Applied Research On Current Transformer For Measuring Lightning Current Based On Transmission Lines

Transmission line tripping accidents is the main fault in the power system operation because of the lightning strike.Accurate measurement is the study of lightning characteristics of lightning parameters,analysis of lightning,the premise of the cause of the accident in power grid has a very important role in the design of lightning protection.In this paper,the main research work includes the following several parts:First of all,the study of the characteristics of the lightning current waveform,the sensor measurement of lightning current waveform on the principle and classification of Rogowski coil are analyzed in theory,the transfer function of Rogowski coil is derived and its equivalent circuit model,analyzed the traditional since the integral type Rogowski coil measurement of lightning current and the reason of the error is put forward to traditional since the necessity of integral type Rogowski coil for correction.Then,based on the integral type Rogowski coil formula derivation and simulation results in MATLAB,respectively based on analog and digital integral compensation is proposed two correction methods,and design a new type of analog integrator,theoretical analysis and the related test for system error;At the same time put forward based on the algorithm of Simpson numerical integral correction methods,analyze the correction effect.Finally,the two correction since the integral type Rogowski coil used in transmission line lightning locating on-line monitoring system for engineering site,the comparison of advantages and disadvantages of two correction scheme of the engineering application and applicable occasions.