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转子绕组短路故障时发电机转子不平衡电磁力分析

, PP. 120-127

Keywords: 发电机,转子绕组短路,不平衡电磁力,等效磁通计算方法,磁动势叠加计算方法

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Abstract:

转子绕组短路是发电机常见的电气故障之一,将导致转子振动,危及电机和系统的安全。为了深入分析转子绕组短路故障引起转子振动的成因,提出了一种转子绕组短路故障时转子不平衡电磁力的磁动势叠加计算方法,同时改进了现有的等效磁通计算方法。然后以某火力发电厂QFR—400—2—20型发电机转子绕组短路故障为工程背景,分别利用等效磁通计算方法和磁动势叠加计算方法分析计算了不平衡电磁力,指出由于等效磁通计算方法没有考虑短路位置对不平衡电磁力的影响,当靠近转子横轴的槽绕组短路时,计算得到的不平衡电磁力大于利用磁动势叠加计算方法计算得到的不平衡电磁力。

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