| On-line detecting of transformer winding deformation based on parameter identification of leakage inductance |
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| 作者姓名： | 郝治国 张保会 李朋 |
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| 作者单位： | School of Electrical Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China |
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| 摘 要： | Transformers are required to demonstrate the ability to withstand short circuit currents. Over currents caused by short circuit can give rise to windings deformation. In this paper, a novel method is proposed to monitor the state of transformer windings, which is achieved through on-line detecting the leakage inductance of the windings. Specifically, the mathematical model is established for on-line identifying the leakage inductance of the windings by applying least square algorithm （LSA） to the equivalent circuit equations. The effect of measurement and model inaccuracy on the identification error is analyzed, and the corrected model is also given to decrease these adverse effect on the results. Finally, dynamic test is carried out to verify our method. The test results clearly show that our method is very accurate even under the fluctuation of load or power factor. Therefore, our method can be effectively used to on-line detect the windings deformation.
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| 关 键 词： | 变压器 绕组变形 在线检测 漏电感 参数辨识 |
| 文章编号： | 1671-8267（2007）01-0024-05 |
On-line detecting of transformer winding deformation based on parameter identification of leakage inductance |
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| Hao Zhiguo,Zhang Baohui,Li Peng.On-line detecting of transformer winding deformation based on parameter identification of leakage inductance[J].Academic Journal of Xi’an Jiaotong University,2007,19(1):24-28. |
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| Authors: | Hao Zhiguo Zhang Baohui Li Peng |
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| Abstract: | Transformers are required to demonstrate the ability to withstand short circuit currents.Over currents caused by short circuit can give rise to windings deformation.In this paper,a novel method is proposed to monitor the state of transformer windings,which is achieved through on-line detecting the leakage inductance of the windings.Specifically,the mathematical model is established for online identifying the leakage inductance of the windings by applying least square algorithm(LSA) to the equivalent circuit equations.The effect of measurement and model inaccuracy on the identification error is analyzed,and the corrected model is also given to decrease these adverse effect on the results.Finally,dynamic test is carried out to verify our method.The test results clearly show that our method is very accurate even under the fluctuation of load or power factor.Therefore,our method can be effectively used to on-line detect the windings deformation. |
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| Keywords: | Leakage inductance parameter identification windings deformation on-line monitoring least square equivalent circuit equation |
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