Method and device for power frequency inference source live line measurement for mutual inductance line zero-sequence impedance parameter
A technology of power frequency interference and zero-sequence impedance, applied in measuring devices, measuring resistance/reactance/impedance, measuring electricity, etc., can solve the problem of refusal or malfunction, failure to meet the requirements of relay protection accuracy, equipment volume, workload big problem
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[0104] 1. Acquisition and calculation of zero-sequence voltage vector and zero-sequence current vector
[0105] as attached figure 1 Shown, Z ii is the zero-sequence self-impedance of the i-th line, i=1, 2,..., n; Z ij is the zero-sequence mutual impedance between the i-th line and the j-th line, i, j=1, 2,..., n, i≠j; is the zero-sequence current vector value of the i-th line, and are the zero-sequence voltage vector values at the first and last ends of the i-th line, respectively; U · i = U · i ′ - U i ′ ′ is the zero-sequence voltage drop vector value on the i-th line;
[0106] The instantaneous value of the zero-sequence voltage at both ends of each line and branch can be obtained by first collecting the instantane...
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