In view of fault resistance to the influence of distance protection, a new adaptive distance protection scheme for a transmission line is proposed in this article. First, according to the geometric distribution of the measured phasors in fault conditions, the voltage drop equation is established and the adaptive setting coefficient is defined. On this basis, the angular difference between the fault current and the measured current is calculated according to the negative-sequence and zero-sequence components of the current. Finally, a new adaptive distance protection criterion is established. Simulation tests on the real-time digital simulator 500-kV two-machine system verify that the proposed method is able to modify the protection setting value adaptively on-line, and it is applicable to various fault types with strong immunity to the fault resistance. It is also simple in formation and easy to implement.
A New Adaptive Distance Protection Scheme for a Transmission Line
2016
Article (Journal)
English
three-phase fault , Electrical currents , Electric power lines , single-phase-to-ground fault , adaptive setting coefficient , voltage and current phasor diagram , Simulation , adaptive distance protection , voltage drop equation , Surge protectors , transmission line , fault resistance , phase-to-phase fault , two-phase-to-ground fault
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