International Journal of Advanced Technology in Engineering and Science www.ijates.com Volume No.02, Issue No. 08, August 2014 ISSN (online): 2348 – 7550 352 | Page RELIABILITY ANALYSIS AND MAINTENANCE PLANING OF MODERN 132 KV GRID SUB-STATION Irshad Alam 1 , Surya Deo Choudhary 2 , Dr. Md. Fakhruddin Ansari 3 , Rajeev Kumar 4 1, 3 Department of Electrical Engineering, BIT Sindri, Dhanbad, (India) 2 Department of Electronics & Communication Engineering, DAVIET Daltonganj, (India) 4 Department of Electronics & Communication Engineering, RIT Koderma, (India) ABSTRACT With the confirmed rapid development of electricity supply, grid sub-station play very important role in power transmission, interconnecting link between power station and consumer. It can be standardized of their voltage and KVA rating arrangement of switching factor. This paper includes the general introduction of grid sub- station, short description of different equipments in a grid sub-station, the fundamentals of failure prediction techniques derived from reliability engineering. It provides ground for treatment of field failure data for studying the various performances of the GSS equipment. Some well known failure distributions along with mathematical expression also include facilitating the study of equipment failure behavior. The failure curve may deviate from that of the mathematical model developed from a particular failure distribution curve due to varying nature of physical causes involved with the failure data, still efforts are made in the dissertation to predict the failure of GSS equipment. Feeder comprises of many clearly identifiable and independent sub- systems. Data on failure patterns of the feeders employed in 132 kV grid sub-station in Rajasthan has been collected for the three years and classified components wise. Simple graphical technique has been used for trend analysis. Exponential distribution has been used for the calculation of reliability analysis, as it is mostly suitable for electronics & electrical components. After calculating different reliability parameters in respect of varying working hours for each component of all three feeders, the feeder system reliability has been determined by using the rule of probability .Graph for failure distribution and reliability for the three feeders have been drawn showing the pinpoint critical subsystems/ faults. This part has been mentioned in this paper. In many cases break down hours are due to power failure and not from any fault in the sub-system of the feeders or in the feeders. A maintainability schedule for feeders as well as their sub-systems in the organization concerned has been maintained. In view of reliability of three feeders maintenance aspect can be improved. Includes conclusion and also shows the limitations of research. In this chapter suggestion has been given for future scope of research. Keywords: KVA, GSS, Feeder, Grid, Sub-Station, Reliability, Break Down.