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Electric stresses on transformer winding insulation under standard and non-standard impulse voltages

机译:标准和非标准脉冲电压下变压器绕组绝缘上的电应力

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摘要

This work presents an extension of our previous work on voltage stress analysis of a 3 MVA, 33/11 kV, 3-phase, 50 Hz, Dyn 11 transformer against the application of standard and non-standard impulse voltages. A preliminary comparative study on the variation of maximum voltage to ground and voltage across the coils under different impulse voltages indicated that non-standard impulse voltage waveforms develop higher voltage stress in the windings. They pose high risk and are critical to transformer insulation system. The obtained test results provide the basis for further study of non-standard impulse voltage waveforms and make necessary correction in the existing impulse testing standards. However, to take care of the stringent effect of actual lightning and other impulse voltages occurring in practical field a more detailed study considering a wide variety of non-standard impulse voltage waveforms is aimed to be done in future. (C) 2015 Elsevier B.V. All rights reserved.
机译:这项工作是对我们以前对3 MVA,33/11 kV,三相,50 Hz,Dyn 11变压器的电压应力分析针对标准和非标准脉冲电压的应用的扩展。对最大接地电压和不同脉冲电压下线圈两端电压变化的初步比较研究表明,非标准脉冲电压波形会在绕组中产生更高的电压应力。它们构成高风险,对变压器绝缘系统至关重要。所获得的测试结果为进一步研究非标准脉冲电压波形奠定了基础,并对现有的脉冲测试标准进行了必要的校正。但是,为了照顾实际雷电和其他在实践中出现的冲击电压的严格影响,未来将针对考虑各种非标准冲击电压波形的情况进行更详细的研究。 (C)2015 Elsevier B.V.保留所有权利。

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