Self-arc-quenching parallel gap device
A gap and parallel technology, applied in the direction of spark gap, spark gap parts, overvoltage arrester using spark gap, etc., can solve the problems of increasing accident costs, unfavorable installation and operation, complex structure, etc., and achieve lower protection level and better performance Boost, apply a wide range of effects
Inactive Publication Date: 2015-03-11
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0005] The disadvantages of the existing overvoltage protectors for overhead insulated lines are: 1) It cannot reliably ensure the drainage effect of the lightning current with a large amplitude, that is, it cannot guarantee that the arc can be evenly generated on each drainage needle; After a fault, it cannot be effectively detected and is not easy to be detected, which is not conducive to actual installation and use; 3) The structure is relatively complicated, which is not conducive to mass production; 4) The timeliness and high efficiency of arc extinguishing cannot be guaranteed, which may cause arc damage to insulators and Surrounding equipment causes secondary damage, increasing accident costs
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[0029] The thickness of the insulation of the wire 7 used is 2.5mm, and the cross-sectional area of the wire 7 is 70mm 2 . The arrester 3 used is the zinc oxide arrester used in the power system YH5WS for 10kV distribution network. The shortest distance between the upper and lower electrodes of the gap spherical electrode 2 is 18cm; the insulator 6 used is a single porcelain insulator, the model is P-20T, with two sheds, one large and one small, with a height of 38cm and a maximum diameter of 22cm when viewed from above. The grounding wire 4 of the lightning arrester 3 is reliably grounded, and the spherical electrode part of the gap is correctly aligned to ensure the safety of the test personnel.
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Abstract
The invention discloses a self-arc-quenching parallel gap device, belongs to the technical field of prevention of lightning failures of power transmission lines, and aims to provide a self-arc-quenching parallel gap device of a lightning arrester serial gap spherical electrode, which is additionally arranged on one side of an insulator of the power transmission line so as to reliably dredge lightning current and prevent a permanent fault caused by erosion of an overcurrent point of the power transmission line. According to the technical scheme, the bottom end of a lightning arrester is fixedly connected with the grounding side of the insulator through a bracket; a lower electrode of the gap spherical electrode is fixedly mounted at the top end of the lightning arrester; an upper electrode of the gap spherical electrode is connected with a conductor in a lead wire insulator through a drainage tube; the drainage tube is formed in the way that at least one metal puncture is arranged in a metal tube; the upper electrode and the lower electrode of the gap spherical electrode are perpendicularly aligned; the lower end of the lightning arrester is fixedly connected with one end of a grounding wire, and the other end of the grounding wire is reliably grounded. The self-arc-quenching parallel gap device is mounted on a lead wire to dredge the lightning current.
Description
technical field [0001] The invention relates to a self-extinguishing arc parallel gap device, which belongs to the technical field of lightning fault prevention for power transmission lines. Background technique [0002] At present, various line faults caused by lightning strikes on overhead transmission lines occur from time to time in areas with frequent lightning strikes in the country; at the same time, as the number of overhead lines in my country's distribution network increases faster and faster, the degree of conductor insulation Higher and higher, insulated wires are ablated under the action of lightning, which causes disconnection faults to occur more frequently. Throughout the country, the number of disconnection faults that occur on transmission lines every year is as high as thousands; for overhead transmission lines of 35kV and below, the proportion of line lightning faults is higher, and lightning strikes cause insulator damage and wire disconnection, etc. How...
Claims
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IPC IPC(8): H01T4/10H01T1/16H01B17/46
Inventor 郭润生何彩红王强田义恒宋志勇薛宇
Owner STATE GRID CORP OF CHINA