Single-end distance measurement method for single-phase ground fault of double-circuit lines paralleled on the same pole
A single-phase ground fault, double-circuit line 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, failure to provide fault location information, mutual inductance of ranging accuracy, etc.
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[0018] 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 a voltage transformer; CT is a current transformer. 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 Fault phase negative sequence 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.
[0019] The protection device selects the initial value of the fault distance as l x , to calculate the zero-sequence current of the line II of the double-circuit line paralleled on the same pole
[0020] I · I I 0 = ...
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