摘要
为了在线检测电力变压器绕组变形,及时发现运行变压器潜伏性故障,结合频率响应法的基本原理和变压器绕组在运行期间遭受站内过电压冲击特性,提出了基于暂态过电压特性的绕组变形故障在线检测方法。基于耦合电容原理,通过有限元软件仿真技术,研制了用于在线获取过电压信号的传感器,并进行了相关性能实验测试。与此同时,开展了模拟绕组不同故障类型、故障程度和故障位置的试验。结果表明:研制的110 k V和10 k V过电压传感器均满足过电压信号的在线测量要求,分压比分别为109 723和10 231,响应时间<50 ns;绕组试验中不同故障类型绕组的频率响应曲线体现出差异性,不同故障程度和故障位置绕组的频率响应曲线体现出规律性。频率响应曲线波峰波谷变化能综合反映绕组故障信息,从而确定了提出的绕组变形故障在线检测方法具备实际在线应用的潜力。
In order to realize online detection of transformer winding deformation and to excavate latent faults inside transformer, combining with the theory of frequency response analysis, we proposed a new online method to detect winding deformation based on the characteristics of transient overvoltage. We developed a voltage sensor, which is used to measure overvoltage when the transformer is in service, based on the principle of coupling capacitor and finite element method（FEM） simulation technique, and then conducted corresponding performance tests. Meanwhile, the simulated fault winding tests with different fault types, fault degrees, and fault positions are conducted. The test results show that both the developed 110 k V and 10 k V voltage sensors are capable of detecting overvoltage when the transformer is in service, with the voltage divider ratios of 109 723 and 10 231, respectively, and the response time less than 50 ns. Moreover, the frequency response curves show diversities in different faults type tests, and show regularities in different faults degree and faults location winding tests. The peaks and troughs of frequency response curves could reflect the information of winding faults, which indicates that the proposed online detection method has potential to be practically implemented.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第3期873-880,共8页
High Voltage Engineering
基金
国家自然科学基金(51377175)~~
关键词
电力变压器
绕组变形
暂态过电压
频率响应
有限元
耦合电容
在线检测
power transformer
winding deformation
transient overvoltage
frequency response
finite element method
coupling capacitor
online detection
作者简介
姚陈果,1975-，男，博士，教授，博导,从事电气设备在线监测与故障诊断技术、生物医学中的电工新技术及高电压新技术研究,E—mail：yaochenguo@cqu．Edu．Cn
赵伸勇,1988-，男，博士生主要研究方向为电气设备在线监测与故障诊断及脉冲功率技术,E—mail：zhaozhongyong@cqu．Edu．Cn
李成祥,1980-，男，博士，副教授,从事电气设备在线监测与故障诊断技术、生物医学中的电工新技术及高电压新技术研究,E—mail：lichengxiang@cqu．Edu．Cn
陈晓晗,1989-，女，硕士生,2012年于重庆大学获得学士学位，现为重庆大学在读硕士生，主要研究方向为电气设备在线监测与故障诊断,E-mail：chenxiaohan@cqu．Edu．Cn
