Using Lumped Parameters to Realize the Single-End Distance Measurement Method of Phase-to-Phase Faults
A single-ended ranging technology for phase-to-phase faults, applied in the direction of the fault location, etc., can solve the problems that the ranging results of the impedance method deviate from the real fault distance, the sampling rate is very high, and the ranging accuracy is affected, and the ranging speed is fast. The principle of ranging is simple and the effect of real-time performance is strong
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[0014] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0015] figure 1 It is a schematic diagram of the line transmission system applying the present invention. figure 1 Among them, PT is a voltage transformer, and CT is a current transformer. The protection device includes a data acquisition system and a data processing system. The data acquisition system of the protection device samples the voltage of the voltage transformer PT and the current waveform of the current transformer CT at the installation place of the transmission line protection to obtain the instantaneous values of voltage and current, and pass Calculation of Fault Phase-to-Phase Voltage at Transmission Line Protection Installation by Fourier Algorithm Negative sequence voltage between fault phases Fault phase current and negative sequence current between fault phases Among them, φφ=AB, BC, CA phase.
[0016] The data acq...
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