A failure rate estimation method of relay protection equipment based on the maximum likelihood estima-tion method is proposed,and the failure rate and data types of relay protection equipment are introduced.Summa-rize,and then distinguish accidental failure and aging failure in different failure types,and propose a failure rate es-timation method based on maximum likelihood estimation method for different data types.Finally,through an exam-ple analysis of the measured failure information of 220kV and above line relay protection equipment in a regional power grid from 2010 to 2011,the effectiveness of the proposed method is verified by comparing with the traditional least square estimation method based on exponential distribution.
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