Partial discharges within two spherical voids in an epoxy resin
Partial discharges within two spherical voids in an epoxy resin
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DOI：
10.1088/0022-3727/46/33/335301
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
H. Illias;G. Chen;A. Bakar;H. Mokhlis;M. Tunio
中科院分区：
文献类型：
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作者：
H. Illias;G. Chen;A. Bakar;H. Mokhlis;M. Tunio
绝缘材料中可能存在空洞，这是由于绝缘制造过程中的缺陷或长期应力造成的。空洞已被确定为绝缘系统中局部放电(PD)活动的常见来源之一，例如在电缆绝缘和电力变压器中。因此，研究绝缘中空洞中的局部放电现象具有重要意义。本文利用有限元分析软件建立了均匀介质材料中两个球形孔洞内局部放电活动的模型，研究了影响局部放电行为的参数。所考虑的参数包括空穴表面电导率、电子产生率以及起始场和消光场。在交流正弦外加电压下，测量了环氧树脂中两个球形孔洞内的放电活度。将仿真结果与测量数据进行了对比，验证了模型的有效性，并确定了影响局部放电行为的参数。对介质材料中单空洞和双空洞的局部放电活度测量也进行了比较，以观察两种情况下测量结果的差异。
A void in a dielectric insulation material may exist due to imperfection in the insulation manufacturing or long term stressing. Voids have been identified as one of the common sources of partial discharge (PD) activity within an insulation system, such as in cable insulation and power transformers. Therefore, it is important to study PD phenomenon within void cavities in insulation. In this work, a model of PD activity within two spherical voids in a homogeneous dielectric material has been developed using finite element analysis software to study the parameters affecting PD behaviour. The parameters that have been taken into account are the void surface conductivity, electron generation rate and the inception and extinction fields. Measurements of PD activity within two spherical voids in an epoxy resin under ac sinusoidal applied voltage have also been performed. The simulation results have been compared with the measurement data to validate the model and to identify the parameters affecting PD behaviour. Comparison between measurements of PD activity within single and two voids in a dielectric material have also been made to observe the difference of the results under both conditions.