A Method for Precise Measurement of Lightning Strike Fault Waveform of Transmission Line

Abstract

An accurate waveform measuring method for lightning strike-induced malfunctions of an electrical transmission line, comprising: using a self-integrating, flexible, nonmagnetic cored Rogowski coil (9) to sample and measure the electric current on an electricity transmission line, and designing an correction system for correcting measured values. Different from the traditional correction method of increasing inductance and some current correction methods of using hardware circuitry, the present method utilizes a certain software algorithm to enable the transfer function of the correction system. When acquiring the transfer function of the correction system, first a pulse current generator is used to simulate a square wave output; the Rogowski coil (9) and a shunt resistance are sampled and measured; the input and output of the correction system are acquired on the basis of the correction system backward-restoring the measuring system; the least square method is used to calculate the impulse response of the correction system; a Hankel matrix is used to calculate the order of the transfer function; finally, the least square method is used to identify and solve the coefficient of the transfer function.

Description

technical field [0001] The invention relates to a method for measuring the current waveform of a transmission line, in particular to an accurate measurement method for a lightning strike fault waveform of a transmission line, which is mainly used for correcting the low-frequency distortion problem existing when a self-integrating Rogowski coil measures the lightning strike fault current of a transmission line. Background technique [0002] Due to its wide distribution and large geometric size, high-voltage transmission systems are extremely vulnerable to lightning attacks. Data show that 80% of transmission line faults are lightning strike faults. The measurement and characteristic analysis of the lightning strike fault parameters of transmission lines caused by lightning has become a transmission system security an important topic in the field. [0003] As a non-contact current transformer, the Rogowski coil is widely used in the measurement field of high-current pulses. Th...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is mainly the low-frequency distortion problem of the self-integrating Rogowski coil in the measurement of the lightning strike fault of the transmission line, and a method for accurately measuring the waveform of the lightning strike fault of the transmission line is provided, which corrects the measured value with distortion to achieve Purpose of Accurate Measurement of Lightning Strike Fault Waveform

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