Phase Difference Measurement for Current Sensor Based on FastICA
Guoliang Gong, Huaxiang Lu, Peihua Liu, Tianxiang Chen · SEMI-IR · 2012
Phase difference of a current sensor is susceptible to environmental impact.In order to improve reliability and accuracy of the on-line insulation monitoring system,a phase difference measurement method for current sensor on-line monitoring is proposed.In the method,independent component analysis(ICA) is used to extract the test signal from the output of current sensor.An ICA model is established,and a method given to compensate the number of observed signals and its components.To solve the problem that phase errors are different in different test runs,an evaluation index of the mixing matrix is proposed to find the most accurate result.Experimental results indicate that for a signal with SNR=10.9 dB,the percentage of phase errors below 0.06 is raised form 51.4% to 81% by using the evaluation index.