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| Novel Fault Phase Selector for High Voltage
Transmission Line Protective Relaying Based on Boundary Conditions of Three Sequence
Voltages Xu Qingqiang1£¬2 £¬Suonan Jiale1£¬Yang Lifan3 £¬Mao Peng2 £¬Du Xiaogong4 (1.School of Electrical Engineering£¬Xi'an Jiaotong University£¬Xi'an 710049£¬China£»2.Jiangsu Electric Power Research Institute Corporation Limited£¬Nanjing 210036£¬China£»3.Shanghai AREVA Electric Power Automatization Corporation Limited£¬Shanghai 201315£¬China£»4. Yantai DongFang Electronic Information Industry Corporation Limited£¬Yantai 264001£¬China) Abstract£ºA novel phase selector is proposed for high voltage transmission lines.When
a grounding fault occurs£¬three regions can be judged by the phases¡Mangle between the
zero sequence and negative sequence components of the current. Each region contains a
single phase ground or two phases ground with short fault.The positive£¬ negative and
zero sequence voltages of fault point belonging to the two ground faults can be
calculated. Then the fault phase can be selected by judging whether these voltages of
either fault are concerned with the criteria or not. The selector proposed has excellent
performance under high¡Mresistance ground¡Mfault conditions to avoid the mal¡Moperation
during power swing.The difference of system cases and the inequality between the positive
sequence and negative sequence impedance of the system have no effect on the selector£¬and
the accuracy and effectiveness are verified with realª²time digital simulator. |
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