鲁西换流站高压站用变保护配置存在的问题探讨

Discussion on Existing Problems in Protection Configuration of High Voltage Station Transformer in Lu-xi Converter Station

由于鲁西换流站500 kV 1B高压站用变容量小、阻抗大、高压侧套管变比小,导致了站用变低压侧故障时大差动保护和高压侧断路器失灵保护灵敏度不足。通过对该站用变保护配置存在的问题进行分析,提出了有效的解决措施,大大提高了保护的可靠性和灵敏度。

The sensitivity of differential protection and failure protection of high voltage side circuit breaker in Lu-xi converter station 500kV 1B high voltage station are insufficient during the low voltage side fault of station transformer,because of the 500kV 1B high voltage station transformer’s small capacity,large impedance and small ratio at high voltage side bushing in Lu-xi converter station.By analyzing existing problems in the protection configuration of station transformer,effective solving measures are proposed which greatly improve the reliability and sensitivity of the protection.