Early warning method of overhead transmission line lightning strike flashover

Abstract

The invention provides an early warning method of overhead transmission line lightning strike flashover. The method comprises the following steps: (1) when an atmospheric electric field instrument detects that a thundercloud electric field exists near a power transmission line, starting an early warning program; (2) inquiring thunder generation information in a segment of time before present time, setting buffer areas in different distances for the power transmission line, and outputting lightning strike early warning information; (3) according to a power transmission line lightning resistant parameter, determining a dangerous lightning current scope of generating lightning strike flashover, inquiring thunder generation information from early warning beginning time to the present time, and using a lightning strike flashover risk assessment program to determine thunder quantity which is in accordance with the dangerous lightning current scope and calculate a ratio between the thunder quantity and thunder generation amount; (4) if the ratio is larger than 0, emitting early warning information and turning to a step (5); if the ratio is 0, not emitting the early warning information, and turning to the step (5); (5) if detecting that the thundercloud electric field around the power transmission line does not disappear, turning to the step (2), and if detecting that the thundercloud electric field around the power transmission line disappears, ending the early warning program.

Description

technical field [0001] The invention relates to a lightning strike early warning method for transmission lines, in particular to a lightning flashover early warning method for overhead transmission lines, which is suitable for lightning flashover warnings for overhead transmission lines with a voltage level above 110kV in a power system. Background technique [0002] As we all know, lightning can cause a lot of difficulties and inconveniences to human production and life. From ancient times to the present, thunder and lightning have brought serious disasters to human society with its huge destructive power. Today, the power system is an important pillar for the development of the national economy in human society, and the overhead transmission lines used to transmit electric energy are widely distributed and are vulnerable to lightning strikes. According to relevant information, the direct loss and indirect impact caused by lightning strikes are huge. The applicant found i...

AI Technical Summary

Problems solved by technology

The applicant found that this device has obvious deficiencies: it can only monitor the development of thunderstorms, but cannot give the intensity of ground lightning activities, and does not consider the lightning resistance of specific protected objects. Flashover for effective early warning

This method is proposed to overcome the shortcomings of the existing VHF cloud flash multi-station positioning system, which are complicated in equipment, high in cost, phase ambiguity in interferometric positioning, and false alarms in the atmospheric electric field instrument.

The concept is feasible to a certain extent, but the shortcomings are: it does not target specific protected objects, and does not consider the lightning-resistant ability of specific protected objects, so it is impossible to effectively monitor the possibility of lightning flashovers on overhead transmission lines. early warning

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