Evaluation of operating stability of magneto-optical current transformer
Guo Zhi-zhong · Dianli zidonghua shebei · 2007
The operating stability is one of the important indices for evaluating the performance of optical current transformer. The mathematical light intensity models of magneto-optical current transformer are deduced based on the effects of linear birefringence and the static state operating light intensity is defined as well. The time series of static state operating light intensity is obtained by field data mining. The correlation analysis theory is introduced and the effect of ambient temperature on the operating stability of optical current transformer is analyzed by calculating the cross correlation coefficient between them. The analytical results show that,the static state operating light intensity is greatly related to the ambient temperature and the effect of ambient temperature has time-lag on the static state operating light intensity. The long-term temperature characteristic of light intensity is proposed,based on which the evaluation criterion for the operating stability of optical current transformer is proposed.