Realizing the fault distance protection method between phases of line by using distributed parameters
A technology for interphase fault and distance protection, applied in emergency protection circuit devices, electrical components, etc., to solve problems such as the influence 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. , to achieve the effect of stable and reliable operation performance, preventing grid chain tripping accidents, and eliminating the influence of protection operation performance.
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[0014] The technical solutions of the present invention will be further described in detail below in conjunction with the embodiments.
[0015] 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 ; Among them, ΦΦ=AB, BC, CA phase.
[0016] The protection device calculates the line impedance Δz from the transmission ...
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