油纸绝缘结构的空间电场测量技术及应用评述  

Review on the Measurement Techniques for Space Electric Field in Oil-Paper Insulation and Their Application

作　　者：李成榕[1,2] 齐波[1,2] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [2]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《南方电网技术》2013年第2期1-9,共9页Southern Power System Technology

基　　金：国家自然科学基金项目资助(51107038);中央高校基本科研业务费专项资金资助(12ZP06)~~

摘　　要：换流变压器是高压直流输电系统的核心设备,其绝缘设计的有效性与合理性十分关键。就换流变压器油纸绝缘空间电场而言,目前的研究多集中在其不同运行工况下的数值计算方法,但其有效性与准确性缺乏有效的空间电场强度实测数据的支持,因为油纸绝缘中空间电场的测量方法一直是测量研究中的难点问题。针对可以应用到油纸绝缘空间电场测量的模拟实验法、Pockels效应法和Kerr效应法等三种测量技术的现状及其应用的情况展开评述,认为Kerr效应法具有不引入其他介质、不改变原有电场的分布、响应时间快以及可以进行二维电场测量的优点,在油纸绝缘空间电场的测量中具有较大的潜力。基于Kerr效应的研究发现,在不同极性直流电压下油纸绝缘空间电场的暂态和稳态特征差异显著,极性效应明显。这或许是由于油纸绝缘中界面电荷在直流电场作用下的产生过程及影响因素存在特殊性所致,而利用目前应用广泛的RC模型则难于对此做出合理的解释。Converter transformer is the core of an HVDC system, and the effectiveness and rationality of its design are the key to the system. In terms the space electric field in oil-paper insulation, most of the existing researches focus on the calculation methods under its different operation settings, but the effectiveness and accuracy of these calculations, however, are short of evidence-based proof from actual measurement data as so far it is a hard issue to measure the field. Aiming at the three measurement techniques for the field, i.e. the experimental analogy method, Pockels effect method and Kerr effect method, this paper makes a review on their status of development and application, arguing that the Kerr effect method appears to be more advantageous and in greater potential of the measurement in the reasons of its involving no additional media, leading to no change to the original electric field distribution, responding more quickly and being capable of two-dimensional measurement. The researches in the field with Kerr effect method indicate that the characteristics of the transient state can be differentiated from that of the stationary state under the direct current of different polarities. This is possibly attributed to the particularity of the interface electric charge development and its affecting factors in the context of a direct current electric field, but hard to explain rationally with the widely-used RC model.

关 键 词：油纸绝缘 空间电场 测量技术 

分 类 号：TM937.1[电气工程—电力电子与电力传动]