Line single-phase earth fault distance protection method implemented by aid of distributed parameters
A single-phase ground fault, distributed parameter technology, applied in emergency protection circuit devices, electrical components, etc., can solve the impact of impedance distance protection action performance cannot be ignored, impedance relays have poor resistance to transition resistance, and impedance distance protection Action sensitivity is reduced and other problems, to achieve the effect of stable and reliable operation performance, preventing grid tripping accidents, and eliminating the influence of protection operation performance.
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[0016] The technical solutions of the present invention will be further described in detail below in conjunction with the embodiments.
[0017] 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 ; Among them, φ=A phase, B phase, C phase.
[0018] The protection device calculates the line impedance Δz from the tra...
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