Distribution network cable single-phase ground fault distance measuring method utilizing transient main frequency component
A technology of fault distance measurement and phase-to-grounding, applied in the direction of the fault location, etc., can solve the problems of difficult signal extraction, weak steady-state residual current, etc.
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[0054] The present invention will be further described below in conjunction with accompanying drawing:
[0055] The present invention comprises the following steps:
[0056] Step (1), sampling the three-phase transient current signal i at the head end (M end) of the faulty cable line MA (t), i MB (t), i MC (t) and the three-phase transient voltage signal u MA (t), u MB (t), u MC (t). The sampling frequency of the data is 10kHz, and the time window is the half cycle (10ms) after the fault;
[0057] Step (2), calculate the 0-mode component u of the voltage at the head end of the faulty cable line M0 (t) and the 0-mode component i of the current M0 (t):
[0058] ①. In step (1), the first-end three-phase transient voltage signal sequence value u of the faulty cable line obtained by sampling MA (t), u MB (t), u MC (t) Perform Karenbuaer phase-mode transformation to obtain the 0-mode component u of the voltage at the head end of the faulty cable line M0 (t), the specifi...
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