Title :
Instantaneous availability for the protection devices based on non-homogeneous Markov model and a case study
Author :
Xue Ancheng ; Jing Qi ; Luo Lin ; Wang Junhao ; Wang Bao ; Huang Shaofeng ; Bi Tianshu
Author_Institution :
State Key Lab. for Alternate Electr. Power Syst. with Renewable Energy Sources, North China Electr. Power Univ., Beijing, China
Abstract :
While evaluating the reliability of protection devices, the instantaneous availability (IA) is more applicable than the steady-state availability. This paper first proposes a general formulation to calculate the IA of relay protection device with the non-homogeneous Markov model. Then, it presents a 4-state Markov model, including the self-test and preventive maintenance, together with time-varying failure rate (TFR) as a case study. Furthermore, based on the field data, it analyzes the variation of IA with respect to different self-test efficiency and repair cycle.
Keywords :
Markov processes; relay protection; reliability; 4-state Markov model; instantaneous availability; nonhomogeneous Markov model; preventive maintenance; protection devices reliability; relay protection device; self-test efficiency; steady-state availability; time-varying failure rate; Availability; Built-in self-test; Maintenance engineering; Markov processes; Power system reliability; Protective relaying; Instantaneous Availability; Non-homogenous Markov Model; Protection Devices; Reliability Assessment; Time-varying Failure Rate (TFR);
Conference_Titel :
Control Conference (CCC), 2014 33rd Chinese
Conference_Location :
Nanjing
DOI :
10.1109/ChiCC.2014.6896068
