基于三相三绕组等效网络的变压器绕组扫频阻抗特性研究

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摘要扫频阻抗法在电力变压器绕组变形诊断领域被广泛应用。目前,多基于绕组的简化模型对其进行仿真研究,无法研究变形发生于不同绕组时,扫频阻抗曲线的变化情况。本文针对三相三绕组变压器,建立其完整的三相三绕组等效电阻-电感-电容（RLC）参数模型及简化的单相三绕组RLC参数模型。通过分析上述两个模型的高对中扫频阻抗曲线,发现简化RLC参数模型包含的绕组机械状态信息并不完整。最后,基于完整的三相三绕组模型,研究不同绕组发生短路故障时扫频阻抗曲线的变化趋势并计算其相关系数,分析不同绕组故障对扫频阻抗曲线的影响程度。

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	邢雅
	侯峰
	毛燕荣
	闫敬东
	任富强

关键词 ：扫频阻抗法, 电阻-电感-电容（RLC）参数模型, 短路故障, 相关系数

Abstract：The sweep frequency impedance (SFI) method is widely used in the field of transformer winding deformation detection. At present, most simulation studies on SFI are based on the simplified model of winding, which induces that the changes of SFI curves are hard to be evaluated when faults occur on other windings. Based on a three-phase three-winding transformer, this paper builds its intact three-phase three-winding equivalent resistance-inductance-capacitance (RLC) parameter model and the simplified single-phase three-winding one. By analyzing the high-to-medium SFI curves of the two models, it is found that the simplified single-phase model contains incomplete information about the mechanical condition of the windings. Finally, based on the intact three-phase three-winding RLC parameter model, the variation trends of SCI curves when short-circuit faults occur on different windings are studied and the correlation coefficients are also calculated, so as to assess the influence of the faults of different windings on SFI curves.

Key words： sweep frequency impedance (SFI) method resistance-inductance-capacitance (RLC) parameter model short-circuit fault correlation coefficient

收稿日期: 2022-06-15

作者简介: 邢雅（1989—）,女,硕士,中级讲师,主要研究方向为变电站运行及维护,从事变电运检专业培训工作。

引用本文:

邢雅, 侯峰, 毛燕荣, 闫敬东, 任富强. 基于三相三绕组等效网络的变压器绕组扫频阻抗特性研究[J]. 电气技术, 2023, 24(1): 10-16. XING Ya, HOU Feng, MAO Yanrong, YAN Jingdong, REN Fuqiang. Sweep frequency impedance analysis of transformer winding based on three-phase three-winding equivalent network. Electrical Engineering, 2023, 24(1): 10-16.

链接本文:

http://dqjs.cesmedia.cn/CN/Y2023/V24/I1/10

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