电力变压器在特快速暂态频率范围内的谐振分析  

Resonance Analysis of Power Transformer Within Very Fast Transient Frequency Range

作　　者：郑一鸣[1] 姚晖[2] 何文林[1] 钱平[2] 张帆[2] 孙翔[1] 

机构地区：[1]国网浙江省电力公司电力科学研究院,杭州310014 [2]国网浙江省电力公司,杭州310007

出　　处：《高电压技术》2017年第6期2024-2032,共9页High Voltage Engineering

基　　金：国家电网公司科技项目(5211DS16000G);国网浙江省电力公司科技项目(5211DS150026;5211DS150028)~~

摘　　要：为改善电力变压器线圈在特快速暂态电压作用下的电压分布,从而提高电力变压器特快速暂态绝缘耐受能力,基于改进的变压器集总参数模型,研究了电力变压器特快速暂态频率范围内的谐振特点。结果表明:采用普通纠结式或改良纠结式线圈作为首端线饼的绕线形式可以有效降低最大响应因子;纠结连续式组合线圈中连续式线段更有可能发生局部振荡,是整个线圈的薄弱环节;最大振荡电压发生的位置大多位于线圈的前半部分,且有效振荡频率越高,最大振荡位置就越靠近首端。研究结果表明在设计变压器时更应关注靠近线圈首端部分的绝缘特性。In order to improve the voltage distribution in power transformer coil and enhance the insulation durability under very fast transient, the resonant features of power transformers within very fast transient frequency range are analyzed based on the improved transformer lumped model. The results show that the interleaved and improved interleaved discs at the top of the winding can reduce the maximum response factors effectively. Continuous segments are the weakest part of the winding where the most serious oscillations may possibly happen. The maximum oscillating voltage is observed at the upper half of the winding, and the position of maximum oscillation moves towards the top of the winding with the effective oscillating frequency getting higher. The research results indicate that the insulating properties near the input port should be more concerned when designing the power transformer.

关 键 词：电力变压器 特快速暂态 高频损耗 谐振分析 局部振荡 响应因子 

分 类 号：TM41[电气工程—电器]