电压互感器绕组冲击过电压研究
吕健双1，冯天佑2，文远芳3
1 中南电力设计院，湖北 武汉 430071； 2 湖北省电力公司电力试验研究院，湖北 武汉 430077；
3 强电磁工程与新技术国家重点实验室(华中科技大学)，湖北 武汉 430074
摘 要：电压互感器在冲击电压作用下的电位梯度分布和表面场强分布是其绕组结构和绝缘设计的重要依据。以几种典型方案为例，介绍了如何建立25kV电压互感器的内部模型，计算单元参数，并利用ATP-EMTP电磁暂态计算程序建立仿真模型，得到多种方案的冲击电压分布，分析增设屏蔽层，优化绕制，并接氧化锌电阻片(MOV)等过电压防护措施的作用，为电压互感器绝缘结构的优化设计提供参考。
关键词：电压互感器；冲击电压；绝缘
中图分类号：TM451 文献标识码：A 文章编号：1007-3175(2013)04-0012-05
Voltage Transformer Winding Impulse Over-Voltage Study
LV Jian-shuang1, FENG Tian-you2, WEN Yuan-fang3
1 Central Southern Electric Power Design Institute, Wuhan 430071, China;
2 Hubei Electric Power Testing & Research Institute, Wuhan 430077, China; 3 State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract: Potential gradient distribution and surface electrical field strength distribution of voltage transformer under impulse voltage effect are import basis for its winding structure and insulation design. Taking some typical plans for examples, this paper introduced how to establish 25 kV voltage transformer’s internal model, how to calculate unit parameters, and how to use ATP-EMPT electromagnetic transient calculation program to establish simulation model, to have got impulse voltage distribution of multi-plans. Analysis was made to functions of over-voltage protection measures, such as adding shielding layer, optimizing windings, connecting with metal oxide varistors (MOV), to provide references for optimizing design of voltage transformer insulation structure.
Key words: voltage transformer; impulse voltage; insulation
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