Analysis of the 220kV main transformer gap discharging accident

Shan Li; Yuan Zhang

doi:10.1117/12.2634856

25 April 2022 Analysis of the 220kV main transformer gap discharging accident

Shan Li, Yuan Zhang

Proceedings Volume 12244, 2nd International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2022); 122444D (2022) https://doi.org/10.1117/12.2634856
Event: 2nd International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2022), 2022, Guilin, China

Abstract

220kV system as the transmission network, its performance is directly related to the safe use of electricity customers. The neutral point occurred in 220kV substation in the air gap breakdown accident phenomenon by tracing back to the time of the accident the sequence of failures the double bus double combined substation variable connection mode the overvoltage calculation and simulation. The simulation results and on-site analysis show that the main reasons of the accidents is A-phase short-circuit grounding of 220kV line caused by guano flashover, which transient voltage and short circuit current made main transformer neutral point broke down, and the protection device trips the three-side circuit breaker of the main transformer. A solution scheme for extending gap action setting time was proposed, which was fit for the time limit of line reclosing protection, in order to avoid the similar accidents.

Citation Download Citation

Shan Li and Yuan Zhang "Analysis of the 220kV main transformer gap discharging accident", Proc. SPIE 12244, 2nd International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2022), 122444D (25 April 2022); https://doi.org/10.1117/12.2634856

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