CN110474171B - Circuit side shielding type grounding end structure and use method thereof - Google Patents
Circuit side shielding type grounding end structure and use method thereof Download PDFInfo
- Publication number
- CN110474171B CN110474171B CN201910644861.6A CN201910644861A CN110474171B CN 110474171 B CN110474171 B CN 110474171B CN 201910644861 A CN201910644861 A CN 201910644861A CN 110474171 B CN110474171 B CN 110474171B
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- buckle plate
- semicircular arc
- insulation
- fixed
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000009413 insulation Methods 0.000 claims description 28
- 238000009434 installation Methods 0.000 abstract description 9
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 208000034699 Vitreous floaters Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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- 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
- H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
- H01R4/2404—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation
- H01R4/2406—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation having needles or pins
-
- 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
- H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies
-
- 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
- H01R4/70—Insulation of connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Electric Cable Installation (AREA)
- Insulating Bodies (AREA)
Abstract
The invention relates to a line side shielding type grounding end structure and a use method thereof. The invention has the beneficial effects that: when the circuit is in normal operation, the naked leakage electrification part does not exist, and when the grounding wire is required to be installed, the field electricity inspection and the grounding wire installation can be implemented once the circuit is naked leakage; the invention can thoroughly solve the problem of the exposure of new electrified points caused by the installation of the grounding ring on the insulated wire, and effectively prevent the grounding and short-circuit faults caused by the exposure.
Description
Technical Field
The invention relates to the technical field of power supply line maintenance, in particular to a line side shielding type grounding end structure and a using method thereof.
Background
At present, in order to ensure the necessary maintenance and power failure operation requirement of a 10 kilovolt power supply circuit and a 0.4 kilovolt low-voltage circuit, a grounding ring needs to be installed at the positions of a circuit T contact point, a head rod, a tail rod, a low-voltage circuit outlet, a corner rod side or a photovoltaic power generation network access point and the like, so that the power failure operation is convenient, the grounding wire is tested and installed, and the operation work safety is ensured. However, after the grounding ring is installed, because of the existence of the bare leakage charging part, when the circuit normally operates, the safety hazards of grounding and short circuit are increased due to branches, floaters and the like, and new potential safety hazards are formed.
Disclosure of Invention
The invention provides a circuit side shielding type grounding end structure and a use method thereof, and aims to design and manufacture a shielding electricity testing grounding device for a low-voltage circuit, wherein during normal operation, a circuit does not have a naked leakage electrification part, and when a grounding wire is required to be installed, on-site electricity testing and grounding wire installation can be implemented once the circuit is operated and naked leakage exists; the invention can thoroughly solve the problem of the exposure of new electrified points caused by the installation of the grounding ring on the insulated wire, and effectively prevent the grounding and short-circuit faults caused by the exposure.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The utility model provides a circuit side shielding formula ground connection end structure, includes conductive wire clamp, insulating stopper, insulating shielding sheath, the conductive wire clamp is fixed in wire ground connection position department, and two insulating stoppers set up in the both sides of conductive wire clamp and fix on the wire, and insulating shielding sheath cover is outside at the conductive wire clamp, and insulating shielding sheath's both ends hasp is on insulating stopper.
The conductive wire clamp comprises anchor clamps, a connecting plate and conductive spines, wherein the connecting plate is fixed on two sides of the anchor clamps, bolt holes are formed in the connecting plate, the conductive spines are fixed on the inner wall of the anchor clamps, and the two conductive wire clamps are mutually buckled on two sides of a wire and are locked and fixed through bolts.
The insulating limiter comprises a fixed end and a limiting end, wherein the fixed end and the limiting end are connected with each other, the diameter of the limiting end is smaller than that of the fixed end, and shaft center through holes matched with the diameter of the lead are formed in the fixed end and the limiting end.
The insulating shielding sheath comprises a semicircular arc fixing buckle plate, a semicircular arc overturning buckle plate and a linkage block, wherein the middle position of the semicircular arc overturning buckle plate is hinged with the end part of the semicircular arc fixing buckle plate, and the linkage block is arranged on the semicircular arc fixing buckle plate.
