ACCURATE WAVEFORM MEASURING METHOD FOR LIGHTNING STRIKE-INDUCED MALFUNCTIONS OF ELECTRICAL TRANSMISSION LINE

摘要

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.