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Analysis and Protection of Stator Winding Internal Faults in Synchronous Generator Based on RS Algorithm
Author(s): 
Pages: 48-53
Year: Issue:  6
Journal: TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY

Keyword:  内部故障分形维数RS分析负序功率保护;
Abstract: 基于RS分析方法利用分形维数对同步发电机定子绕组内部故障的稳态和暂态过程进行了研究,通过对计算机仿真数据和动模实验数据的分形维数分析,得出两个有用的规律:故障信号暂态波形的分形维数是内部故障类型的定量表达,且与其频谱分布相关性很强;故障信号稳态或暂态波形的分形维数反映了故障前后电机状态的变化,可以作为电机故障检测的判据,但在实际应用前这种方法必须同其他方法结合.最后,提出了利用分形维数检测发电机异常状态,并使用发电机端部负序功率的流向区别内外故障的新方法.该方法用来检测故障和输出跳变信号的总时间在50Hz信号的半个周期内,能双重区别内外部故障,为发电机定子绕组内部故障保护和诊断提供了新思路,具有很好的应用潜力.
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