Study on Automatic Identification of Weak Feed Mode and Faulted Phase Selection of Sequence Component
|School||North China Electric Power University (Beijing)|
|Course||Proceedings of the|
|Keywords||Weak feed Recognition Phase selector Directional power relay|
Continue to occur with the power system operating modes and parameters of the grid have been some changes , this new automatic identification and sequence component fault phase selection reliability of the power system is weak feed . By analyzing the amount of electrical characteristics of the weak infeed side of the fault , zero negative sequence current comparator and automatic identification of negative sequence voltage weak feed . By analyzing the characteristics of single-phase and two-phase ground fault phase selection method zero negative sequence current partition based on the use of positive and negative sequence current ratio method , to improve the ability to withstand transition resistance , an effective solution to the traditional impedance exclude false election phase under heavy load conditions . Meanwhile, the intelligent power directional relay through a given fixed value parameter automatic adjustment operation interval , and improve the reliability of judging the direction , and the with weak feed side and weak feed identification element . Research paper three questions will help improve the performance and adaptability of the relay , the method is simple and effective , with high theoretical and engineering value .