טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentSoloveichik Pinhas
SubjectReliability Analysis of Clearing Disturbances in Electricity
Supply Network at Substation Facilities
DepartmentDepartment of Quality Assurance and Reliability
Supervisor Dr. Lev Reznikof


Abstract

The electrical power supply network is exposed to random disturbances, which occur in the transmission lines, and thus disrupt the transmission of energy from power generators to the customers. The disturbance clearing systems are installed in all  substation lines.Two research methods were used and tested in this work: MARKOV Chains Method, Fault Tree Analysis.The attempt to build a complete reliability image of the system using MARKOV Chains method was unsuccessful due to the unability of the software in use (‘MEADEP’) to deal the “explosive nature” of MARKOV Chains solution required to represent the system. The Fault Tree Analysis is a method for analyzing the reliability of multi-component systems. Since the system has a variety of construction configurations, 32 Fault Trees were built for examining the practiced and theoretical variations of the system. The Reliability Data Base (RDB) was based on generic databases, field data, and manufacturer's data. The surrounding activities of the system were also taken into account during the analyzing phase. The obtained unavailability results corresponds to the unavailability field reports. The conclusions are reached from the results of each of the inspected system variations about: the weak points of the system, the most effective components to be improved, the preferred variation of the system, the effectiveness of  redundancy in  the system parts. Based on the over-all findings of this work, it can be concluded that analyzing the system using the Fault Tree Analysis was found to be an efficient method in analyzing the reliability of disturbance clearing system.