改进的低压脉冲法对变压器绕组变形的探测研究  

Research in detection of winding transformer variation based on improved LVI method

作　　者：李宏达[1] 黄鼎琨 张彬 陈乃川 Li Hongda;Huang Dingkun;Zhang Bin;Chen Naichuan(School of Equipment Engineering,Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学装备工程学院

出　　处：《南京理工大学学报》2020年第1期15-20,共6页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(51974063);广州供电局项目(GZGD20180303240048)

摘　　要：为了保证大规模电力输送工作的质量和效率,提高电力输送设备的使用寿命,通过对电网内核心装置电力变压器的内部绕组进行了变形探测研究。根据以往常用的低压脉冲法与频响法的优缺点,提出了一种基于低压脉冲法的改进方法。利用纳秒级脉冲进行测量来诊断电力变压器内部绕组的状态,即采用持续时间为100~2000 ns和上升沿大约10 ns的纳秒级脉冲发生器进行测量。通过在不同端子上进行对比测量,并根据不同端子间回波信号的差异来判断变压器内部绕组是否发生了形变。此种方法确保了良好的重复性和测量精度并改进了传统的低压脉冲法(Low voltage impulse,LVI)的缺陷。实验结果证明,开发的纳秒级脉冲源与针对变压器绕组变型的数值谱分析法,可以快速地得到变压器内部绕组的变型情况并且扩展了回波信号的频谱。In order to ensure the quality and efficiency of large-scale power transmission,improve the service life of power transmission equipment,the deformation detection of the inner windings of power transformers is studied.According to the advantages and disadvantages of the low voltage pulse method and frequency response method,an improved method based on low voltage pulse method is proposed.Nanosecond pulse is used to diagnose the internal winding state of power transformers,that is,a nanosecond pulse generator with a duration of 100~2000 ns and a rising edge of about 10 ns is used for measurement.Through the comparison measurement on different terminals,and according to the difference of echo signal between different terminals,the winding inside the transformer is judged whether there is deformation or not.This method ensures good repeatability and measurement accuracy and improves the shortcomings of the traditional low voltage impulse(LVI)method.Experimental results show that the developed nanosecond pulse source and the numerical spectrum analysis method for transformer winding variation can quickly obtain the transformer internal winding variation and expand the spectrum of echo signal.

关 键 词：纳秒脉冲 低压脉冲法 绕组变形 电力变压器 频谱分析 

分 类 号：TM417[电气工程—电器]