Comparison of partial discharge characteristics and degradation in several polymeric insulators
Comparison of partial discharge characteristics and degradation in several polymeric insulators
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DOI：
10.1049/iet-smt.2011.0226
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发表时间：
2012-11
影响因子：
1.4
通讯作者：
D. Adhikari;D. Hepburn;B. Stewart
中科院分区：
文献类型：
--
作者：
D. Adhikari;D. Hepburn;B. Stewart
聚合物绝缘材料具有优异的电性能，广泛应用于电力设备中。然而，当这些材料受到局部放电(PD)时，它们会被降解，不同的聚合物材料具有不同的PD电阻水平。分析比较了四种不同聚合物--聚醚砜(PES)、聚对苯二甲酸乙二酯(PET)、聚丙烯(PP)和低密度聚乙烯(LDPE)的放电特性和钯引起的放电降解。在每个聚合物样品中产生一个人工孔洞，并在高于局部放电起始电压(PDIV)的情况下施加4h的电场，用COMSOL模拟了每个聚合物材料在各个PDIV处的孔洞内的电场分布，以验证实验结果。很少有工作将空隙的局部放电特性与钯在一系列不同聚合物中引起的材料降解相关联，并随后根据其局部放电电阻对其进行分类。因此，这项研究对每种聚合物的放电脉冲N-Q模式(放电次数与表观电荷测量的曲线图)、放电重复频率以及孔洞表面发生的化学和形态变化进行了比较研究。结果表明，四种聚合物的耐局部放电性能由高到低依次为：LDPE>PP>PET>PES，其中LDPE耐PD能力最强，PES最弱。
Polymeric insulating materials with excellent electrical properties are widely used in electrical power equipment. These materials are degraded, however, when they are subjected to partial discharge (PD) with different polymeric materials possessing different levels of PD resistance. In this study the PD characteristics and degradation caused by PD are analysed and compared for four different polymers – poly(ether sulphone) (PES), poly(ethylene terephthalate) (PET), poly(propylene) (PP) and low-density poly(ethylene) (LDPE). An artificial void is created in each of the polymer samples and electrically stressed above PD inception voltage (PDIV) for 4 h. The simulated electric field distribution inside the void for each of the polymer materials at the respective PDIVs is modelled using COMSOL to validate the experimental results. Little work has correlated void PD characteristics with material degradation induced by PD across a range of different polymers and subsequently categorised them according to their PD resistances. This study therefore presents a comparative study of the N–Q patterns of PD pulses (a plot of the number of discharges against the measure of apparent charge), PD repetition rate and the chemical and morphological changes occurring on the void surfaces for each type of polymer. The results show that the PD resistance of these four polymers can be categorised in a decreasing order according to the following sequence: LDPE, PP, PET and PES with LDPE being most resistant to PD and PES the least resistant.