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Volume 31 Issue 6
Dec.  2018
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Journal of Southwest Jiaotong University  > 2018  >  53(6): 1102-1109.
LIN Sheng, LIN Xiaohong, FENG Ding. Reliability Evaluation of Relay Protection for Traction Substation of Urban Rail Transit[J]. Journal of Southwest Jiaotong University, 2018, 53(6): 1102-1109. doi: 10.3969/j.issn.0258-2724.2018.06.002
Citation: LIN Sheng, LIN Xiaohong, FENG Ding. Reliability Evaluation of Relay Protection for Traction Substation of Urban Rail Transit[J]. Journal of Southwest Jiaotong University, 2018, 53(6): 1102-1109. doi: 10.3969/j.issn.0258-2724.2018.06.002
shu

Reliability Evaluation of Relay Protection for Traction Substation of Urban Rail Transit

doi: 10.3969/j.issn.0258-2724.2018.06.002
  • Received Date: 25 Oct 2016
  • Publish Date: 01 Dec 2018
    Abstract
  • To understand the reliability and find the weaknesses in the relay protection system of urban rail transit traction substation to provide guidance for failure investigation, a reliability evaluation project of relay protection for urban rail transit traction substation was undertaken. First, the reliability index was determined according to the characteristics of the relay protection system of urban rail transit traction substation. Then, a fault tree model of the relay protection device and different configuration scheme protection systems were set up based on the system structure and failure mode. Finally, based on Markov theory and Monte Carlo method, the reliability index of relay protection of urban rail transit traction substation was calculated considering the self-test function of the microprocessor protection. The results show that the method can obtain sufficient reliability indicators to evaluate the reliability of traction substation relay protection to identify the protection system weaknesses. On the condition that the self-test success rate is 0.9, the relay protection device failure probability caused by the protection maloperation is 17.93% higher than that caused by the protection rejection. Meanwhile, the self-test success rates of maloperation and rejection are 86.09% and 74.37% respectively, and the availability of protection devices is 99.88%. Backup protection can reduce the rejection probability of the protection system, but backup protection caused about 30%–50% of the maloperation of the protection system. Therefore, it is necessary to consider the impact of protection maloperation when selecting the protection configuration.

     

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