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Internal Fault Analysis and Optimization Design of Main Protection Scheme for Large Condenser

机译:大型凝汽器主保护方案内部故障分析及优化设计

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Large condenser (300Mvar) has the possibility of inter-turn short-circuit in stator windings. Absence of protection against inter-turn short-circuit will be a serious threat for the safe operation of the condenser. Using the Multi-Loop analysis method, internal fault analysis and optimization design of main protection scheme are carried out for two kinds of condenser with different cooling modes. The analysis shows that different main protection schemes should be selected according to the difference in the number of branches per phase of the large condenser. Compared with the main protection scheme based on traditional electromagnetic current transformer, the complete or incomplete split phase transverse differential protection based on flexible optical current transformer will completely solve the problem of imperfect stator winding inter-turn short-circuit protection for large turbo-generator. And the new scheme has very small influence on the generator design and manufacture, thus guaranteeing the safe operation of generators.
机译:大型电容器(300Mvar)可能会导致定子绕组匝间短路。缺乏防止匝间短路的保护措施将对冷凝器的安全运行构成严重威胁。利用多回路分析法,对两种冷却方式不同的冷凝器进行了内部故障分析和主保护方案的优化设计。分析表明,应根据大型冷凝器每相支路数量的差异选择不同的主保护方案。与基于传统电磁电流互感器的主保护方案相比,基于柔性光电流互感器的完全或不完全分相横向差动保护将完全解决大型涡轮发电机定子绕组匝间短路保护不完善的问题。新方案对发电机的设计和制造影响很小,从而保证了发电机的安全运行。

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