Transformers powered electric pumps, fans, and conveyors. Power and speed affect motor voltage. Transformers create voltage for loads. Unfortunately, daily operation reduces transformer performance. The transformer technical evaluation must be repeated by watching performance. This research periodically inspects a high-power transformer in repair and outage at an Indonesian utility facility. Checking maintains user device performance. SFRA measurements in the 5th unit were checked every six years. Measured in 2007 & 2013. SFRA tests transformer windings and cores by injecting low voltage at a specified frequency. If SFRA finds a winding defect, replace or repair the transformer. The transformer winding & core are in excellent condition after SFRA assessment since shrinkage is less than 20% of the its standard percentage. Thus, PT. YTL East Java's 500 kV power transformer requires less maintenance. Power system lost assets and dependability due to transformer failure. This article describes Sweep Parametric Analysis (SFRA) and its use in transformer testing and maintenance. SFRA tests transformer mechanical integrity electrically. SFRA frequency response changes may indicate physical changes within the transformer, which must be discovered and probed.
Key words: Power transformer, sweep frequency, signature curve, Sweep Frequency Response Analysis (SFRA), Power Transformer, High Voltage (HV), Low Voltage (LV).
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