CN110556732A - Special temporary grounding device and method for fixed contact of 10kV trolley switch cabinet - Google Patents
Special temporary grounding device and method for fixed contact of 10kV trolley switch cabinet Download PDFInfo
- Publication number
- CN110556732A CN110556732A CN201910982305.XA CN201910982305A CN110556732A CN 110556732 A CN110556732 A CN 110556732A CN 201910982305 A CN201910982305 A CN 201910982305A CN 110556732 A CN110556732 A CN 110556732A
- Authority
- CN
- China
- Prior art keywords
- contact
- fixing spring
- grounding
- switch cabinet
- contact blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B11/00—Switchgear having carriage withdrawable for isolation
- H02B11/28—Earthing arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
Abstract
the invention relates to a special temporary grounding device and method for a fixed contact of a 10kV trolley switch cabinet, and belongs to the technical field of electric power grounding devices. The technical scheme is as follows: the contact clamping handles (4) of the four contact blades are respectively clamped in four clamping grooves (10) of the handheld rod and are distributed in a cross shape; the arc surfaces of two adjacent contact blades are contacted, and four marking ports of the arc surfaces are communicated to form a static contact insertion port of the trolley switch cabinet; the contact blade rear fixing spring and the contact blade top fixing spring (15) are respectively embedded into the contact blade rear fixing spring grooves and the contact blade top fixing spring grooves (1) on the four contact blades; the number of the grounding copper branch flexible wires (17) is four, and one ends of the four grounding copper branch flexible wires (17) are respectively connected to the ground wire connecting terminals (5) on the four contact blades. The invention has the advantages of quick assembly and small occupied area, can reliably ground the fixed contact of the trolley switch cabinet, and improves the equipment maintenance efficiency and the safety of field maintenance.
Description
Technical Field
The invention relates to a special temporary grounding device and method for a fixed contact of a 10kV trolley switch cabinet, and belongs to the technical field of electric power grounding devices.
Background
At present in electric power system, when 10kV dolly cubical switchboard body has a power failure and overhauls, generally use ground connection dolly, perhaps have a power failure with 10kV generating line, open the generating line railway carriage or compartment, hang interim ground wire on the generating line row, use ground connection dolly to be restricted to ground connection dolly quantity, 4 to 6 ground connection dollies are disposed to general 10kV machinery room, 10kV distribution and main switch quantity are above 10 at least, cause can not all sealed hermetically, have a power failure with 10kV generating line, open the railway carriage or compartment, hang interim ground wire on the generating line row and enlarge the power failure scope, influence reliable power supply, when how to solve 10kV cubical switchboard power failure, static contact ground connection problem is the problem that this area of urgent need to be solved.
disclosure of Invention
The invention aims to provide a temporary grounding device and a method special for a fixed contact of a 10kV trolley switch cabinet.
The technical scheme of the invention is as follows:
A special temporary grounding device for a fixed contact of a 10kV trolley switch cabinet comprises a contact blade, a handheld rod, a fixed spring at the rear part of the contact blade, a fixed spring at the top part of the contact blade, a grounding copper branch flexible wire and a grounding wire grounding head; the end part of the handheld rod is provided with four mutually communicated clamping grooves which are arranged in a cross shape; the contact piece consists of a contact clamping handle, a connecting sheet and an arc-shaped contact piece which are sequentially connected, the contact clamping handle is rectangular, a spring groove is fixed at the rear part of the contact piece and is arranged outside the contact clamping handle, one end of the contact clamping handle is provided with a ground wire connecting terminal, the other end of the contact clamping handle is connected with one end of the connecting sheet, and the other end of the connecting sheet is connected with the arc-shaped contact piece; the outer side of the arc-shaped contact piece is provided with a spring groove fixed at the top of the contact piece, the inner side of the arc-shaped contact piece is a protruded arc-shaped surface, and the arc-shaped surface is provided with a scribing port; the number of the contact blades is four, and the contact clamping handles of the four contact blades are respectively clamped in the four clamping grooves and are distributed in a cross shape; the arc surfaces of two adjacent contact sheets are contacted, four scribing ports of the arc surfaces are communicated to form a trolley switch cabinet static contact insertion port, and the trolley switch cabinet static contact is matched with the trolley switch cabinet static contact insertion port; the contact blade rear fixing spring and the contact blade top fixing spring are both annular springs, and the contact blade rear fixing spring and the contact blade top fixing spring are respectively embedded into contact blade rear fixing spring grooves and contact blade top fixing spring grooves on the four contact blades; the number of the grounding copper branch flexible wires is four, one ends of the four grounding copper branch flexible wires are respectively connected to the grounding wire connecting terminals on the four contact blades, the other ends of the four grounding copper branch flexible wires are wound together to form one grounding copper flexible wire, and the grounding copper flexible wire is connected with a grounding wire grounding head.
