从理论上对变电站用低压交流系统(以下简称"系统")的各种环网故障进行研究,分析了各种环网故障下系统的特征量以及继电保护、自动切换装置(automatic transfer switching equipment,ATS)的动作情况。得出结论:直接影响系统的...从理论上对变电站用低压交流系统(以下简称"系统")的各种环网故障进行研究,分析了各种环网故障下系统的特征量以及继电保护、自动切换装置(automatic transfer switching equipment,ATS)的动作情况。得出结论:直接影响系统的环网故障类型会马上引起继电保护动作;间接影响系统的环网故障类型会引起继电保护误动,扩大故障的影响范围;多相环网故障会造成ATS不能正常投切。指出应尽快研究探测交流环网故障的方法。展开更多
The theories of diagnosing nonlinear analog circuits by means of the transient response testing are studled. Wavelet analysis is made to extract the transient response signature of nonlinear circuits and compress the ...The theories of diagnosing nonlinear analog circuits by means of the transient response testing are studled. Wavelet analysis is made to extract the transient response signature of nonlinear circuits and compress the signature dada. The best wavelet function is selected based on the between-category total scatter of signature. The fault dictionary of nonlinear circuits is constructed based on improved back-propagation（BP） neural network. Experimental results demonstrate that the method proposed has high diagnostic sensitivity and fast fault identification and deducibility.展开更多
文摘从理论上对变电站用低压交流系统(以下简称"系统")的各种环网故障进行研究,分析了各种环网故障下系统的特征量以及继电保护、自动切换装置(automatic transfer switching equipment,ATS)的动作情况。得出结论:直接影响系统的环网故障类型会马上引起继电保护动作;间接影响系统的环网故障类型会引起继电保护误动,扩大故障的影响范围;多相环网故障会造成ATS不能正常投切。指出应尽快研究探测交流环网故障的方法。
基金This project was supported by the National Nature Science Foundation of China(60372001)
文摘The theories of diagnosing nonlinear analog circuits by means of the transient response testing are studled. Wavelet analysis is made to extract the transient response signature of nonlinear circuits and compress the signature dada. The best wavelet function is selected based on the between-category total scatter of signature. The fault dictionary of nonlinear circuits is constructed based on improved back-propagation（BP） neural network. Experimental results demonstrate that the method proposed has high diagnostic sensitivity and fast fault identification and deducibility.
