Overload anti-misoperation and high-resistance line phase-to-phase fault distance protection method
An interphase fault and distance protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as hidden safety hazards of power grid, misoperation or refusal of impedance distance protection, and refusal to operate impedance distance protection, etc., to eliminate the protection action. Influence of performance, prevention of chain trip accident of power grid, effect of strong resistance to the influence of transition resistance
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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-to-phase voltage at transmission line protection installations , fault current between phases and negative sequence current between fault phases , as the input quantity; among them, φφ=AB, BC, CA phase.
[0019] The protection device calculates the line distance Δx ...
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