The semi-arc overturning buckle plate is characterized in that a positioning clamping groove is fixed on the semi-arc overturning buckle plate, a positioning shaft is fixed on the linkage block, the positioning shaft enters the positioning clamping groove through screwing the linkage block, and the semi-arc fixed buckle plate and the semi-arc overturning buckle plate which are buckled together are positioned.
The utility model provides an insulating action bars for installing line side shielding formula ground connection end structure, includes insulating jaw, insulating stay cord, insulating pull rod, insulating handle, and two insulating jaws hinge at the tip of insulating pull rod, and insulating handle articulates the other end at insulating pull rod, and insulating handle passes through insulating stay cord pulling insulating jaw closure.
The method for installing and detaching the line side shielding type grounding end structure comprises the following steps:
1) Firstly, fixing a conductive wire clamp on a wire, and then respectively fixing two insulating limiters on two sides of the conductive wire clamp, wherein limiting ends on the insulating limiters are oppositely arranged;
2) During normal operation, the semicircular arc fixing buckle plate and the semicircular arc overturning buckle plate are turned over, the linkage block on the insulating shielding sheath is clamped by the insulating clamp at the end part of the insulating operation rod, the insulating shielding sheath is sent to the middle position of the two insulating limiters, the opening of the semicircular arc overturning buckle plate and the opening of the semicircular arc fixing buckle plate are buckled on the limiting ends of the two insulating limiters, the linkage block is pushed, the semicircular arc overturning buckle plate rotates, and the semicircular arc overturning buckle plate and the semicircular arc fixing buckle plate are buckled together and are covered on the outer side of the conductive wire clamp;
3) Rotating the linkage block, screwing the positioning shafts on two sides of the linkage block into the positioning clamping grooves on two sides, and positioning the semicircular overturning buckle plate and the semicircular fixing buckle plate which are buckled together;
4) When the grounding is needed, the insulating clamp at the end part of the insulating operation rod is used for clamping the linkage block on the insulating shielding sheath, the linkage block is rotated, the positioning shaft leaves the positioning clamping groove, the semicircular arc fixing buckle plate is pulled outwards, the semicircular arc overturning buckle plate is overturned, the opening is exposed, and the insulating shielding sheath is taken down.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention can be arranged on a 10 kilovolt and 0.4 kilovolt line, and can realize the installation of the insulated wire puncture clamp without breaking the wire, thereby improving the working efficiency. The problem of in the three-phase four-wire batch meter, the phase line does not have earth connection articulation point, power failure operation earth connection installation is difficult is solved.
2) The invention realizes the secondary insulation shielding function after the grounding wire clamp is installed on the insulated wire, can thoroughly solve the problem of exposure of new electrified points caused by installation of the grounding ring on the insulated wire, and effectively prevents the grounding and short-circuit faults caused by the exposure.
3) The shielding insulation shield outside the conductive wire clamp can be assembled and disassembled, and the operation is convenient and flexible. Insulating limiters are arranged on two sides of the conductive wire clamp, so that the insulating shielding cover is convenient to install and fix, dislocation is avoided, and the wire clamp is exposed.
4) The invention is provided with the insulating operating rod, increases the effective working distance, can realize frequent operation of the insulating cover of the 10 kilovolt line grounding wire clamp, and has simple operation and convenient use.
5) The invention has low manufacturing cost, and the manufacturing material is composed of rubber, plastic and metal materials, and has small volume and light weight.
Drawings
FIG. 1 is a schematic diagram of a conductive clip of the present invention;
FIG. 2 is a schematic view of the structure of the insulating stopper according to the present invention;
FIG. 3 is a schematic view of the structure of an insulating sheath according to the present invention;
Fig. 4 is a cross-sectional view of an insulating sheath;
FIG. 5 is a schematic view of the structure of the linkage block on the insulating sheath;
FIG. 6 is a schematic view of the structure of the insulating operating rod;
FIG. 7 is a schematic illustration of the installation of a conductive clip with an insulating stopper;
fig. 8 is a schematic view of the overall installation of a line side shield ground structure according to the present invention.
