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Interpretation of Inter-Turn Fault in Transformer Winding Using Turns Ratio Test and Frequency Response Analysis

Ali Salman Abdul Razzaq 1, Mohd Fairouz Mohd Yousof 1, Salem Mgammal Al-Ameri 1, Mohd Aizam Talib 2, and Ali Jber Mshkil 3
1. Universiti Tun Hussein Onn Malaysia, Parit Raja, Malaysia
2. TNB Labs Sdn. Bhd., Kajang, Malaysia
3. University of Misan, Misan, Iraq
IJEETC 2022 Vol.11(3): 218-225
doi: 10.18178/ijeetc.11.3.218-225

Abstract—The transformer is critical equipment in electrical power systems as it is continuously exposed to various failures. Inter-turns fault in the transformer reduces the turns of the winding, thus it can be detected using a transformer-turns-ratio (TTR) test. On the other hand, the Frequency Response Analysis (FRA) method is used for assessing the mechanical condition of the transformer winding and core. In this paper, the TTR, and FRA methods are proposed to detect the inter-turns fault in the transformer winding. The winding inter-turn fault was investigated using FRA inductive inter-winding measurement and compared with the TTR test. Findings from the statistical analysis showed that FRA inductive inter-winding can detect the inter-turn fault. Finally, acceptance limits for the absolute sum of logarithmic error and standard deviation were proposed. The limits were established based on TTR’s acceptance limit from the IEEE standard. This finding proves that the FRA test can be used to complement the result in the conventional TTR test.
 
Index Terms—Frequency response analysis, inter-turn, power transformers, short circuit, transformer turns ratio

Cite: Ali Salman Abdul Razzaq, Mohd Fairouz Mohd Yousof, Salem Mgammal Al-Ameri, Mohd Aizam Talib, and Ali Jber Mshkil, "Interpretation of Inter-Turn Fault in Transformer Winding Using Turns Ratio Test and Frequency Response Analysis," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 11, No. 3, pp. 218-225, May 2022. Doi: 10.18178/ijeetc.11.3.218-225

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