Flexible grounding system grounding fault protection method based on fault phase voltage polarization
A technology of fault phase voltage and grounding system, which is applied in the direction of fault location, measurement of electrical variables, measurement of current/voltage, etc., can solve the problems that the protection method cannot be directly applied, is not comprehensive, and malfunctions, so as to avoid further expansion of accidents and withstand The effect of improving the ability of the transition resistance and avoiding the lack of accuracy
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[0018] Attached below figure 1 to the attached Figure 4 The present invention will be further described.
[0019] as attached figure 1 As shown in the figure, a ground fault protection method for flexible grounding system based on fault phase voltage polarization includes:
[0020] a) After the fault occurs, complete the selection of the faulty phase;
[0021] b) After the neutral point is connected in parallel with the small resistor, if the zero-sequence current at the detection point is greater than or equal to the zero-sequence current demarcation value I bdy Or if the phase difference between the fault phase voltage and the zero-sequence current at the detection point is within the range of -34.8° to 55.2°, it is determined to be an internal fault;
[0022] c) After the neutral point is connected in parallel with the small resistor, if the phase difference between the fault phase voltage and the zero-sequence current at the detection point is within the range of 55.2...
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