In the figure: 1. a conductive wire clip; 1-1, bolt holes; 1-2, conductive spines; 1-3 connecting plates; 1-4 anchor ears; 2. an insulating stopper; 2-1, fixed end; 2-2, hinging the shaft sleeve; 2-3, limiting ends; 3. an insulating shielding sheath; 3-1, a semicircular arc overturning buckle plate; 3-2, hinging point; 3-3, semi-arc fixing buckle plates; 3-4, linking blocks; 3-5, positioning clamping grooves; 3-6, positioning the shaft; 3-7 springs; 4. an insulating operation rod; 4-1, insulating jaws; 4-2, insulating pull ropes; 4-3, insulating handle; 4-4, insulating pull rods; 5. and (5) conducting wires.
Detailed Description
The present invention will be described in detail with reference to examples, but the scope of the present invention is not limited to the examples.
As shown in fig. 1-8, a line side shielding type grounding end structure comprises a conductive wire clamp 1, an insulating limiter 2 and an insulating shielding sheath 3, wherein the conductive wire clamp 1 is fixed at the grounding position of a wire 5, two insulating limiters 2 are arranged on two sides of the conductive wire clamp 1 and fixed on the wire 5, the insulating shielding sheath 3 is sleeved outside the conductive wire clamp 1, and two ends of the insulating shielding sheath 3 are buckled on the insulating limiters 2.
The conductive wire clamp 1 comprises anchor clamps 1-4, connecting plates 1-3 and conductive spines 1-2, wherein the connecting plates 1-3 are fixed on two sides of the anchor clamps 1-4, bolt holes 1-1 are formed in the connecting plates 1-3, the conductive spines 1-2 are fixed on the inner wall of the anchor clamps 1-4, and the two conductive wire clamps 1 are mutually buckled on two sides of a wire 5 and are locked and fixed through bolts. The wire clamp 1 and the conductive spike 1-2 fixed in the wire clamp are all made of conductive metal. When the two conductive wire clamps 1 are fixed on the wire 5, the conductive spikes 1-2 pierce the insulating wire cover on the wire 5 and are communicated with the inner wire core.
The insulation limiter 2 comprises a fixed end 2-1 and a limiting end 2-3, wherein the fixed end 2-1 and the limiting end 2-3 are connected with each other, the diameter of the limiting end 2-3 is smaller than that of the fixed end 2-1, and shaft center through holes matched with the diameter of the lead 5 are formed in the fixed end 2-1 and the limiting end 2-3.
Referring to fig. 2, the insulating stopper 2 is two halves fastened symmetrically to each other, two fixing ends 2-1 are hinged to each other, and are fixed to opposite sides of the hinge sleeve 2-2 by screw or fastener connection. The inner diameter of the shaft center through hole is slightly smaller than the diameter of the wire 5, so that the insulation limiter 2 can be fixed on the wire 5 without sliding. The insulating stopper 2 may be made of rubber or plastic as a whole.
The insulation shielding sheath 3 comprises a semicircular arc fixing buckle plate 3-3, a semicircular arc overturning buckle plate 3-1 and a linkage block 3-4, wherein the middle position of the semicircular arc overturning buckle plate 3-1 is hinged with the end part of the semicircular arc fixing buckle plate 3-3, and the linkage block 3-4 is arranged on the semicircular arc fixing buckle plate 3-3. The insulating shielding sheath 3 is made of insulating mica material.
The semi-arc overturning buckle plate 3-1 is fixedly provided with a positioning clamping groove 3-5, the linkage block 3-4 is fixedly provided with a positioning shaft 3-6, the positioning shaft 3-6 enters the positioning clamping groove 3-5 through screwing the linkage block 3-4, and the semi-arc fixed buckle plate 3-3 and the semi-arc overturning buckle plate 3-1 which are buckled together are positioned.
The linkage block 3-4 is connected on the semi-arc fixed buckle plate 3-3 in a penetrating way and can rotate. The connecting block 3-4 is sleeved with a spring 3-7.
