The Effects of Moisture on the Characteristics of Oil Immersed Power Equipment Insulation at Low Temperature

Le résumé fourni par la source

Operating in a cold environment, the insulation capacities of oil-immersed power equipment provide significant challenges. Transformers are one of the most important components in an electrical power system to keep it reliable and stable, particularly in colder climates. When the temperature decreases to subzero temperature range, the moisture in the transformer’s oil-paper insulation presents significant variations, directly influencing its insulation performance. Conventional methods for evaluating insulation frequently fail to account for significant moisture fluctuations, leading to potential inaccuracies and compromised operational efficiency. To address this issue, this study conducted extensive laboratory experiments on oil-impregnated pressboard with varying moisture content and aging levels, focusing particularly on how moisture affects dielectric responses at low temperatures. which might lead to in inaccurate and operational performance. To fill this gap, this research performed comprehensive laboratory tests on oil-impregnated pressboard with different moisture levels with different aging degrees, paying special attention to the impact of moisture, relaxation activation energy on dielectric responses at low temperatures. Investigating dielectric properties and moisture transformations at low temperatures with useful estimation techniques. The frequency-temperature shift for relaxation activation energy approach is proposed. The change in transformer oil viscosity causes its dielectric relaxation behavior to change, and the calculated relaxation activation energy needs to be determined through multiple experiments.

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