Comparative Analysis of the Reliability of Instrumentation and Control Systems Using the Signature Theory
- PDF / 1,388,701 Bytes
- 8 Pages / 612 x 792 pts (letter) Page_size
- 87 Downloads / 136 Views
TOMATION AND HEAT CONTROL IN POWER ENGINEERING
Comparative Analysis of the Reliability of Instrumentation and Control Systems Using the Signature Theory I. I. Galieva, *, V. A. Chepurkoa, A. N. Chernyaevb, and A. A. Shilovb aAO
bNational
Rusatom Automated Control Systems, Moscow, 109507 Russia Research University Moscow Power Engineering Institute, Moscow, 111250 Russia *e-mail: [email protected]
Received January 15, 2020; revised February 11, 2020; accepted February 19, 2020
Abstract—At the present, in the comparative analysis of design decisions from the point of view of system architecture, a qualitative and quantitative analysis of the indicators for each solution is performed followed by a comparison of the results. The classical method of calculating reliability is very laborious due to the need to take into account the properties of all elements of the system. One of the tools to quantify the reliability of systems consisting of components with random failure rates that are independent and equally distributed is signature theory. The signature describes the structure of the system and can be combined with ordinal statistics of the component failure time to form conclusions about the reliability of the system and compare several systems according to this criterion. The article provides a comparative analysis of the safety of instrumentation and control system using the classical method of calculating reliability indicators as well as using signature theory. As an example, the article considers a protection system that includes the initiating and executive parts. The system architecture is presented in several simplified versions. The dependences of the probabilities of failures of the “failure on demand” and “spurious actuations” type for each of the architecture implementation variants are obtained. It is concluded that, with the exponential distribution of MTBF, there is a complete correlation of the results of circuit comparison performed using both the classical method of calculating reliability (based on the failure rates of components) and using signature theory. Moreover, the use of signature theory greatly simplifies comparing the reliability of systems and networks consisting of components of the same type. Keywords: signatures, instrumentation and control systems, reliability, comparative reliability analysis DOI: 10.1134/S0040601520100031
Taking into account the specifics in the operation of NPP monitoring and control systems and the importance of the functions performed by the automated process control system, reliability is currently one of the main indicators defining technical solutions for the system. The main reliability indicators under consideration are the probability of the system failing upon demand and the probability of false alarms. Currently, to compare design decisions on the reliability of structures, a qualitative and quantitative analysis of the indicators for each solution is performed followed by a comparison of the results. The classical methodology for calculating reliabi
Data Loading...
