abaqus裂纹扩展3d效果.ppt

电磁式电压互感器频域测量误差分析
李玉超1,刘开培1,乐健1,陈宜皇1,姜春阳2
(, 武汉 430072;,武汉 430074)
摘要:文中介绍了电磁式电压互感器(TV)的谐波等效模型,并对该模型进行了简化分析,在简化电路的基础上分析了TV比差及角差产生的原因。利用仿真软件对TV建立相应的模型,计算在基波及2-50次谐波下的比差及角差,并改变模型的参数计算参数变化时对TV测量误差产生的影响。设计了物理试验平台,并通过试验验证了理论分析及仿真的正确性。仿真及试验结果表明,电压频率较低时TV可以进行准确的测量,当频率较高时,TV的测量误差变大,比差及角差均不满足测量准确性的要求。
关键词:电磁式电压互感器;简化谐波等效电路;比例误差;角度误差
中图分类号:TM451 文献标识码:B 文章编号:1001-1390(2015)00-0000-00
Analysis on measurement error of ic voltage transformer in frequency domain
Li Yuchao1, Liu Kaipei1, Le Jian1, Chen Yihuang1, Jiang Chunyang 2
( of Electrical Engineering, Wuhan University, Wuhan 430072, China;.
2. China Electric Power Research Institute, Wuhan 430074, China)
Abstract: The harmonic equivalent model of ic voltage transformer (TV) is introduced in this paper, andas well as the simplified analysis for this model. Meanwhile, is introduced in this paper, and the causes of ratio error and angle error of TV are analyzed on the basis of the simplified circuit. The simulation model is established based on its equivalent circuit to calculate its ratio error and angle error under 2-50 harmonics different frequency through the simulation calculation, and change its parameter to explore the influence on measurement error when parameter changes. The physical test platform is designed, and the correctness of theoretical analysis and simulation experiment are verified by physical test. Results of simulation and physical test show that the harmonic measurement error will increase when measuring the harmonic with higher frequency, and the ratio error and angle error cannot meet the accuracy requirements.
Keywords: ic voltage transformer, the simplified harmonic equivalent circuit, ratio error, angle error
0 引言
电力系统中所应用的电磁式电压互感器是将电网高电压信息传递到低电压二次侧的测量仪表、继电保护等装置的一种特殊的变压器[1],是连接一次系统和二次系统的重要设备,广泛应用于6-35kV电网的变电站母线上[2],TV测量的准确性对于电力系统意义重大。
随着冲击性及非线性负荷投入使用,导致了电网中大量谐波的出现[3],这也对电能计量装置提出了更高的要求。电磁式电压互感器(TV)以及电容式电压互感器(CVT)是常用的测量一次系统电压参数的设备,这两种设备能否对谐波电压进行准确的测量,会影响到电力系统的