基于电容式电压互感器的过电压测量方法改进研究  

Research on Improvement of Overvoltage Measurement Method Based on Capacitive Voltage Transformer

作　　者：张凯悦 杜思琪 袁冬 吴亚森 张峰[1] 崔俊杰 曹雯[1] ZHANG Kaiyue;DU Siqi;YUAN Dong;WU Yasen;ZHANG Feng;CUI Junjie;CAO Wen(School of Electronic Information,Xi'an Polytechnic University,Xi'an 710048,Shaanxi Province,China;Northwest Institute for Design and Research Co.,Ltd.,Xi'an 710077,Shaanxi Province,China)

机构地区：[1]西安工程大学电子信息学院电气系,陕西西安710048 [2]中联西北工程设计研究院有限公司,陕西西安710077

出　　处：《电力与能源》2024年第4期480-485,501,共7页Power & Energy

基　　金：西安工程大学大学生创新训练计划项目(S202310709087);西安市科技局科技计划项目(23GXFW0016)。

摘　　要：电容式电压互感器(CVT)的暂态特性存在局限,直接测量过电压容易受到电磁环境的干扰,这限制了对系统中各节点电压的精确监控以及冲击过电压波形数据的准确采集。为此提出了一种改进方案,在现有CVT的基础上加装宽频带传感器。该装置能够扩大采集冲击过电压时的频率范围,提高响应速度和采样率,同时确保电力系统的稳定运行,从而显著提升测量数据的准确性,并有助于更深入地分析电能质量。为了验证CVT直接测量过电压数据的不准确性,采用了串联分压法,并构建了CVT仿真模型。通过构建改进后的CVT仿真模型进行了仿真分析,并搭建试验平台进行测试,证实了该改进方案的有效性。Capacitive Voltage Transformers(CVTs)have limitations in transient characteristics,and direct measurement of overvoltages is susceptible to electromagnetic interference,which restricts accurate monitoring of voltage at various nodes in the system and precise collection of transient overvoltage waveform data.To address this problem,an improved method is proposed by integrating a wide-band sensor into existing CVTs.This device enhances the frequency range for capturing transient overvoltages,improves response speed and sampling rate,and ensures stable system operation.As a result,it significantly enhances the accuracy of measurement data and facilitates deeper analysis of power quality.To validate the inaccuracy of directly measuring overvoltage data with CVTs,this study employs a series voltage division method and constructs a CVT simulation model.Simulation analysis using the improved CVT model is conducted,and a test platform is set up for experimental verification.The test results confirm the effectiveness of the proposed improvement approach.

关 键 词：过电压 电容式电压互感器 传感器 

分 类 号：TM451.2[电气工程—电器]