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M. A. Talib
Tenaga Nasional Berhad Research
Control & Systems Engineering Electrical & Electronics Engineering

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Frequency response analysis for transformer tap changer damage detection S. Al-Ameri; A. A. Alawady; M. F. M. Yousof; H. Ahmad; Ali. A. Salem; M. A. Talib
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 11, No 1: March 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (485.03 KB) | DOI: 10.11591/ijpeds.v11.i1.pp350-358

Abstract

Frequency response analysis (FRA) method has been proven to detect the transformer winding damage. However, there is no practical study which investigates the damages on transformer tap changer even though it has a high failure rate. Hence, this paper investigates normal and faulty transformer tap changer using FRA. The FRA measurements conducted using four different test configurations. Also, normal tap changer, pitting and coking tap changer contact were investigated. In addition to FRA measurement, winding resistance measurement has been conducted. The transformer turn ratio measurement also conducted to identify the taps positions. This study results significant to understand the effect of pitting and coking tap changer on the transformer frequency response. The results showed that pitting has a slight influence on the frequency response. However, coking shows a huge variation in low-frequency response. This effect observed during the winding resistance measurement.
The effect of short circuit fault in three-phase core-typed transformer N. F. M. Yasid; A. A. Alawady; M. F. M. Yousof; M. A. Talib; M. S. Kamarudin
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 11, No 1: March 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (494.404 KB) | DOI: 10.11591/ijpeds.v11.i1.pp409-416

Abstract

Different techniques for monitoring the transformer condition are continuously discussed. This is due to the fact that transformers are one of the most expensive components in the power system network. Not to mention the cost to fix any failure occurred in the transformer that have becoming more expensive nowadays. Frequency response analysis (FRA) is found to be the best method to monitor the transformer reliability. This paper presents a continuation of study presented in previous paper [1]. The study performed a laboratory test to show that the response of a normal winding phase A can be affected by short circuit fault which occurred at LV winding phase a, b, and c. To further investigate, current paper performed FRA measurement and applied fault on all phases. The same procedure is repeated on a distribution transformer to verify the findings. This is to examine the effect of fault at winding of other phases to the response of measured phase.
Co-Authors A. A. Alawady A. A. Alawady Ali. A. Salem H. Ahmad M. F. M. Yousof M. S. Kamarudin N. F. M. Yasid S. Al-Ameri