变压器绕组变形在线监测方法  

An on-line monitoring method for transformer winding deformation

作　　者：林琳 孙新凤 马超 Lin Lin;Sun Xinfeng;Ma Chao.(State Grid Jibei Electric Power Company Limited Skills Training Center, Baoding 071051, China)

机构地区：[1]国网冀北电力有限公司技能培训中心

出　　处：《电子测量技术》2018年第3期32-36,共5页Electronic Measurement Technology

摘　　要：短路电抗是反映变压器绕组变形的重要依据，文中将基于奇异值分解（SVD）的总体最小二乘旋转不变信号参数估计技术（TLS-ESPRIT）与扩展Prony算法结合，提出了一种新的变压器绕组变形在线监测方法。其中SVD可以理想地滤除电气信号中的噪声，确定电气信号中的谐波个数，TLS-ESPRIT能减少噪声干扰，准确提取各谐波频率，然后通过谐波分析的短路电抗法计算变压器的短路电抗，最终实现对绕组变形的实时在线监测，最后仿真验证了该方法的有效性和实用性。Short circuit reactance is an important basis for reflecting the deformation of transformer winding. In this paper, total least squares estimation of signal parameters via rotational invariance technique （TLS） is proposed based on singular value decomposition （SVD） -ESPRIT） and the extended Prony algorithm, a new method of on-line monitoring of transformer winding deformation is proposed. Which SVD can be ideal to filter out the noise in the electrical signal to determine the number of harmonics in the electrical signal, TLS-ESPRIT can reduce the noise interference, accurately extract the harmonic frequency, and then through the harmonic analysis of the short circuit reactance method to calculate the transformer Short circuit reactance, and finally real time on-line monitoring of winding deformation. Finally, the simulation results verify the effectiveness and practicability of the method.

关 键 词：变压器绕组变形 SVD-ESPRIT 扩展Prony 谐波分析 短路电抗 

分 类 号：TN713[电子电信—电路与系统]