Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28489
Title: On-site safety evaluation for earth fault in mining power systems
Authors: Zeng, X
Li, KK
Chan, WL 
Yin, X
Issue Date: 2003
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on industry applications, 2003, v. 39, no. 6, p. 1563-1569 How to cite?
Journal: IEEE transactions on industry applications 
Abstract: Many mining power systems utilize ineffectively grounded sources to restrict the residual current of single-phase earth fault in order to reduce outage and shock hazard. In practice, with the system expansion, topology changing, and insulation aging, the potential residual current and zero-sequence voltage for earth fault vary dynamically and some arcing earth faults can easily cause over-voltage and induce multiple faults. In order to improve the system safety, on-site condition monitoring, safety evaluation, and preventive maintenance for earth fault are proposed in this paper. Some techniques for online parameters measurement based on resonance-measurement principle are presented. Power system operation states are classified into normal secure state, alert state, incipient fault state, and fault state. Some security enhancement methods (preventive action and remedial action) for each state are implemented. The prototype for safety evaluation has been developed and installed in industry power systems for several years.
URI: http://hdl.handle.net/10397/28489
ISSN: 0093-9994
EISSN: 1939-9367
DOI: 10.1109/TIA.2003.818994
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