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It is a significant problem to evaluate the running protective relay devices. This paper proposes a novel risk evaluation method for HV line protection. Firstly, six states of the system are established. Considering the self-check of the protective relay, four risk indexes are derived. Then, according to the state division of the system, ten state Markov model is established and then the risk and...
Protection device is repairable system, and its routine maintenance is Minimum Maintenance. With the number of maintenance increasing, both the reliability of relay and the economy of maintenance are decreasing. Therefore, it should be replaced at a proper time. The optimal replacement strategy was studied based on relay reliability and maintenance economy according to field data. It first constructed...
Compared with the mean failure rate (MFR), time-varying failure rate (TFR) has advantages in accuracy and is more suitable for reliability assessment. This paper proposes the estimation approach for the TFR of the relay protection device with the field data. According to the feature of protection devices failure, it first divides the data into random failure and aging failure. And then, for the random...
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