The handheld rod is composed of a connecting rod and a handle, the handle is arranged at the rear end of the connecting rod, and the cross-shaped clamping groove is formed in the end portion of the front end of the connecting rod.
The fixed spring grooves at the rear parts of the contact blades of the four contact blades are clamped into the handle and are all on the same circumference; and the fixed spring grooves at the top parts of the contact blades on the arc-shaped contact blades of the four contact blades are all arranged on the same circumference.
The contact blade rear fixing spring groove is two, namely a contact blade rear fixing spring groove I and a contact blade rear fixing spring groove II, the contact blade rear fixing springs are two, namely a contact blade rear fixing spring I and a contact blade rear fixing spring II, and the contact blade rear fixing spring I and the contact blade rear fixing spring II are respectively matched and embedded into the contact blade rear fixing spring groove I and the contact blade rear fixing spring groove II.
Gaps are reserved among the inner sides of the connecting pieces of the four contact blades.
A special temporary grounding method for a fixed contact of a 10kV trolley switch cabinet adopts the temporary grounding device and comprises the following steps:
Firstly, four contact blades are arranged in four clamping grooves at the end part of a handheld rod, and then a contact blade rear fixing spring and a contact blade top fixing spring are respectively embedded into a contact blade rear fixing spring groove and a contact blade top fixing spring groove of the four contact blades;
And secondly, during operation, an operator firstly tests electricity of the fixed contact of the trolley switch cabinet, after no electricity is tested, one ends of the four grounding copper branch flexible wires are respectively connected to the ground wire connecting terminals on the four contact blades, the other ends of the four grounding copper branch flexible wires are wound together to form one grounding copper flexible wire, the grounding copper flexible wire is connected with one end of a grounding wire grounding head, the other end of the grounding wire grounding head is connected to the grounding bar, then the operator holds the hand-held rod, aligns an insertion hole of the fixed contact of the trolley switch cabinet to the fixed contact of the trolley switch cabinet, inserts the fixed contact of the trolley switch cabinet into the temporary grounding device, and completes temporary grounding of the fixed contact of the trolley switch cabinet.
The invention has the following positive effects: the equipment is swift, and area is little, and when 10kV dolly switch had a power failure, dolly cubical switchboard static contact can reliably ground connection, improves the security of equipment maintenance efficiency and on-the-spot maintenance, improves work efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a contact blade according to the present invention;
FIG. 3 is a schematic view of the scribing port structure of the present invention;
FIG. 4 is a schematic view of a hand-held wand of the present invention;
In the figure: the contact piece top fixing spring groove 1, the arc contact piece 2, the scribing opening 3, the contact clamping handle 4, the ground wire connecting terminal 5, the contact piece rear fixing spring groove I6, the contact piece rear fixing spring groove II 7, the connecting sheet 8, the handheld rod 9, the clamping groove 10, the connecting rod 11, the handle 12, the contact piece rear fixing spring I13, the contact piece rear fixing spring II 14, the contact piece top fixing spring 15, the grounding copper flexible wire 16, the grounding copper sub flexible wire 17 and the grounding wire grounding head 18.
Detailed Description
The invention is further described with reference to the following figures and examples:
A special temporary grounding device for a fixed contact of a 10kV trolley switch cabinet comprises a contact blade, a handheld rod 9, a fixed spring at the rear part of the contact blade, a fixed spring 15 at the top part of the contact blade, a grounding copper branch flexible wire 17 and a grounding wire grounding head 18; the end part of the handheld rod 9 is provided with four mutually communicated clamping grooves 10, and the four clamping grooves 10 are arranged in a cross shape; the contact piece consists of a contact clamping handle 4, a connecting sheet 8 and an arc-shaped contact piece 2 which are sequentially connected, the contact clamping handle 4 is rectangular, a rear fixing spring groove of the contact piece is arranged on the outer side of the contact clamping handle 4, a ground wire connecting terminal 5 is arranged at one end of the contact clamping handle 4, the other end of the contact clamping handle 4 is connected with one end of the connecting sheet 8, and the other end of the connecting sheet 8 is connected with the arc-shaped contact piece 2; a spring groove 1 is fixed at the top of the contact blade and arranged at the outer side of the arc contact blade 2, the inner side of the arc contact blade 2 is a protruded arc surface, and a scribing port is arranged on the arc surface; the number of the contact blades is four, and the contact clamping handles 4 of the four contact blades are respectively clamped in the four clamping grooves 10 and are distributed in a cross shape; the arc surfaces of two adjacent contact sheets are contacted, four scribing ports of the arc surfaces are communicated to form a trolley switch cabinet static contact insertion port, and the trolley switch cabinet static contact is matched with the trolley switch cabinet static contact insertion port; the contact blade rear fixing spring and the contact blade top fixing spring 15 are both annular springs, and the contact blade rear fixing spring and the contact blade top fixing spring 15 are respectively embedded into contact blade rear fixing spring grooves and contact blade top fixing spring grooves 1 on the four contact blades; the number of the grounding copper branch cords 17 is four, one ends of the four grounding copper branch cords 17 are respectively connected to the ground wire connecting terminals 5 on the four contact blades, the other ends of the four grounding copper branch cords 17 are wound together to form one grounding copper cord 16, and the grounding copper cord 16 is connected with a grounding wire grounding head 18.
