Reliability Analysis Models for Differential Protection Considering Communication Delays and Errors

Yingjun Wu, Manli Li, Yi Tang, Rong Fu and Ming Ni
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Yingjun Wu: School of Automation, Nanjing University of Posts and Telecommunications, No. 9, Wenyuan Road, Nanjing 210023, China
Manli Li: School of Automation, Nanjing University of Posts and Telecommunications, No. 9, Wenyuan Road, Nanjing 210023, China
Yi Tang: School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Rong Fu: School of Automation, Nanjing University of Posts and Telecommunications, No. 9, Wenyuan Road, Nanjing 210023, China
Ming Ni: NARI Technology Inc., No. 19, Chengxin Road, Nanjing 211106, China

Energies, 2015, vol. 8, issue 4, 1-19

Abstract: This paper proposes three probability models to assess the impact of communication delays and bit errors on differential protection. First, the mechanism of relay protection malfunction caused by communication delays and bit errors is introduced. In general, a channel’s consistent delay or bit error results in refuse-operations, while a channel’s inconsistent delay normally causes false trips. Based on the analysis of the probability distributions of communication delays and bit errors, probabilistic models of false trips and refuse-operations are proposed. Simulation results, using typical parameters, are implemented to investigate the effects of communications on the malfunction probability of differential protection.

Keywords: communication delay; bit error; current differential protection; false trip; refuse-operation; probability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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