Same-tower double-circuit line lightning shielding failure lightning protection performance analysis method considering shielding effect among leads

A technology of double circuits on the same tower, analysis method, applied in the direction of testing dielectric strength, etc., can solve the problem of ignoring the mutual shielding effect of phase conductors

Inactive Publication Date: 2019-03-26
国网甘肃省电力公司超高压公司 +2
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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to solve the problem that the existing electrical geometric model (EGM) ignores the mutual shielding effect between phase conductors when calculating the shielding lightning resistance performance of multi-circuit lines on the same tower

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  • Same-tower double-circuit line lightning shielding failure lightning protection performance analysis method considering shielding effect among leads
  • Same-tower double-circuit line lightning shielding failure lightning protection performance analysis method considering shielding effect among leads
  • Same-tower double-circuit line lightning shielding failure lightning protection performance analysis method considering shielding effect among leads

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[0234] The technical solutions of the present invention will be described below in conjunction with the accompanying drawings and specific examples. However, the invention should not be limited only within the scope of this example.

[0235] Such as figure 1 As shown, a method for analyzing lightning performance of double-circuit lines on the same tower. The analysis method is based on the electrical geometric model of the lightning performance analysis of double-circuit lines on the same tower (see attached figure 2 Shown) as the basis, calculate the conductor exposure distance, the critical lightning current of the conductor at different exposure distances, and the conductor flashover rate. formula based where S FFORC is the flashover probability of shielding, N g is the ground flash density, I cmax is the maximum lightning current around lightning, I c is the shielding lightning withstand level, Z is the exposure distance, and p(I) is the cumulative probability den...

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Abstract

The invention provides a same-tower double-circuit line lightning shielding failure lightning protection performance analysis method considering a shielding effect among leads. An electrical geometricmodel based on same-tower double-circuit line lightning shielding failure lightning protection performance analysis is used to calculate a lead exposure distance, the critical lightning currents of the leads at different exposure distances, and a lead lightning shielding failure flashover rate. According to the magnitude of a lightning current, the same-tower double-circuit line lightning shielding failure lightning protection performance considering the shielding effect among the leads is analyzed based on four conditions. In the analysis method, a mutual lightning shielding failure shielding effect among the leads is considered, and a same-tower double-circuit line lightning shielding failure lightning protection performance analysis model considering the shielding effect among the leads is established, which is an effective supplement to the existing method of calculating the same-tower multi-circuit line lightning shielding failure lightning protection performance.

Description

technical field [0001] The invention belongs to the technical field of lightning protection for transmission lines, in particular to the field of analysis of the shielding lightning resistance performance of double-circuit transmission lines on the same tower, and in particular to a method for analyzing the lightning resistance performance of double-circuit lines on the same tower considering the shielding effect between conductors. Background technique [0002] Overhead transmission lines are the foundation of power grid construction. Since overhead transmission lines are distributed in the wild and stretch for thousands of miles, the terrain and landforms of the areas they pass through are intricate, and the geographical and meteorological conditions are also diverse. The most important factor of tripping, the power grid failure caused by lightning strike line has always been a problem that plagues the stable operation of the system and the safe power supply. my country's ...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 唐凯保承家姜文东谷山强苏杰刘岩万家伟任华雷梦飞章涵
Owner 国网甘肃省电力公司超高压公司
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