Research on Electromagnetic Disturbance Intensity Distribution of Substation Based on Traveling Wave Antenna Theory

The electromagnetic environment in AIS substations is complex and variable, the operating arc of isolation switch or lightning intrusion wave can generate extremely strong transient electromagnetic harassment, which seriously affects the performance of sensors. Therefore, analyzing the electromagnetic environment of substations is necessary to improve their anti-interference performance and ensure the safe and reliable operation of the power system. Firstly, based on the theory of traveling wave antenna, the theory of electromagnetic wave refraction and reflection, and the superposition principle, a calculation model of electromagnetic field radiated by transient current waves in complex high-voltage networks considering long conductors and metal shells of equipment is established in this paper; Then a typical 110 kV AIS substation model is simulated by the electromagnetic wave simulation software, and the electromagnetic field distribution at the installation location of common transformer equipment live detection and online monitoring sensors in the substation is analyzed under different transient disturbance scenarios. Based on the above research, the electromagnetic compatibility reliability test parameters of sensors have been clarified, and the installation method of sensors has been optimized to improve the anti-electromagnetic interference ability of sensors in the substation.