Method for identifying properties of lightning faults of overhead line on basis of amplitude interval distribution of lightning current

Abstract

The invention relates to a method for identifying properties of lightning faults of an overhead line on the basis of the interval distribution of lightning current amplitude and belongs to the technical field of a high voltage. After the overhead line has a lightning tripping fault, fault information such as a grounding resistance of a fault tower, characteristic parameters of a tower rod, positioning information of a lightning monitoring system, topographic parameters and the like are collected; according to a circuit lightning protection performance algorithm and a shielding failure electrical geometric model principle, the counterattack lightning withstand level of the circuit suffering from lightning stroke and the amplitude distribution interval of the shielding failure critical lightning current are calculated by integrating a statistics rule of structural parameters of the tower and the line; and finally, the occurrence probabilities corresponding different lightning fault types of the line are obtained by utilizing a line lightning fault property judgment probabilistic algorithm model. According to the invention, the objective and reliable lightning fault type occurrence probabilities are obtained by utilizing the lightning fault property judgment probabilistic algorithm model; a judging result contains a certain fault-tolerant margin; the aims that information amount required by the lightning fault property judgment is small and the fault information is easy to acquire by operation and maintenance personnel of the line are fulfilled; and the judgment method is simple and rapid and has strong practicality.

Description

technical field [0001] The invention relates to a method for identifying types of lightning strike faults on overhead lines, in particular to a method for identifying properties of lightning strike faults on overhead lines based on the interval distribution of lightning current amplitudes, and belongs to the high-voltage technical field. Background technique [0002] In overhead transmission line tripping faults caused by lightning strikes, the judgment of counterattack and shielding is the basis for realizing targeted and differentiated lightning protection, and is an important basis for lightning protection transformation of overhead power lines. And operation and maintenance workers are particularly important. At present, there are three mainstream methods for identifying the nature of line lightning strike faults. One is to use the waveform high-speed acquisition device at the line protection installation to collect line lightning strike overvoltage waves, and use signal...

AI Technical Summary

Problems solved by technology

At present, there are three mainstream methods for identifying the nature of line lightning strike faults. One is to use the waveform high-speed acquisition device at the line protection installation to collect line lightning strike overvoltage waves, and use signal processing methods to analyze and process the voltage traveling waves to find the line. The difference in the time-frequency domain of the overvoltage traveling wave during shielding forms the identification criterion for counterattack shielding. Similar research is like the published document "Intelligent Identification Method for Lightning Shielding and Counterattack of Transmission Lines Considering Impulse Corona" [High Voltage Technology, 2011,37(5)], patent "A method for identification of shielding and counterattack of AC transmission lines" [Patent No.: ZL 200810058558.X], such methods are heavily dependent on the sampling frequency band and signal processing of the waveform acquisition device The correct selection of means, and the judgment link is complicated, so it is difficult to popularize and use it in power lines at present

The second method is based on the principle that the shunting channels of lightning current are different when counterattack or shielding strikes occur on the line. The Rogowski coil, magnetic steel rod and other impact current sensor devices installed on the line or tower are used to record the shunting path of lightning current. Determine the corresponding criteria to realize the identification of the nature of lightning strike faults. Similar studies such as the published papers "Discrimination of Shielding and Counterattack of Transmission Lines Based on Magnetic Tape Measurement" [Modern Electric Power, 2008, 25 (6)], "Based on Rogowski Coils for High-voltage Transmission Lines Recognition of lightning shielding and counterattack" [Gao Electric Switch, 2010 (1)], the realization of this kind of method is greatly affected by the operation stability of the impact current sensor

This method does not consider the randomness of the lightning strike line, and the conclusion of counterattack or shielding is only based on simulation analysis, and there is no appropriate fault tolerance margin

Images