Dissertation
Dissertation > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection > Line Protection

Study on Automatic Identification of Weak Feed Mode and Faulted Phase Selection of Sequence Component

Author YuYue
Tutor HuangShaoFeng
School North China Electric Power University (Beijing)
Course Proceedings of the
Keywords Weak feed Recognition Phase selector Directional power relay
CLC TM773
Type Master's thesis
Year 2010
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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 .

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