Method for locating non-homonymic phase overline earth fault of double-circuit line based on binary search
A double-circuit line and ground fault technology, applied in the direction of the fault location, etc., can solve the problems of rapid discharge of unfavorable faults, rapid recovery of line power supply, influence of mutual inductance on ranging accuracy, and large error in ranging results by impedance method.
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[0030] Such as figure 1 As shown, the protection device measures the fault phase voltage at the installation place of the I-circuit line protection of the parallel double-circuit line on the same pole fault phase current and zero sequence current Among them, φ is the phase A of the I-circuit line, the phase B of the I-circuit line, or the phase C of the I-circuit line. figure 1 Among them, PT is a voltage transformer; CT is a current transformer.
[0031] The protection device calculates the zero-sequence current of the double-circuit line II on the same pole parallel:
[0032] I · II 0 = I · I 0 ( - cos ( r 1 + r ...
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