Line selection method for small current single-phase ground fault based on fast s-transformation
A technology of single-phase ground fault and line selection method, applied in the direction of fault location, etc., can solve the problem of low accuracy, achieve good adaptability, and improve the effect of line selection accuracy
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[0062] In order to verify the effectiveness of the method of the present invention, according to the State Grid Corporation "Technical Specifications for Line Selection Devices for Single-phase Grounding Faults in Small Current Grounding Systems", the principle of the functional test circuit for simulating single-phase grounding faults in small current grounding systems is as follows image 3 shown.
[0063] image 3 Among them, the switch K1 and K2 are opened for the neutral point ungrounded system; the switch K2 is opened and K1 is closed for the neutral point grounded system through resistance; the switch K1 is opened and K2 is closed for the neutral point grounded system through the arc suppression coil. I 1 * and I 1 It is the zero-sequence current terminal of the first feeder (analog distribution network feeder 1), which is connected to the input terminal of the current transformer of the line selection device, I 1 * is the polarity terminal, I 1 It is the non-polar ...
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