As shown in fig. 4, an insulating operation rod 4 for installing a line side shielding type grounding end structure comprises an insulating clamp 4-1, an insulating pull rope 4-2, an insulating pull rod 4-4 and an insulating handle 4-3, wherein the two insulating clamp 4-1 are hinged at the end part of the insulating pull rod 4-4, the insulating handle 4-3 is hinged at the other end of the insulating pull rod 4-4, and the insulating handle 4-3 pulls the insulating clamp 4-1 to be closed through the insulating pull rope 4-2. As shown in fig. 4, two ends of the insulation pull rope 4-2 are connected with the insulation clamp 4-1, the middle part of the insulation pull rope bypasses the shaft on the insulation handle 4-3, and when the insulation handle 4-3 is pulled, the insulation pull rope 4-2 can be pulled simultaneously to enable the insulation clamp 4-1 to be closed, so that the remote insulation operation is realized.
The method for installing and detaching the line side shielding type grounding end structure comprises the following steps:
1) Firstly, fixing a conductive wire clamp 1 on a wire 5, and then respectively fixing two insulating limiters 2 on two sides of the conductive wire clamp 1, wherein limiting ends 2-3 on the insulating limiters 2 are oppositely arranged;
2) During normal operation, the semicircular arc fixing buckle plate 3-3 and the semicircular arc overturning buckle plate 3-1 are turned over, the linkage block 3-4 on the insulating shielding sheath 3 is clamped by the insulating clamp 4-1 at the end part of the insulating operation rod 4, the insulating shielding sheath 3 is sent to the middle position of the two insulating limiters 2, the opening of the semicircular arc overturning buckle plate 3-1 and the opening of the semicircular arc fixing buckle plate 3-3 are buckled on the limiting ends 2-3 of the two insulating limiters 2 to push the linkage block 3-4, the semicircular arc overturning buckle plate 3-1 rotates, and the semicircular arc overturning buckle plate 3-1 and the semicircular arc fixing buckle plate 3-3 are buckled together and are covered on the outer side of the conductive wire clamp 1;
3) Rotating the linkage block 3-4, screwing the positioning shafts 3-6 on two sides of the linkage block 3-4 into the positioning clamping grooves 3-5 on two sides, and mutually positioning the semicircular arc overturning buckle plate 3-1 and the semicircular arc fixing buckle plate 3-3 which are buckled together;
4) When the grounding is needed, the insulating clamp 4-1 at the end part of the insulating operation rod 4 is used for clamping the linkage block 3-4 on the insulating shielding sheath 3, the linkage block 3-4 is rotated, the positioning shaft 3-4 leaves the positioning clamping groove 3-5, the semicircular arc fixing buckle plate 3-3 is pulled outwards, the semicircular arc overturning buckle plate 3-1 is overturned to expose an opening, and the insulating shielding sheath 3 is taken down.
Claims (3)
1. The circuit side shielding type grounding end structure is characterized by comprising a conductive wire clamp, insulating limiters and insulating shielding jackets, wherein the conductive wire clamp is fixed at a grounding position of a wire, the two insulating limiters are arranged on two sides of the conductive wire clamp and fixed on the wire, the insulating shielding jackets are sleeved outside the conductive wire clamp, and two ends of each insulating shielding jacket are buckled on the insulating limiters;
the conductive wire clamp comprises a hoop, a connecting plate and conductive spines, wherein the connecting plate is fixed on two sides of the hoop, bolt holes are formed in the connecting plate, the conductive spines are fixed on the inner wall of the hoop, and the two conductive wire clamps are mutually buckled on two sides of a wire and are locked and fixed through bolts;
The insulation limiter comprises a fixed end and a limiting end, wherein the fixed end and the limiting end are connected with each other, the diameter of the limiting end is smaller than that of the fixed end, and shaft center through holes matched with the diameters of the wires are formed in the fixed end and the limiting end;
the insulation shielding sheath comprises a semicircular arc fixing buckle plate, a semicircular arc overturning buckle plate and a linkage block, wherein the middle position of the semicircular arc overturning buckle plate is hinged with the end part of the semicircular arc fixing buckle plate, and the linkage block is arranged on the semicircular arc fixing buckle plate;
the semi-arc overturning buckle plate is characterized in that a positioning clamping groove is fixed on the semi-arc overturning buckle plate, a positioning shaft is fixed on the linkage block, the positioning shaft enters the positioning clamping groove through screwing the linkage block, and the semi-arc fixed buckle plate and the semi-arc overturning buckle plate which are buckled together are positioned.
