Modelling the response of transformer winding for deformation analysis

Mohd Yousof, Mohd Fairouz and Saha, Tapan Kumar and Ekanayake, Chandima Modelling the response of transformer winding for deformation analysis. In: Talent Management Symposium (TMS 2012) , 11-12 July 2012, Australia.

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Abstract

Power transformer is one of the most expensive and important equipment in power system network. Its internal component is exposed to possible mechanical damage due to high electromagnetic force of fault current. It is not practical to open the transformer tank merely to perform visual inspection. An effective method for solving this problem is called Frequency response analysis (FRA), which measures the internal condition of power transformer by conducting external measurement. The main challenge for this technique is to understand the measured transfer function response which is still unclear to what actually happen on the internal component. Therefore, it is essential to identify the relation between the mechanical deformation of the winding and its transfer function response. This paper discusses on three methods for modelling the transformer winding frequency response; namely n-ladder network, multi-conductor transmission line (MTL) and hybrid MTL. From the finding, the most suitable method will be used to simulate winding deformation to investigate its response pattern. Firstly, these methods were used to represent an interleaved winding based on end-to-end short circuit configuration of the FRA measurement. The corresponding model parameters were calculated based on winding construction and geometrical information. The frequency response curves of different models were compared with the measured response for verifying the model accuracy. From the comparison, it is found that MTL is the most accurate method to model the transformer winding. Finally, based on the geometrical information of a deformed winding, MTL was applied to simulate the winding response and changes on the pattern were notified. Conclusion can be drawn from these findings that, with a suitable and accurate winding modelling technique, the simulated response of a deformed winding can be obtained.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Frequency response analysis; power transformer; condition monitoring; winding deformation
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA177-185 Engineering models. Engineering economy
ID Code:2823
Deposited By:Normajihan Abd. Rahman
Deposited On:08 Nov 2012 10:54
Last Modified:08 Nov 2012 10:54

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