Single-phase-to-earth fault distance protection method for overload, anti-misoperation and high-resistance lines
A single-phase-to-ground fault, line distance technology
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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 faulted phase voltages at transmission line protection installations , fault phase current , fault phase negative sequence current and zero sequence current , as the input quantity; among them, φ=A phase, B phase, C phase.
[0019] The protection device calculates the line di...
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