Reliability and Maintainability Improvement of Substations With Aging Infrastructure

Abstract

The increasing size, aging equipment, and complexity of power systems, coupled with present day financial constraints, have made the use of probabilistic methods and reliability indices a necessity for maintaining continuity and quality of service to customers. Proper maintenance-related decisions should address all of these issues to improve system reliability while meeting limited budget constraints. This paper proposes algorithms that enable system-level reliability assessment with detailed modeling of maintenance for aging equipment. Stochastic-based reliability modeling of substations with aging equipment is presented, which enables the study of equipment aging, failures, and maintenance and their effect on substation-level availability and frequency of failure. Several case studies are provided which describe optimization of maintenance activities and the impact on maximum substation reliability. The algorithms provide a valuable tool for processing detailed models of aging equipment and maintenance of individual pieces in system reliability assessment applications. These algorithms are consistent with existing reliability models and are capable of being integrated into utility asset-management programs.

The reliability investigation considering data uncertainty; an application of Fuzzy Transformation Method in substation protection

“…Furthermore, the rates are supposed to be constant quantities especially be time-invariant, but it is widely believed that aging processes and environmental factors influence utterly on components, systems and the expected performances during the time of operation. Corrective maintenances and rehabilitation actions have the noteworthy impacts on working states of a system [10,35,36].…”

Key Performance Index for Overall Substation Performance

“…In this paper focus is made on the evaluation of substation maintenance performance based on such a powerful concept. In the literature application of TQM concept for power distribution has been reported [12]. But, in this OEE is calculated based on the Loss Structure.…”

Substation Maintenance Optimization By Considering Ageing Equipment

“…Markov model is employed to study the equipment deterioration due to aging and maintenance (major & minor) and minimum cut-set method is used to extend the above studies to substation levels as shown in Fig 5. Hence, Markov models for equipment and minimum cut-set based reliability estimations have been combined for the substation level reliability or availability studies [9]. Substation availability is a very crucial index which is used for the substation maintenance optimization.…”