Reliability Analysis Models for Differential Protection Considering Communication Delays and Errors

Energies

Yingjun Wu¹  Manli Li¹  Yi Tang²  Rong Fu¹  Ming Ni³ 

[1] School of Automation, Nanjing University of Posts and Telecommunications, No. 9, Wenyuan Road, Nanjing 210023, China; E-Mails:;School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China; E-Mail:;NARI Technology Inc., No. 19, Chengxin Road, Nanjing 211106, China; E-Mail:

关键词: communication delay;    bit error;    current differential protection;    false trip;    refuse-operation;    probability;   

DOI  :  10.3390/en8042454

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.