Internal Fault Analysis and Optimization Design of Main Protection Scheme for Shanghai Electric Phase Modifier

doi:10.11930/j.issn.1004-9649.201711222

Abstract

Abstract: Due to the possible stator winding inter-turn short circuit in large phase modifiers, there will be seriously potential risk for the safe operation of the phase modifier without inter-turn short circuit protection. Internal fault analysis and main protection configuration scheme optimization design of a 300 Mvar phase modifier manufactured by Shanghai Electric are carried out with the multi-loop method. The analysis showed that different main protection configuration schemes should be chosen for different outgoing modes of the phase modifier neutral point. Compared with the neutral point outgoing mode and main protection scheme based on the traditional electromagnetic current transformer, the split-phase transverse differential protection based on FOCT will completely change the current status of large turbo-generator without stator winding inter-turn short circuit protection and has little influence on generator design and manufacture, thus providing the high quality guarantee for the safe operation of the generator.

Key words: large phase modifier, inter-turn short circuit, internal fault analysis, split-phase transverse differential protection, flexible optical current transformer

CLC Number:

TM311

GUI Lin, ZHAO Binchao, WANG Guang, WANG Xiangheng, WANG Weijian. Internal Fault Analysis and Optimization Design of Main Protection Scheme for Shanghai Electric Phase Modifier[J]. Electric Power, 2017, 50(12): 33-37.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201711222

https://www.electricpower.com.cn/EN/Y2017/V50/I12/33

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