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Dielectric properties of oil-paper insulation transformer are influenced intensively by moisture; therefore, it is imperative to assess integral condition of oil-paper insulation for assuring normal operation of power transformers. As a non-destructive diagnostic technique, return voltage measurements have been introduced for the assessment of water content in transformer pressboard. This paper further...
This paper deals with the effect of distorted overvoltage and current on a transformer terminated at a transmission line through a cable that caused by striking of lightening on transmission line. Also the effect of harmonic current on transformer losses that cause overheating and aging of insulation is discussed. And then the hot spot and top oil temperature under the harmonic conditions using thermal...
In a certain extent, the gas component and content dissolved in the transformer oil indicate the insulation aging and fault degree of the transformer. The fault diagnosis system of transformer based on gas chromatography applies the analysis method of gas chromatography to transform each of the concentration into corresponding electric signal. After data processing, the signal is transmitted into...
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