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According to the obvious transient characteristics at the beginning of the fault in the non-effectively grounding distribution system, a new method, based on Hilbert-Huang transform(HHT), is proposed to extract the non-power frequency transient current from the zero-sequence current in distribution networks with a single-phase-to-earth fault. HHT is used to get the amplitude and phase angle of the...
The single-phase grounding fault line selection in the distribution network has always been an outstanding problem of power system relay protection. One of the key reasons for fault line selection difficulty is that the fault current is correspondingly too weak to be detected effectively for the small current grounding system which is widely adopted in our distribution networks. The paper mainly discusses...
For neutrally ungrounded systems, it is very difficult to identify the line experiencing single-phase to ground fault. This is due to the fact that the non-effectively grounded system produces a very small fault current. This paper presents a novel method that can help to overcome this difficulty. The idea is to convert the ungrounded system into a grounded system temporarily through a judicially...
Through a small current grounding system of single-phase grounding to steady state and transient analysis and the existing line selection methods are analyzed and compared, their advantages and shortcomings can be gotten. The line of the selection method in the future was pointed out. The wavelet analysis was introduced to selection methods of faults and the fault lines can be selected in the wavelet...
Due to small grounding current and unstable electric arc at fault position, the faulty circuit selection in resonant grounded systems has always been a complex and difficult problem. This paper proposes a new diagnostic method based on the matter-element and correlation analysis of Extension Theory. The characteristics variables of zero-sequence current and the correlation function have been used...
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