CHEN Xia（陈霞）， WANG Jin（王瑾）
(College of Information and Electrical Engineering, Shandong University of Science and Technonlgy, Qingdao 266510, China)
Abstract：Symmetrical components method is employed in analysis of the characteristic motor faults. Motor protection method is put forward based on detecting positive sequence, negative sequence and zero sequence current. And problems of lack of motor overload capacity in existing mining motor protection system, impact of dynamic current on stage and definite-time delay operation and inaccuracy of criterion phase failure protection are analyzed. The unbalanced faults protection and inverse-time overload protection, which can make protection time change with the current movement, are proposed. The above problems can be solved, and the reliability and intelligent of coal shearer are improved.
Key words：symmetrical component method; mining machine; inverse-time protection; protection of motor
CLD number： TP277.3 Document code： A
Article ID： 1674-8042(2012)01-0034-05doi： 10.3969/j.issn.1674-8042.2012.01.008
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