Zero-sequence voltage protection method for single-phase ground fault of transmission line
A single-phase ground fault, transmission line technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of affecting the action performance of impedance relay, the sensitivity of impedance distance protection action is reduced, and the influence of impedance distance protection action performance cannot be ignored.
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[0017] The technical solutions of the present invention will be further described in detail below in conjunction with the embodiments.
[0018] figure 1 It is a schematic diagram of the line transmission system applying the present invention. figure 1 CVT is a voltage transformer, and CT is a current transformer. The protection device samples the voltage of the voltage transformer CVT and the current waveform of the current transformer CT at the installation place of the transmission line protection to obtain the instantaneous value of the voltage and current, and then the protection device uses the Fourier algorithm for the collected instantaneous value of the voltage and current Calculation of fault phase negative-sequence voltage at the installation of transmission line protection , fault phase negative sequence current , zero sequence voltage and zero sequence current ; Among them, Φ=A phase, B phase, C phase.
[0019] The protection device calculates the equival...
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