A Study on Quantification of Unavailability of DPPS with Fault Tolerant Techniques Considering Fault Tolerant Techniques' Characteristics

Abstract

With the improvement of digital technologies, digital I&C systems have included more various fault tolerant techniques than conventional analog I&C systems have, in order to increase fault detection and to help the system safely perform the required functions in spite of the presence of faults. So, in the reliability evaluation of digital systems, the fault tolerant techniques (FTTs) and their fault coverage must be considered. To consider the effects of FTTs in a digital system, there have been several studies on the reliability of digital model. Therefore, this research based on literature survey attempts to develop a model to evaluate the plant reliability of the digital plant protection system (DPPS) with fault tolerant techniques considering detection and process characteristics and human errors. Sensitivity analysis is performed to ascertain important variables from the fault management coverage and unavailability based on the proposed model.