| 引用本文: | 田睿,伍珣,成庶,付强,陈特放.非侵入式机车主变压器绕组故障在线诊断方法[J].哈尔滨工业大学学报,2018,50(3):143.DOI:10.11918/j.issn.0367-6234.201703076 |
| TIAN Rui,WU Xun,CHENG Shu,FU Qiang,CHEN Tefang.Non-invasive on-line diagnosis method for winding faults of main transformer in AC electric locomotive[J].Journal of Harbin Institute of Technology,2018,50(3):143.DOI:10.11918/j.issn.0367-6234.201703076 |
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| 摘要: |
| 为在不改变电力机车系统原有结构的前提下实现对主变压器绕组故障的实时检测，提出一种基于分布参数模型的非侵入式交流机车主变压器绕组故障在线诊断方法.首先通过理论分析得到正常情况下主变压器的输入输出电压差ΔV与输入电流i1之间关系ΔV-i1是一个中心位于直角坐标系原点的斜椭圆轨迹，不同类型的绕组故障对应不同的ΔV-i1轨迹.然后基于dSPACE实验平台对诊断方法进行了验证.实验结果表明：匝间短路时，随着短路百分比的增大，椭圆面积不断增大，离心率呈不断减小；轴向位移时，随着故障严重程度增加，离心率呈正上升趋势，而椭圆长、短轴及其面积呈下降趋势；盘间短路时，椭圆短轴减小，倾角变化明显.对比正常情况与故障情况下的ΔV-i1轨迹差别，诊断方法可以准确识别多种绕组故障.
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| 关键词: 交流机车 牵引变压器 绕组故障 在线监测 数字滤波 |
| DOI：10.11918/j.issn.0367-6234.201703076 |
| 分类号:TM922.73 |
| 文献标识码:A |
| 基金项目:国家自然科学基金 (61603062) |
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| Non-invasive on-line diagnosis method for winding faults of main transformer in AC electric locomotive |
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TIAN Rui1,WU Xun1,CHENG Shu1,FU Qiang2,CHEN Tefang1
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(1. College of Information Science and Engineering, Central South University, Changsha 410076, China; 2. School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, China)
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| Abstract: |
| To detect the fault of the main transformer windings for AC locomotive without changing the original structure of the locomotive system, a non-invasive on-line winding fault diagnosis method for the main transformer is proposed. Proved by the mathematical theory, the relationship between ΔV-i1 is a diagonal ellipse whose center is located at the origin of rectangular coordinate system. The related parameters of the ellipse vary with the change of the winding faults. Then, the feasibility and effectiveness of the proposed method are verified by experiment through dSPACE simulations. The results show that with the increase of short circuit percentage, the area of ellipse increases and the centrifugal rate decreases. When the axial displacement is increased, the centrifugal rate increases, while the elliptical length, short axis and its area decrease. When short-disk occurs, the elliptical short axis decreases and the inclination angle changes obviously. By comparing the ΔV-i1 trajectory under normal and fault condition, the fault type and fault level can be determined.
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| Key words: AC locomotive traction transformer winding fault on-line monitoring digital filtering |
