Optical Electric Current Transformer Error Measuring System Based on Virtual Instrument

Abstract

Optical electric current transformer is introduced in this paper. Based on virtual instrument and digital signal processing technology, error measuring system is designed by using LabVIEW software and DAQ-2006 data acquisition card. There are harmonic analysis module, error analysis module, and history data analyses module in error measuring system. Functions of these three modules are introduced. Measuring channel's error and protection channel's error of optical electric current transformer, are measured. Random phase error curve and ratio error curve of measuring channel in different test current are plotted. The result shows that, this error measuring system achieves accuracy standard, and is able to measure phase error and ratio error of optical electric current transformer exactly.