13 research outputs found
Numerical investigation of influences of liquid types on flow distribution and temperature distribution in disc type ON cooled transformers
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A review of the fundamental dielectric characteristics of ester-based dielectric liquids
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Experimental Study of the Influence of Different Liquids on the Transformer Cooling Performance
No full textMach-cone Shaped Shockwave Characteristics of Gas-to-Liquids Transformer Oil under Positive Lightning Impulse
No full textBubble Formation from Non-Thermally Upgraded Kraft Paper in Alternative Insulating Liquids
No full textBubble formation in transformers could lead to their failure, resulting in severe outages in the electricity network. Hence, understanding the parameters that impact the bubble formation process is crucial to maintain the transformer's dependable operation. Commonly, mineral oil and non-thermally upgraded Kraft paper have been used as the insulating materials for power transformers, and the risk of bubble formation has been studied for this material combination. However, new insulating liquids such as esters and gas-to-liquid technology-based oils are recently gaining more popularity and studies on bubble formation for these alternative liquids are limited. In this paper, the impact of alternative liquids on bubble formation has been investigated by using a small-scale test tube-based system. Studies have shown that when considering the water content in the paper at the time of bubble formation, the bubble formation temperature is comparable across different liquid types.</p
Investigation of Convective Heat Transfer Efficiency in the Horizontal Cooling Duct of a Disc-Type Transformer Winding
No full textNumerical Investigation of Influences of Coolant Types on Flow Distribution and Pressure Drop in Disc Type Transformer Windings
No full textUnderstanding the Temperature Profile of the IEC TS 62332-1 Dual-temperature Ageing Cell
No full textThis paper discusses the challenges faced during the development of a dual-temperature test cell based on IEC technical specification TS 62332-1 to evaluate the ageing performance of transformer insulation systems. A dual-temperature test cell was built based on IEC TS 62332-1 and the performance of the test cell was investigated accordingly. Apart from measuring the conductor and the top liquid temperatures, additional temperature measurements were conducted in other locations including hot solid insulation, cold solid insulation, liquid immersion heaters and test cell surface. Temperature distribution inside the dual-temperature test cell is then analyzed. The results indicate the importance of location of top liquid temperature thermocouples and its effect on the overall temperature distribution. Some additional aspects for maintaining consistency between different test cells are also discussed.</p
