Journal
IEEE ACCESS
Volume 8, Issue -, Pages 144092-144104Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2020.3014179
Keywords
Circuit faults; Power transmission lines; Discrete cosine transforms; Oscillators; Reactive power; Adaptive algorithm; current-voltage characteristics; fault detection; grounding; power system protection; power system reliability; reactive power; transmission lines
Categories
Funding
- National Natural Science Foundation of China [51877185]
- Scientific Research Project of Shihezi University [ZZZC201736B]
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Double-circuit transmission lines play a very important role in electric power transmission. When a line-to-line nongrounded fault occurs on double-circuit transmission lines, for traditional tripping and reclosing methods, tripping of all six phases may cause power system instability, and fixed time autoreclosing may reclose the double-circuit transmission lines to a nonextinguished fault. In this paper, a novel tripping strategy is proposed; when a line-to-line nongrounded fault occurs, some part of the electric power can be transmitted after tripping, and many kinds of nongrounded faults can be equivalent to a single-phase to ground fault. Furthermore, reactive power characteristics are adopted to determine the fault extinction. Finally, an adaptive autoreclosing scheme for line-to-line nongrounded faults on double-circuit transmission lines based on phase-to-phase reactive power is proposed. The accuracy and feasibility of the propose method are verified by relevant simulation experiments, and multiple operation conditions are considered.
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