摘要
为了有效降低现场在线监测的干扰,提高系统的测量准确度,设计了一套电容型设备绝缘在线监测系统。该系统采用分层(级)分布多CPU结构,整个监测系统由分布于现场的各个现场测量与处理单元和位于主控室的数据管理与诊断系统所共同组成。现场测量与处理单元以数字信号处理模块(DSP)与逻辑和控制模块(FPGA)为核心,软件上采用加窗插值的高精度快速傅立叶变换(FFT)算法,可有效降低非同步采样和频率泄漏给谐波分析带来的误差,提高测量准确度。针对目前影响电容型设备在线监测系统测量准确度的各种因素,给出了该系统在改善系统测量性能的相关措施。在实验室模拟现场接线测试了系统,其测试结果与标准M-8000型变频介质测试仪相比,绝对误差均<0.1%,该在线监测系统的测量准确度能满足要求。
On-line accurate monitoring for capacitive-type equipment insulation is a difficult problem at home and abroad, in order to decrease the interference on site and to improve the measurement precision of system, an on-line monitoring system for capacitive-type equipment insulation is designed. The system adopts a tiered and distributed multi-CPU structure, which is composed of the on-site measuring and processing unit, and data management and diagnosis system in the control room of substation. The on-site measuring and processing unit is based on DSP＋FPGA hardware platform. The windows and interpolation algorithm is applied to effectivefy reduce the influence of asynchronous sampling caused by frequency fluctuation of power system and to increase the precision. On the basis of analyzing the influential factors of on-line monitoring system, some correlative methods for this system are proposed to increase the measurement precision. Based the simulating environments test conducted in the lab, the test results are compared with those by standard dielectric M-8000 loss measurement apparatus, the absolute errors are all less than 0.1 %, it is proved that measurement accuracy of this system can meet the demands of on-site monitoring.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第4期828-832,共5页
High Voltage Engineering
基金
国家高技术研究发展(863)计划(2007AA04Z411)~~
