclosed neutral point kit according to any one of claims 1 to 4, wherein: the gas insulated metal enclosed neutral point complete device comprises a zero sequence current transformer, wherein the zero sequence current transformer is sleeved on the grounding side of the discharge gap.
8. A gas insulated metal enclosed neutral point kit according to any one of claims 1 to 4, wherein: and a neutral point lead terminal is arranged at the top end of the neutral point connecting side of the discharge gap and is used for conducting connection with the neutral point lead.
9. A gas insulated metal enclosed neutral point kit according to any one of claims 1 to 4, wherein: the wire inlet terminal arranged on the wire inlet barrel is a plug-in cable terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921554314.0U CN210926855U (en) | 2019-09-18 | 2019-09-18 | Gas-insulated metal-enclosed neutral point complete device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921554314.0U CN210926855U (en) | 2019-09-18 | 2019-09-18 | Gas-insulated metal-enclosed neutral point complete device |
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| CN210926855U true CN210926855U (en) | 2020-07-03 |
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| CN201921554314.0U Active CN210926855U (en) | 2019-09-18 | 2019-09-18 | Gas-insulated metal-enclosed neutral point complete device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110752536A (en) * | 2019-09-18 | 2020-02-04 | 国网浙江省电力有限公司经济技术研究院 | Gas insulated metal enclosed neutral point complete equipment |
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2019
- 2019-09-18 CN CN201921554314.0U patent/CN210926855U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110752536A (en) * | 2019-09-18 | 2020-02-04 | 国网浙江省电力有限公司经济技术研究院 | Gas insulated metal enclosed neutral point complete equipment |
| CN110752536B (en) * | 2019-09-18 | 2023-11-03 | 国网浙江省电力有限公司经济技术研究院 | Gas-insulated metal-enclosed neutral point complete equipment |
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