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中文摘要：
基于主保护不平衡电流有效值的同步发电机励磁绕组匝间短路监测原理解决了依靠单一谐波检测所带来的一系列问题,能够最大限度地提取故障特征量。通过仿真计算,分析了该监测方法对三峡及彭水发电机的灵敏性,并结合实测录波数据分析了影响灵敏性的因素。在此基础上,提出一种考虑固有不平衡电流影响的监测方案,通过移相叠加消除了稳态不平衡电流中的非故障特征分量,进一步提高了监测灵敏性。最后对监测方案的防误判措施、两段式定值整定原则及浮动门槛式动作特性进行了讨论。基于该方案研制的在线监测装置已应用于浙江新安江水电站。
英文摘要：
The monitoring principle of field windings inter turn short circuits based on the unbalanced current root mean square （RMS） value in the main protection overcomes defects of the fault monitoring using the single harmonic detections, and can maximize the fault characteristics information extracted. The sensitivities of the Three Gorges and Pengshui generators are analyzed through simulations. Factors affecting their sensitivities are analyzed with respect to measured data. Based on the analysis, a monitoring scheme considering influences of natural unbalanced currents is proposed. Through phase shift and superposition of the unbalanced current, non-fault characteristic components in the steady-state unbalanced current can be eliminated to further improve the monitoring sensitivities. Anti-malfunctioning measures, a two-segment value setting principle and floating threshold operation characteristics are discussed. An on-line monitoring device manufactured based on the scheme has already been applied in Zhejiang Xin＇anjiang Hydropower Station.
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