Ultra high-voltage alternating current transmission line protection method based on all-component differential coefficient matrix
A technology of UHV AC and transmission lines, which is applied in the direction of automatic disconnection emergency protection devices, circuit devices, emergency protection circuit devices, etc., and can solve the problems of enhancing the stability of the power grid and failure to correctly jump out of faults, etc.
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[0028] figure 1 It is a schematic diagram for applying the method of the present invention to detect faults of UHV AC transmission lines. The fundamental frequency electrical quantities of the m-side substation and the n-side substation are respectively measured by synchrophasor measurement units (Phase Measurement Unit, PMU) installed in the two substations. The synchronized phasor measurement unit measures the three-phase current of the UHV AC transmission line at the detection point of the m substation And phase A positive, negative, zero sequence voltage A phase positive, negative, zero sequence current Measure the three-phase current of UHV AC transmission line at the detection point of substation n And phase A positive, negative, zero sequence voltage A phase positive, negative, zero sequence current as input.
[0029] Utilize the positive, negative and zero-sequence voltages at the detection points of the m substation And positive, negative, zero seque...
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