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Power system,which has large-scale and complex structure,plays a significant role in national economy development.However, the system components will occur various malfunction or be an abnormal operation state due to various man-made and natural factors.This paper aims to ensure the power grid's safe operation by improving the reliability of relay protection which acts as a key component of the power system. We firstly construct the relay protection reliability evaluation index.Then we obtain the optimal maintenance cycle of protection devices based on Markov model to enhance furthermore to guarantee security safe and stable operation of power systems.

A Maintenance Strategy of Improving the Reliability of Relay Protection Based on Markov Model