During the synchronous grid connection test of a small hydropower station after the renovation of the generator protection,3U0 stator grounding protection action occurred,resulting in the tripping of the outlet circuit breaker and the unit shutdown.Analysis of the causes of the ferromagnetic resonance fault shows that voltage transformers with better technical performance and manufacturing quality should be used in the equipment selection and renovation and the cir-cuit design.The iron cores are less prone to saturation in case of disturbance,thus avoiding the ferromagnetic reso-nance.For hydropower stations with the ferromagnetic resonance phenomena,engineering measures can be adopted to effectively eliminate the resonance,including changing the operation mode,adopting the 4PT wiring method,and instal-ling the resonance elimination resistors.
关键词
小型水电站/电压互感器/铁磁谐振/控制措施
Key words
small hydropower station/voltage transformer/ferromagnetic resonance/control measures
维普
万方数据