Power distribution network single-phase earth fault differentiation processing and fault area isolation method
A technology for single-phase ground faults and fault areas, which is applied to the fault location, detects faults according to conductor types, and electrical components. It can solve problems such as cutting off fault lines, failure of zero-sequence protection, and threats to personal safety at fault points to improve safety. performance, improve the reliability of power supply, and reduce the scope of fault power outages
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[0018] The complete device consists of dynamic intelligent resistance grounding device, feeder zero-sequence protection, feeder node zero-sequence current sensor, feeder node intelligent switch and control system. During the normal operation of the distribution network, the dynamic intelligent resistance grounding device works in the medium resistance grounding mode, and detects the neutral point voltage U of the distribution network in real time. 0 and the zero-sequence current i of each feeder j0 . When the distribution network neutral point displacement voltage U N ≥U 0 +ζ, and U Q ≤ U N GL , the zero-sequence current of any feeder satisfies I jmax0 ≥I j0 +η, judging that a high-impedance ground fault occurs in the distribution network, delay ΔT 1 Finally, check the neutral point displacement voltage of the distribution network and the zero-sequence current of the feeder, such as U N 0 +ζ, and I jmax0 j0 +η, the fault is a transient fault, and the fault has been re...
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