Single-phase-to-earth fault line selection method in distribution network based on virtual power comparison principle
A single-phase ground fault and virtual power technology, applied in the direction of the fault location, etc., can solve the problems of weak fault signal, difficulty in online application of the traveling wave method, difficulty in identifying the fault wave head of the fault waveform, etc., and achieve the effect of simple line selection principle
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[0020] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0021] figure 1 It is a flow chart of a line selection method for a single-phase grounding fault in a distribution network based on the virtual power comparison principle applying the method of the present invention. After a single-phase grounding fault occurs on the distribution network lead-out line whose neutral point is grounded by the arc-suppression coil, measure the zero-sequence voltage of the distribution network busbar and the zero-sequence current flowing through each lead-out line of the distribution network; keep the parameters of the arc-suppression coil unchanged and switch in parallel Resistance, measure the zero-sequence voltage of the distribution network busbar, the zero-sequence current flowing through each lead-out line of the distribution network and the zero-sequence current flowing through the parallel resistance; calculat...
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