Fault identification method for UHVDC transmission line based on current characteristic quantity
A technology for UHV DC and transmission lines, applied in the direction of fault location, fault detection according to conductor type, etc., can solve problems such as identification methods of unseen faults, and achieve the effect of improving performance
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[0037] Below in conjunction with the accompanying drawings, the present invention is simulated and verified with a simulation model.
[0038] The line model is a ±800kV / 5kA bipolar UHVDC model, and the parameters of the primary circuit are derived from actual projects. The line adopts the frequency-dependent (phase) model, the total length is 1891km, the representative span is 500m, and the sag is 26m. The specific parameters of the tower are as follows: figure 2 shown. The conductor adopts 6 splits, the equivalent radius is 0.4572m, the type is twisted wire, the total number of strands is 52, the number of outermost strands is 21, the radius of each strand is 2.265mm, and the resistance is 0.03984Ω / km. The resistances of ground wires 1 and 2 are 0.4696Ω / km and 0.465Ω / km respectively. The rectifier side adopts constant current control, and the inverter side adopts constant voltage control; the rated firing angle of the rectifier side is 13°, and the rated arc extinguishing ...
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