Ground fault location method for resonant grounded system based on phase voltage and current phase
A single-phase grounding fault and resonant grounding technology, applied in the fault location, detecting faults according to conductor types, etc., can solve the problems of low automation level of single-phase grounding fault, and achieve the effect of no filtering and easy engineering realization.
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[0026] The invention aims to solve the single-phase grounding section positioning problem of the resonant grounding distribution network. It is pointed out that the arc suppressing coil has different influences on the current mutation of the fault phase upstream of the fault point of the fault line at different frequencies, but the current mutation of each phase of the healthy line, the current mutation of each phase downstream of the fault point of the fault line, and the current mutation of the healthy phase upstream of the fault point are The capacitive current under the excitation of the abrupt voltage of each phase is not affected by the arc suppressing coil.
[0027] Taking the resonant grounding system with m outgoing lines as an example, as figure 1 shown, where Indicates the sudden change of each phase current of the mth line, Indicates A, B, C three-phase. Δu represents the abrupt voltage, Indicates the equivalent capacitance to ground of each phase of the mth...
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