基于虚拟仪器的电力暂态信号小波分析仪

Wavelet transform analysis instrument of electric power transient signal based on virtual instrument

电力设备出现绝缘老化、绝缘电阻降低、局部放电等异常现象会破坏电力系统原正常状态,出现暂态现象,产生暂态信号。因此,电力系统迫切需要用于暂态信号分析的装置,基于虚拟仪器设计了一套电力暂态小波分析仪。分析仪硬件由信号调理板、NIPCI-6143数据采集卡及计算机组成。软件主要完成对所采集的暂态信号的显示、小波变换、后处理及应用分析等功能。利用EMTDC(ElectromagneticTransientsincludingDC)仿真数据对系统软件的功能进行了演示,结果表明,设计的分析仪是可行的。

Abnormities of electric power devices,such as insulation aging,insulation resistance decreasing and local discharging,may destroy normal conditions of power system and cause transient phenomena and corresponding signals. The instrument used for electric power transient signal analysis is essential. A set of electric power transient wavelet analyzer based on virtual instrument is designed. Its hardware consists of the signal conditioning card,NI PCI-6143 data acquisition card and computer. The software mainly realizes waveform display,wavelet transform,post processing and application analysis of acquired transient signals. System functions are demonstrated with EMTDC （ElectroMagnetic Transients including DC） simulated data and the result shows its feasibility.