Failure Analysis of Protective Devices in Power Distribution Systems for Reliability Purpose

Abstract

This paper presents the reliability study of failure rate, mean time to failure (

A review of methods for condition monitoring, surveys and statistical analyses of disconnectors and circuit breakers

“…The number of failures is too small for a precise determination of the parameters of the distribution. Tippachon et al studied failures of protective devices such as circuit breakers, disconnectors and fuses and found that the failures follow a Weibull distribution with a shape parameter between 0.5 and 1 [33]. Choonhapran and Balzer developed a Markov model of circuit breakers with five different failure modes, which follow mainly an exponential distribution [34].…”

Fault tolerant control of a three-phase three-wire shunt active filter system based on reliability analysis

“…The variable (see Table 3) represents the switched failure probability of the triacs T rk . The parameters of Table 2 are chosen according to the values defined in the papers [18][19][20]. These papers describe more particularly specific reliability analysis of IGBT, thyristor, fuses and capacitors.…”

PEA’s premium power service: Baseline and risk assessment

“…If we know scale and shape parameter, then we could plug them into (1) and calculate F (the probability of failure) at any time, t. According to [9], the Weibull parameters a and b can be estimated from PQ data.…”

“…3 shows the survival probability plot of PEA distribution system over a 12-month period in 2005 for A and B substation both TP1&2 (22kV) for SEMI-F47 curve. The Weibull parameters a and b using [9] and PQ data in Fig. 3 are shown in Table V.…”