The handheld rod 9 is composed of a connecting rod 11 and a handle 12, the handle 12 is arranged at the rear end of the connecting rod 11, and the cross clamping groove 10 is arranged at the front end of the connecting rod.
The contact clamping handle 4 is provided with four contact blades, and the fixed spring grooves at the rear parts of the contact blades are all arranged on the same circumference; the contact blade top fixing spring grooves 1 on the arc-shaped contact blades 2 of the four contact blades are all on the same circumference.
The number of the contact blade rear fixing spring grooves is two, namely a contact blade rear fixing spring groove I6 and a contact blade rear fixing spring groove II 7, the number of the contact blade rear fixing springs is two, namely a contact blade rear fixing spring I13 and a contact blade rear fixing spring II 14, and the contact blade rear fixing spring I13 and the contact blade rear fixing spring II 14 are respectively embedded into the contact blade rear fixing spring groove I6 and the contact blade rear fixing spring groove II 7 in a matched mode.
Gaps are reserved among the inner sides of the connecting pieces of the four contact blades.
A special temporary grounding method for a fixed contact of a 10kV trolley switch cabinet adopts the temporary grounding device and comprises the following steps:
firstly, four contact blades are arranged in four clamping grooves 10 at the end part of a handheld rod 9, then a contact blade rear fixing spring and a contact blade top fixing spring 15 are respectively embedded into contact blade rear fixing spring grooves and contact blade top fixing spring grooves 1 of the four contact blades, the contact blade rear fixing spring clamps the contacts of the four contact blades into a handle 4 to be clamped, so that the four contact blades can be clamped in the clamping grooves 10 at the end part of the handheld rod 9, and meanwhile, the contact top fixing spring 15 clamps arc-shaped contact blades 2 of the four contact blades to avoid the four contact blades from scattering;
and secondly, during operation, an operator firstly tests electricity of the fixed contact of the trolley switch cabinet, after no electricity is tested, one ends of four grounding copper branch flexible wires 17 are respectively connected to the ground wire connecting terminals 5 on the four contact blades, the other ends of the four grounding copper branch flexible wires 17 are wound together to form a grounding copper flexible wire 16, the grounding copper flexible wire 16 is connected with one end of a grounding wire grounding head 18, the other end of the grounding wire grounding head 18 is connected to the grounding bar, then the operator holds the hand-held rod 9, aligns the fixed contact insertion hole of the trolley switch cabinet to the fixed contact of the trolley switch cabinet, and inserts the fixed contact of the trolley switch cabinet into the temporary grounding device to complete temporary grounding of the fixed contact of the trolley switch cabinet.
the contact blades are made of copper conductive materials, the four contact blades are arranged in pairs in an opposite mode to form a cross-shaped contact structure, the cross-shaped contact structure is directly contacted with a fixed contact of a trolley switch cabinet, in order to be better inserted, the inner side of the arc-shaped contact blade 2 is designed to be an arc-shaped surface, the contact stability is guaranteed, and the arc-shaped contact blade 2 cannot move when in contact.
The first contact blade rear fixing spring groove 6, the second contact blade rear fixing spring groove 7 and the first contact blade top fixing spring groove 1 ensure that the positions of the first contact blade rear fixing spring 13, the second contact blade rear fixing spring 14 and the second contact blade top fixing spring 15 cannot shift, and further ensure that the positions of the four contact blades are fixed and cannot scatter.
The handheld rod is divided into a handle part and a connecting rod part, the handle part is a handheld part during insertion operation, and the connecting rod part is in an insulation design, so that the grounding end and the insulation of an operator are guaranteed.
