DIELECTRIC MODELLING AND DIAGNOSIS OF THE OIL-PAPER-INSULATION SYSTEM IN POWER TRANSFORMERS
DIELECTRIC MODELLING AND DIAGNOSIS OF THE OIL-PAPER-INSULATION SYSTEM IN POWER TRANSFORMERS
复制标题
电力变压器油纸绝缘系统介电建模与诊断
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
T. Leibfried
中科院分区：
文献类型：
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作者：
M. Jaya;T. Leibfried
油纸绝缘系统的频域测量为评估电力变压器绝缘层的老化和水分含量提供了新颖的诊断方法[1]。第一步是测量和分析油纸绝缘系统的介电行为及其对温度、水分含量以及油和纸板等中的老化产物的依赖性。本文描述了不同温度和水分含量等参数值下绝缘油和纸板的电导率。然后将这些电导率依赖性纳入绝缘介质的介电模型中，然后将其组合在一起以数学方式复制电力变压器的主绝缘。考虑电力变压器的几何布局，从而获得电力变压器的基本模型。然后将该模型与从运行中的电力变压器获得的 FDS（频域介电谱）测量结果进行比较和验证。
Frequency domain measurements of oil-paper insulation systems provide novel diagnostic methods for assessing the aging and moisture content in the insulation layers of power transformers [1]. The first step is to measure and to analyse the dielectric behaviour of oil-paper insulation systems and their dependence on temperature, moisture content and ageing products in oil and pressboard among others. This paper describes the conductivities of insulating oil and pressboard with different values of parameters like temperature and moisture content. These conductivity dependences were then incorporated into the dielectric model of the insulating medium which were then put together to replicate mathematically the main insulation of power transformers. The geometrical layout of power transformers is taken into account and hence a basic model for power transformers is obtained. The model is then compared and verified with FDS (Frequency Domain Dielectric Spectroscopy) measurements obtained from power transformers in service.