Surface Partial Discharge Characteristics Under Repeated Positive Triangular High Voltages (1 kV/s)

IF 2.9 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Pantelis N. Mikropoulos;Pavlos K. Samaras
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引用次数: 0

Abstract

In DC insulation systems, surface partial discharge activity is of major concern, in addition to the normal operating conditions, under transient stress conditions relating to energization and de-energization, voltage polarity reversal, and overvoltage surges. In this study, surface partial discharges in a short sphere-plane gap bridged by polymeric insulating surfaces are investigated under positive triangular high voltages. Discharge modes and their salient characteristics as affected by the applied electric field and insulating material are evaluated and discussed based on current measurements. Emphasis is further given to assess the dependence of surface partial discharge activity on the rise and fall of the applied voltage, repeated testing as well as upon surface charging. Surface discharges are initiated in pulse mode at significantly lower voltages than that observed in air alone; however, the stable glow discharge is established and maintained at markedly higher voltages although related to lower continuous current with greater fluctuation, especially for insulating materials with lower relative permittivity. These are attributed to space and surface charges associated with preceding discharges.
重复正三角高电压(1kV/s)下的表面局部放电特性
在直流绝缘系统中,除了正常工作条件外,在与通电和断电、电压极性反转和过电压浪涌有关的瞬态应力条件下,表面局部放电活动是主要关注的问题。在本研究中,研究了在正三角形高压下,由聚合物绝缘表面桥接的短球平面间隙中的表面局部放电。在电流测量的基础上,对外加电场和绝缘材料对放电模式及其显著特性的影响进行了评价和讨论。进一步强调评估表面局部放电活性对施加电压的上升和下降、重复测试以及表面充电的依赖性。表面放电在脉冲模式下启动,电压明显低于单独在空气中观察到的电压;然而,稳定辉光放电是在明显较高的电压下建立和维持的,尽管与较小的连续电流和较大的波动有关,特别是对于相对介电常数较低的绝缘材料。这是由于与前面的放电有关的空间和表面电荷造成的。
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来源期刊
IEEE Transactions on Dielectrics and Electrical Insulation
IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程:电子与电气
CiteScore
6.00
自引率
22.60%
发文量
309
审稿时长
5.2 months
期刊介绍: Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.
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