Application of BSS Algorithm Based on FastICA in On-line Monitoring System of Relative Dielectric Loss
Yun Zhang · Gaoya dianqi · 2010
A type of on-line monitoring system of relative dielectric loss in capacitive high-voltage apparatus is designed,with which the safety,reliability and information-based standard of monitoring high-voltage apparatus in power systems can be improved greatly.For solving the problem that field noise causes phase error to relative dielectric loss angle measurement,independent component analysis(ICA)is introduced to the pre-processing of current signals.The mathematical model of ICA algorithm is established.The principle of FastICA algorithm based on Negentropy-maximization for ICA and its calculation procedure are given.The measured signal simulating top shield current by experiment is superimposed by Gaussian white noise,and a simulation experiment verifies the effectiveness of the algorithm.The result indicates that the BSS algorithm can suppress noise effectively and improve the accuracy of relative dielectric loss angle measurement drastically.