开口变压器法检测交流定子铁心片间短路故障的一致性和抗扰能力提升研究
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作者单位:

1.华电电力科学研究院有限公司;2.华北电力大学(保定)

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TM307

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国家自然科学基金项目(52277048)


Research on consistency and anti-interference ability improvement of open transformer method for detecting short-circuit fault between AC stator cores
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1.Huadian Electric Power Research Institute Co., LTD;2.North China Electric Power University ( Baoding )

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    摘要:

    为解决开口变压器法检测交流电机定子铁心叠片片间短路故障时易因贴合不良造成误判。本文通过理论分析了开口变压器铁心断面与定子齿顶间隙对检测结果的影响规律,提出在原铁心断面上加装绝缘垫片材料,推导验证了绝缘垫片后开口变压器铁心内部磁通对测量过程中贴合不良的耐受性,进一步得到开口变压器的感应电动势特征。随后以QFSN-300-2型汽轮发电机定子作为研究对象进行了二维电磁仿真验证,进一步在一台小型三相异步电机定子铁心上完成了实验验证。研究结果表明:开口变压器法在测量过程中,铁心断面和定子齿顶面的贴合不良对检测结果影响较大,可能导致误判,在开口变压器铁心断面加装一定厚度的绝缘垫片能够大幅减小间隙的影响,提升检测的抗扰能力。

    Abstract:

    In order to solve the misjudgment caused by poor fit when the open transformer method is used to detect the short circuit fault between the stator core laminations of the AC motor. In this paper, the influence of the gap between the core section of the open-ended transformer and the stator tooth top on the detection results is analyzed theoretically. It is proposed to install the insulation gasket material on the original core section. The tolerance of the internal magnetic flux of the open-ended transformer core after the insulation gasket to the poor fit in the measurement process is deduced and verified, and the induced electromotive force characteristics of the open-ended transformer are further obtained. Then, the two-dimensional electromagnetic simulation verification was carried out on the stator of QFSN-300-2 turbine generator, and the experimental verification was further completed on the stator core of a small three-phase asynchronous motor. The results show that the poor fit between the core section and the top surface of the stator tooth has a great influence on the detection results in the measurement process of the open transformer method, which may lead to misjudgment. Adding a certain thickness of insulation gasket to the core section of the open transformer can greatly reduce the influence of the gap and improve the anti-interference ability of the detection.

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引用本文

郭剑雄,王天阔,于龙飞,等. 开口变压器法检测交流定子铁心片间短路故障的一致性和抗扰能力提升研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-26
  • 最后修改日期:2024-05-31
  • 录用日期:2024-06-05
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