Method for identifying direct lightning strike and inductive lightning strike of transmission line based on direct measurement of traveling wave

Abstract

The invention provides a method for identifying a direct lightning strike and an inductive lightning strike of a transmission line based on direct measurement of a traveling wave. The method comprises the following steps; sampling and measuring the current of the transmission line by using a Rogowski coil; and accurately and concisely identifying whether a lightning strike is a direct lightning strike or an inductive lightning strike by analyzing whether a lightning traveling wave current is bifurcate at a wave tip, whether the polarities of a three-phase lightning traveling wave current are consistent, or the change trend of the amplitude of the lightning traveling wave current. By the method, the direct measurement of the lightning traveling wave is realized, the attenuation and the distortion of the traveling wave are avoided, the transient waveform of the lightning traveling wave current of the transmission line can be recorded completely and accurately, and the identifying accuracy is improved; and the method has the advantages of simple judgment criterion and easy implementation.

Description

technical field [0001] The invention relates to the technical field of identifying types of lightning strikes on transmission lines, in particular to a method for identifying induced lightning and direct lightning strikes on transmission lines based on direct measurement of lightning traveling waves. Background technique [0002] The transmission line is an important part of the power grid and an indispensable connecting element of the power system. Due to the complex and changeable natural conditions such as geological conditions and meteorological conditions in the areas it traverses, there are many factors that may cause failures, so most of the failures in the power system occur on transmission lines. Once a fault occurs, it will not only cause direct damage to the electrical equipment, affect the power supply of the system, but also often directly threaten the stability of the system. [0003] After a fault occurs on a high-voltage transmission line, it is required...

AI Technical Summary

Problems solved by technology

Due to the lack of effective technical means to identify the cause of the fault, and the quality of the line-hunting work is sometimes difficult to control, it is difficult to find the real cause of some accidents

This restricts the improvement of the operation and maintenance level of the transmission line, and directly affects the reliability of the safe operation of the transmission line.

[0004] In the past, the method of line current monitoring was to extract high-frequency signals through the secondary side of the line current transformer, and use the fault recording device to carry out. The traveling wave current of this method is attenuated and deformed due to long-distance transmission, and the traveling wave refraction and reflection in the substation and CT frequency response characteristics will also distort the traveling wave current

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