During the operation, operating personnel tests the electricity to the dolly cubical switchboard static contact that needs hang interim earthing device, test out electroless back, on the ground connection row is received to the earthing joint of earth connection, then hold handle department, insert interim earthing device's cross contact structure, easy operability when arc contact 2's arcwall face design is guaranteed to insert into, contact top fixed spring 15 guarantees four contact pieces contact compactness, when the drawing line mouth design of arcwall face is guaranteed to contact with cylindrical dolly cubical switchboard static contact, the stability of contact, the displacement can not appear. The contact clamping handles of the four contact blades are embedded into the four clamping grooves at the end part of the connecting rod and mutually fastened together under the action force of a fixed spring at the rear part of the contact blade.
Claims (6)
1. The utility model provides a special interim earthing device of 10kV dolly cubical switchboard static contact which characterized in that: comprises a contact blade, a hand-held rod (9), a fixed spring at the rear part of the contact blade, a fixed spring (15) at the top part of the contact blade, a grounding copper branch flexible wire (17) and a grounding wire grounding head (18); the end part of the handheld rod (9) is provided with four mutually communicated clamping grooves (10), and the four clamping grooves (10) are arranged in a cross shape; the contact piece consists of a contact clamping handle (4), a connecting sheet (8) and an arc-shaped contact piece (2) which are sequentially connected, the contact clamping handle (4) is rectangular, a rear fixing spring groove of the contact piece is arranged on the outer side of the contact clamping handle (4), one end of the contact clamping handle (4) is provided with a ground wire connecting terminal (5), the other end of the contact clamping handle (4) is connected with one end of the connecting sheet (8), and the other end of the connecting sheet (8) is connected with the arc-shaped contact piece (2); a spring groove (1) is fixed at the top of the contact blade and arranged on the outer side of the arc contact blade (2), the inner side of the arc contact blade (2) is a protruded arc surface, and a scribing port is arranged on the arc surface; the number of the contact blades is four, and the contact clamping handles (4) of the four contact blades are respectively clamped in the four clamping grooves (10) and are distributed in a cross shape; the arc surfaces of two adjacent contact sheets are contacted, four scribing ports of the arc surfaces are communicated to form a trolley switch cabinet static contact insertion port, and the trolley switch cabinet static contact is matched with the trolley switch cabinet static contact insertion port; the contact blade rear fixing spring and the contact blade top fixing spring (15) are both annular springs, and the contact blade rear fixing spring and the contact blade top fixing spring (15) are respectively embedded into contact blade rear fixing spring grooves and contact blade top fixing spring grooves (1) on the four contact blades; the number of the grounding copper branch cords (17) is four, one ends of the four grounding copper branch cords (17) are respectively connected to the grounding wire connecting terminals (5) on the four contact blades, the other ends of the four grounding copper branch cords (17) are wound together to form one grounding copper cord (16), and the grounding copper cord (16) is connected with a grounding wire grounding head (18).
2. the special temporary grounding device for the fixed contact of the 10kV trolley switch cabinet as claimed in claim 1, wherein the special temporary grounding device comprises: the handheld rod (9) is composed of a connecting rod (11) and a handle (12), the handle (12) is arranged at the rear end of the connecting rod (11), and the cross clamping groove (10) is arranged at the end part of the front end.
3. The special temporary grounding device for the fixed contact of the 10kV trolley switch cabinet as claimed in claim 1, wherein the special temporary grounding device comprises: the fixed spring grooves at the rear parts of the contact blades of the four contact blades are clamped into the handle (4) and are all on the same circumference; the contact blade top fixed spring grooves (1) on the arc-shaped contact blades (2) of the four contact blades are all arranged on the same circumference.
4. the special temporary grounding device for the fixed contact of the 10kV trolley switch cabinet as claimed in claim 1, wherein the special temporary grounding device comprises: gaps are reserved among the inner sides of the connecting pieces of the four contact blades.
5. the special temporary grounding device for the fixed contact of the 10kV trolley switch cabinet as claimed in claim 1, wherein the special temporary grounding device comprises: the contact blade rear fixing spring groove is divided into two first contact blade rear fixing spring grooves (6) and two second contact blade rear fixing spring grooves (7), the two first contact blade rear fixing springs are divided into a first contact blade rear fixing spring (13) and a second contact blade rear fixing spring (14), and the first contact blade rear fixing spring (13) and the second contact blade rear fixing spring (14) are respectively embedded into the first contact blade rear fixing spring groove (6) and the second contact blade rear fixing spring groove (7) in a matching mode.
