Voltage amplitude and phase angle measuring method for double-circuit line non-same-name-phase overline grounded fault point
A double-circuit line and ground fault technology, applied to the phase angle between voltage and current, measuring devices, measuring electrical variables, etc., can solve the unproposed and impossible diagnosis of double-circuit line non-identical phase-crossing ground fault types Basis and other issues
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[0020] The present invention will be further described below in conjunction with drawings and embodiments.
[0021] 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. 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 phase A of the I-circuit line or the phase B of the I-circuit line or the phase C of the I-circuit line.
[0022] The protection device calculates the zero-sequence current phase angle α of the double-circuit line II line on the same pole:
[0023] α=r 1 + r 2 -π-β
[0024] in, r 1 = sin - 1 ( a ...
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