2. The line side shielding type grounding end structure according to claim 1, further comprising an insulation operation rod, wherein the insulation operation rod comprises an insulation jaw, an insulation pull rope, an insulation pull rod and an insulation handle, the two insulation jaws are hinged to the end portion of the insulation pull rod, the insulation handle is hinged to the other end of the insulation pull rod, and the insulation handle pulls the insulation jaw to be closed through the insulation pull rope.
3. A method of installing and removing the line side shield type ground terminal structure as claimed in claim 2, characterized in that; the method comprises the following steps:
1) Firstly, fixing a conductive wire clamp on a wire, and then respectively fixing two insulating limiters on two sides of the conductive wire clamp, wherein limiting ends on the insulating limiters are oppositely arranged;
2) During normal operation, the semicircular arc fixing buckle plate and the semicircular arc overturning buckle plate are turned over, the linkage block on the insulating shielding sheath is clamped by the insulating clamp at the end part of the insulating operation rod, the insulating shielding sheath is sent to the middle position of the two insulating limiters, the opening of the semicircular arc overturning buckle plate and the opening of the semicircular arc fixing buckle plate are buckled on the limiting ends of the two insulating limiters, the linkage block is pushed, the semicircular arc overturning buckle plate rotates, and the semicircular arc overturning buckle plate and the semicircular arc fixing buckle plate are buckled together and are covered on the outer side of the conductive wire clamp;
3) Rotating the linkage block, screwing the positioning shafts on two sides of the linkage block into the positioning clamping grooves on two sides, and positioning the semicircular overturning buckle plate and the semicircular fixing buckle plate which are buckled together;
4) When the grounding is needed, the insulating clamp at the end part of the insulating operation rod is used for clamping the linkage block on the insulating shielding sheath, the linkage block is rotated, the positioning shaft leaves the positioning clamping groove, the semicircular arc fixing buckle plate is pulled outwards, the semicircular arc overturning buckle plate is overturned, the opening is exposed, and the insulating shielding sheath is taken down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910644861.6A CN110474171B (en) | 2019-07-17 | 2019-07-17 | Circuit side shielding type grounding end structure and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910644861.6A CN110474171B (en) | 2019-07-17 | 2019-07-17 | Circuit side shielding type grounding end structure and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110474171A CN110474171A (en) | 2019-11-19 |
| CN110474171B true CN110474171B (en) | 2024-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910644861.6A Active CN110474171B (en) | 2019-07-17 | 2019-07-17 | Circuit side shielding type grounding end structure and use method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN110474171B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004323U (en) * | 2011-04-05 | 2011-10-05 | 太原罗克佳华工业有限公司 | Shield grounding circuit for secondary circuit |
| CN103887620A (en) * | 2012-12-21 | 2014-06-25 | 黄石供电公司变电运行中心 | Fixed-type grounding hook device |
| CN211295399U (en) * | 2019-07-17 | 2020-08-18 | 国网辽宁省电力有限公司朝阳供电公司 | Line side shielding formula ground terminal structure and insulating bar of installation usefulness thereof |
-
2019
- 2019-07-17 CN CN201910644861.6A patent/CN110474171B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004323U (en) * | 2011-04-05 | 2011-10-05 | 太原罗克佳华工业有限公司 | Shield grounding circuit for secondary circuit |
| CN103887620A (en) * | 2012-12-21 | 2014-06-25 | 黄石供电公司变电运行中心 | Fixed-type grounding hook device |
| CN211295399U (en) * | 2019-07-17 | 2020-08-18 | 国网辽宁省电力有限公司朝阳供电公司 | Line side shielding formula ground terminal structure and insulating bar of installation usefulness thereof |
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| Publication number | Publication date |
|---|---|
| CN110474171A (en) | 2019-11-19 |
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