Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 33, Issue 5, Pages 2265-2273Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2017.2788047
Keywords
Distribution system; feeder; ineffectively grounded neutral point; kurtosis; probability distribution; single-phase-to-ground (SPG) fault; skewness
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Funding
- National Natural Science Foundation of China [51677060]
- Science and Technology Project of State Grid [5216A016000T]
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In neutral ineffectively grounded distribution systems, a conventional zero-sequence voltage criterion to detect a single-phase-to-ground (SPG) fault event suffers from some drawbacks, and existing fault feeder selection techniques demonstrate low reliability in the field. For improvement, a new protection scheme is proposed in this paper. It is composed of a fault event detection unit and a fault feeder identification unit. Based on data distribution kurtosis of transient zero-sequence current, the former unit is employed to detect whether a SPG fault event has occurred and capture a fault starting moment. According to the behavior of average data distribution skewness, the latter unit is employed to identify which feeder is faulty. Superior to the zero-sequence voltage criterion, the proposed scheme can reliably detect the SPG fault event under a three-phase voltage imbalance condition and intermittent arc grounding fault. Besides, it is also found that the proposed scheme can validly identify a faulty feeder even under high background noises. Case test results indicate that the proposed scheme is able to work well with not only simulation data but also recorded field data, which demonstrates the high value in engineering practice.
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