A fast line selection method for single-phase grounding fault in small current grounding system
A single-phase ground fault and small current grounding technology, applied in the field of power systems, can solve the problems of small 5th harmonics, difficulty in selecting wavelet bases, difficulty in proposing, etc., low requirements for achievement, low storage space requirements, and improved correct line selection sexual effect
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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0029] Such as figure 2 The simulation model diagram of a 110kV / 10.5kV small current grounding system is shown, S is the 110kV power supply, and the 10kV bus has four 10kV feeders, each with a certain load. That is, not grounded or grounded through the arc suppression coil. Line 1 is a cable line, Line 2 is an overhead line, Line 3 is an overhead line, and Line 4 is a cable line.
[0030] The fault point is set at f on line 1 which is 1km away from the 10kV bus, and the fault time is 0.102s respectively. In order to verify that the method of the present invention is basically not affected by line length, transition resistance, and arc suppression coil, the following five situations are set:
[0031] Case 1: The length of line 1 is 3km, the length of line 2 is 15km, the length of line 3 is 1km, the length of line 4 is 2km, the transition re...
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