Tower top earthing system through low-impedance cable and limitation method of electric potential at tower top
A grounding system and low-impedance technology, applied in the field of tower top potential limitation, can solve the problems that cannot meet the needs of lightning protection and grounding, and achieve the effect of simple structure
Inactive Publication Date: 2012-06-27
YANGZHOU XINYUAN ELECTRIC
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Problems solved by technology
[0003] The purpose of the present invention is to solve the above-mentioned problem that the traditional direct grounding through the power pole tower cannot meet the needs of lightning protection grounding, and to provide a tower top potential limiting technology that is grounded through a low-impedance cable
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[0030] The present invention is described in further detail below in conjunction with accompanying drawing:
[0031] refer to figure 1 , a grounding system via a low-impedance cable, used for potential limitation at the top of a power tower, which includes a lightning rod, a discharge switch along the surface, the top of a power tower, a low-impedance cable, and a grounding resistor, wherein:
[0032] The lightning rod is connected to the top of the tower and the surface discharge switch, and is used to protect the power tower and nearby facilities, and all lightning strikes within its protection range pass through the lightning rod;
[0033] The surface discharge switch has a spherical structure and is placed on the top 3 of the power tower. The high-voltage end is connected to the lightning rod, and the low-voltage end is connected to the low-impedance cable. Lightning acts on the creeping discharge switch through the lightning rod, and when the voltage exceeds its breakdow...
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The invention discloses a tower top earthing system through a low-impedance cable and a limitation method of electric potential at a tower top. The tower top earthing system comprises a lightning conductor, a surface discharge switch, an electric power tower, a low-impedance cable insulation outer cladding layer, a low-impedance cable shielding layer, a low-impedance cable core line and an earth resistor. The limitation method comprises the following steps: a step of lightning conducting by the lightning conductor, a step of breakthrough of the surface discharge switch, a step of earthing of the tower top through the low-impedance cable and a step of subducting the electric potential at the tower top by reflected wave, wherein the step of breakthrough of the surface discharge switch is as follows: when the electric potential at the tower top is raised to a protective threshold value of the surface discharge switch, and the surface discharge switch is broken through; the earthing step of the tower top through the low-impedance cable is as follows:, after the surface discharge switch is broken through, the tower top is earthed directly through the low-impedance cable; and the step of subducting the electric potential at the tower top by the reflected wave is as follows:, the electric potential is subducted when the reflected wave occurring negative reflection at the earth end of the low-impedance cable reaches the tower top. As the above technical solution is adopted, the problem that flashover occurs because the electric potential at the tower top is too high when the electric power tower or line is subjected to lighting is solved.
Description
Technical field: [0001] The invention relates to a lightning protection and grounding technology for electric power towers, in particular to a tower top potential limiting technology for grounding through a low-impedance cable. Background technique: [0002] EHV and UHV transmission have developed very rapidly in recent years, and several UHV transmission lines have been built from Southwest China to East China and Central China. In mountainous areas with high resistivity, the traditional grounding measures through the power tower itself cannot meet the needs of lightning protection grounding, and lightning strikes often cause the tower top potential to be too high and flashover accidents occur. Therefore, solving the problem of high potential at the top of the tower is a prerequisite for improving the lightning resistance level and safety of transmission lines. Invention content: [0003] The purpose of the present invention is to solve the above-mentioned problem that t...
Claims
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IPC IPC(8): H02G13/00H02H9/06
Inventor 刘轩东张乔根王国利李剑鸣
Owner YANGZHOU XINYUAN ELECTRIC