Method and device for evaluating risks of tripping of low-voltage distribution line in lightning induction
A technology for low-voltage power distribution and risk assessment, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., to achieve easy-to-obtain results
Active Publication Date: 2014-12-10
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID +1
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Problems solved by technology
Before formulating lightning protection measures, it is necessary to understand the risk of tripping of low-voltage distribution lines after being subjected to induced lightning, but there is no perfect method to evaluate this risk at present
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Embodiment Construction
[0019] The invention reflects the tripping risk through the tripping frequency, and provides a reliable basis for formulating and evaluating lightning protection measures for low-voltage power distribution lines. The present invention will be explained in detail below by taking a 10kV power distribution line as an example and in conjunction with the accompanying drawings and embodiments.
[0020] Since my country's ≤60kV voltage level power grid generally adopts the neutral point non-direct grounding method, after a phase insulation flashover, the grounding current is very small, the arc can self-extinguish quickly, and will not cause tripping, and the line can continue to distribute power. If a two-phase insulation flashover occurs, a phase-to-phase short circuit will be formed, the line will trip, and the power distribution will be interrupted.
[0021] figure 1 It is a schematic diagram of the induced lightning overvoltage generated when lightning strikes the ground near t...
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The invention discloses a method for evaluating risks of tripping of a low-voltage distribution line in lightning induction. The method includes the steps: firstly, acquiring relevant parameters; and then, substituting the acquired parameters to a specific formula, and using a lightning induction tripping frequency as an evaluative criteria for measuring the lightning induction tripping risks, so as to provide a reliable basis for formulation, evaluation and the like of lightning protection measures for the low-voltage distribution line. By the aid of the method for evaluating the risks of tripping of the low-voltage distribution line in lightning induction, data required to be acquired are easy to obtain, complicated operation is not involved in the whole process, and the obtained tripping frequency can accurately reflect the tripping risks. The invention further discloses a device for evaluating the risks of tripping of the low-voltage distribution line in lightning induction, and the device corresponds to the method. The risks of tripping in lightning induction can be evaluated by means of combination use of the method with the device.
Description
technical field [0001] The invention relates to the technical field of lightning protection for distribution lines, in particular to a method and device for evaluating the risk of lightning-induced tripping of low-voltage distribution lines. Background technique [0002] According to the location of the lightning strike point, the lightning strikes suffered by the distribution line can be divided into direct lightning strikes and induced lightning strikes. Research data show that lightning accidents on distribution lines account for 70-80% of lightning accidents in the entire power system, of which more than 80% are caused by induction lightning, and about 20% are caused by direct lightning strikes. Among distribution lines of various voltage levels, low-voltage (such as 6kV, 10kV) distribution lines are especially prone to lightning tripping accidents due to the low insulation level. It can be seen that tripping accidents caused by induction lightning on low-voltage distri...
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IPC IPC(8): G01R31/00
Inventor 林伟坚邹俊英唐军刘刚李恒真席宇刘晓庭陈泽兴吴昊疆刘耀晋李懂懂
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID