Research on Harmonic Characteristic of Electronic Current Transformer Based on the Rogowski Coil

[摘要] The nonlinear load present in the power system will cause the distortion of AC sine wave and generate the harmonic, which havea severe impact on the accuracy of energy metering and reliability of relay protection. Tosatisfy the requirements of energy metering and relay protection for the new generation of intelligent substation, based on the working principle of Rogowski coil current transformer, mathematical model and transfer characteristics of Rogowski coil sensors were studied in this paper, and frequency response characteristics of Rogowski coil current transformer system were analysed. Finally, the frequency response characteristics of the Rogowski coil current transformer at 2 to 13 harmonics was simulated and experimented. Simulation and experiments show that Rogowski coil current transformer couldmeet 0.2 accuracy requirements of harmonic power measurement of power system, and measure the harmonic components of the grid reliably.

[发布机构] China Southern Power Grid EHV Transmission Company, Liuzhou; 545006, China^1;China Electric Power Research Institute, Wuhan; 430074, China^2;China Southern Power Grid EHV Transmission Company, Guangzhou; 510620, China^3;XJ Electric Co., Ltd, Xuchang; 461000, China^4

[效力级别] 电工学

[关键词] Electronic current transformer;Frequency response characteristic;Harmonic characteristics;Harmonic components;Intelligent substations;Rogowski coil sensors;Transfer characteristics;Transformer systems