Research on Electromagnetic Interference of Smart Device Acquisition Unit under GIS Disconnector Operation

[摘要] With the continuous improvement of substation voltage level and the wide use of GAS insulated SWITCHGEAR (GIS), switching overvoltage, especially the very fast transient overvoltage (VFTO) caused by disconnector operation, has attracted more and more attention. According to the demonstration project of a new generation intelligent substation with the highest voltage grade (330kV) in operation in China, analysing the physical process of VFTO generation and propagation in high voltage substation by combining simulation calculation with test detection. Taking the electronic current transformer of intelligent secondary equipment as an example, its exploitation is established. We got the output signal waveform of the acquisition unit port under the action of VFTO by the high frequency transient model of the unit. By comparing the distribution parameters and the measured signal waveforms, the high frequency characteristics of the acquisition unit of the electronic current transformer under the action of VFTO are reflected. The results show that the EMI of the acquisition unit of electronic current transformer is in the form of pulse group. The amplitude of EMI is about 900V and the stable impact frequency is about 50 kHz. The impact frequency directly related to the arc reburning frequency.

[发布机构] Shaanxi Electric Power Research Institute of State Grid Corporation of China, Xi'an, Shaanxi, China^1;School of Electrical Engineering, Wuhan University, Wuhan, Hubei, China^2;School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China^3;China Electric Power Research Institute, Beijing, China^4;Wuhan NARI Limited Company of State Grid Electric Power Research Institute, Wuhan, China^5

[效力级别] 无线电电子学 [学科分类] 材料科学（综合）

[关键词] Continuous improvements;Distribution parameters;Electronic current transformer;Gas insulated switchgear(GIS);High frequency characteristics;High frequency transients;High voltage substations;Very fast transient over voltage (VFTO)