6. A special temporary grounding method for a fixed contact of a 10kV trolley switch cabinet adopts the temporary grounding device defined by any one of claims 1 to 5, and is characterized in that:
Firstly, four contact blades are arranged in four clamping grooves (10) at the end part of a handheld rod (9), then a contact blade rear fixing spring and a contact blade top fixing spring (15) are respectively embedded into contact blade rear fixing spring grooves and contact blade top fixing spring grooves (1) of the four contact blades, the contact blade rear fixing spring clamps contacts of the four contact blades into a handle (4) to be clamped, so that the four contact blades can be clamped in the clamping grooves (10) at the end part of the handheld rod (9), and meanwhile, the contact top fixing spring (15) clamps arc-shaped contact blades (2) of the four contact blades to avoid the four contact blades from scattering;
when the trolley switch cabinet static contact is operated, an operator firstly tests electricity of the trolley switch cabinet static contact, after no electricity is tested, one ends of four grounding copper branch flexible wires (17) are respectively connected to the ground wire connecting terminals (5) on the four contact blades, the other ends of the four grounding copper branch flexible wires (17) are wound together to form a grounding copper flexible wire (16), the grounding copper flexible wire (16) is connected with one end of a grounding wire grounding head (18), the other end of the grounding wire grounding head (18) is connected to a grounding bar, then the hand-held rod (9) is held by hand, a trolley switch cabinet static contact insertion hole is aligned to the trolley switch cabinet static contact, the trolley switch cabinet static contact is inserted into the temporary grounding device, and the temporary grounding of the trolley switch cabinet static contact is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910982305.XA CN110556732A (en) | 2019-10-16 | 2019-10-16 | Special temporary grounding device and method for fixed contact of 10kV trolley switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910982305.XA CN110556732A (en) | 2019-10-16 | 2019-10-16 | Special temporary grounding device and method for fixed contact of 10kV trolley switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110556732A true CN110556732A (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910982305.XA Pending CN110556732A (en) | 2019-10-16 | 2019-10-16 | Special temporary grounding device and method for fixed contact of 10kV trolley switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110556732A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325237A (en) * | 2021-12-29 | 2022-04-12 | 深圳供电局有限公司 | Power distribution network temporary grounding wire monitoring system |
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| CN201674132U (en) * | 2010-06-12 | 2010-12-15 | 颜景纯 | Switch cubicle baffle plate opening device and special bus short circuit ground wire moving contact |
| CN103944094A (en) * | 2014-05-14 | 2014-07-23 | 国家电网公司 | 10-kV handcart switch cabinet bus fixed contact ground method and special grounding device thereof |
| CN204205095U (en) * | 2014-07-31 | 2015-03-11 | 国网河南省电力公司济源供电公司 | KYN28 type switch cabinet bus fixed contact earthing device |
| CN106856306A (en) * | 2017-03-16 | 2017-06-16 | 国网黑龙江省电力有限公司鹤岗供电公司 | Make the method that the static contact of wheelbarrow switch fracture is grounded using handcart-type switch Special grounding wire |
| CN110048334A (en) * | 2019-05-15 | 2019-07-23 | 榆林市电力检修有限公司 | Enclosed switchgear novel intelligent ground line |
| CN210326674U (en) * | 2019-10-16 | 2020-04-14 | 国网冀北电力有限公司唐山供电公司 | Special temporary grounding device for fixed contact of 10kV trolley switch cabinet |
-
2019
- 2019-10-16 CN CN201910982305.XA patent/CN110556732A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201674132U (en) * | 2010-06-12 | 2010-12-15 | 颜景纯 | Switch cubicle baffle plate opening device and special bus short circuit ground wire moving contact |
| CN103944094A (en) * | 2014-05-14 | 2014-07-23 | 国家电网公司 | 10-kV handcart switch cabinet bus fixed contact ground method and special grounding device thereof |
| CN204205095U (en) * | 2014-07-31 | 2015-03-11 | 国网河南省电力公司济源供电公司 | KYN28 type switch cabinet bus fixed contact earthing device |
| CN106856306A (en) * | 2017-03-16 | 2017-06-16 | 国网黑龙江省电力有限公司鹤岗供电公司 | Make the method that the static contact of wheelbarrow switch fracture is grounded using handcart-type switch Special grounding wire |
| CN110048334A (en) * | 2019-05-15 | 2019-07-23 | 榆林市电力检修有限公司 | Enclosed switchgear novel intelligent ground line |
| CN210326674U (en) * | 2019-10-16 | 2020-04-14 | 国网冀北电力有限公司唐山供电公司 | Special temporary grounding device for fixed contact of 10kV trolley switch cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114325237A (en) * | 2021-12-29 | 2022-04-12 | 深圳供电局有限公司 | Power distribution network temporary grounding wire monitoring system |
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