Single-ended ranging method for non-identical phase-cross-line grounding faults of double-circuit lines
A technology for double-circuit lines and ground faults, which is applied in the direction of the fault location, etc., can solve the problems of not obtaining substantive application, failure to provide fault location information, and large error in the ranging result of the impedance method.
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[0020] figure 1 It is a schematic diagram of a double-circuit line power transmission system on the same pole parallel to the application of the present invention. figure 1 Among them, PT is the voltage transformer, CT is the current transformer, m and n are the numbers of the two ends of the parallel double-circuit line on the same pole. The protection device measures the fault phase voltage at the protection installation place of the I-circuit line of double-circuit lines paralleled on the same pole fault phase current and zero sequence current Among them, φ is the fault phase; φ=I circuit line A phase, I circuit line B phase, I circuit line C phase.
[0021] The protection device calculates the zero-sequence current phase angle α of the double-circuit line II line on the same pole:
[0022] α=r 1 + r 2 -π-β
[0023]
[0024] The protection device calculates the zero-sequence current of the double-circuit line II on the same pole Among them, j is a complex n...
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