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In allusion to single-phase-to-earth fault location in coal mine high-voltage distribution network, a new scheme of fault location was proposed, which based on abrupt change of zero-sequence current and grid structure matrix using that zero-sequence current amplitude of fault lines is larger than non-fault lines. In this method, through analysis of amplitude change ratio between the fault lines and...
In order to limit short-circuit current and satisfy the need of relay setting, only part of the 220kV power transformer is grounded, so on the neutrals of ungrounded transformers will appear the over-voltage. Currently the value of over-voltage on transformer neutral point and the corresponding protection strategy is based on theoretical formula, this article use the PSCAD/EMTDC software to calculate...
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...
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