Study of PT fuse meltdown triggered by low-frequency non-linear oscillation in distribution network

Jufang Wei; Chuang Yao; Xiao He; Shunzhi Yu; Han Cui; Xiaoyue Chen; Zhihui Zheng

doi:10.1117/12.2672882

25 April 2023 Study of PT fuse meltdown triggered by low-frequency non-linear oscillation in distribution network

Jufang Wei, Chuang Yao, Xiao He, Shunzhi Yu, Han Cui, Xiaoyue Chen, Zhihui Zheng

Proceedings Volume 12598, Eighth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2022); 125982U (2023) https://doi.org/10.1117/12.2672882
Event: Eighth International Conference on Energy Materials and Electrical Engineering (ICMEE 2022), 2022, Guangzhou, China

Abstract

With the widespread use of cables in distribution networks, the grounding capacitance of 10kV neutral point ungrounded systems increases significantly, generating low-frequency nonlinear oscillations caused by saturation of electromagnetic voltage transformer (PT). It generates large over-currents on the high voltage side of PT, triggering PT fuse meltdown and causing great im-pact on power system safety. Based on the ATP-EMTP platform, the transient process of the 10kV power system after the disappearance of single-phase ground fault is simulated, generating low-frequency nonlinear oscillations. We analyze the causes and influencing factors of system capacitance to ground, zero-sequence resistance value, fault occurrence and disappearance moment on PT fuse meltdown. We also simulate the suppression measures of 4PT wiring and series connection of voltage sensitive resistor at the neutral point of PT high voltage side and compare their measurement accuracy. Finally, a low-frequency nonlinear oscillation test platform for 10kV power system is established to verify the effectiveness of the simulation.

Citation Download Citation

Jufang Wei, Chuang Yao, Xiao He, Shunzhi Yu, Han Cui, Xiaoyue Chen, and Zhihui Zheng "Study of PT fuse meltdown triggered by low-frequency non-linear oscillation in distribution network", Proc. SPIE 12598, Eighth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2022), 125982U (25 April 2023); https://doi.org/10.1117/12.2672882

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