| Title | Reliability Analysis and Improvement Programs of Kamojang Geothermal Power Plant Unit-1 |
|---|---|
| Authors | Danu S. PURNOMO, Reza ADIPRANA, Eko YUNIARTO, Prihadi S. DARMANTO |
| Year | 2015 |
| Conference | World Geothermal Congress |
| Keywords | reliability, weibull distribution, generator, transformer |
| Abstract | Kamojang Geothermal Power Plant (GPP) Unit 1 has installed capacity of 30 MWe. As its function as a base load system, Kamojang GPP ought to supply electricity continuously. This operation period excludes the requirement of repair or scheduled maintenance (periodic or corrective). Market demand encourages Indonesia Power (IP) management to improve of plant reliability and availability in producing a stable supply of electricity. Even though the plant has been operated for more than 30 years, Kamojang GPP Unit 1 still does not have reliability model and failure prediction. The operation strategy can be specified from the pattern of reliability and failure prediction. Reliability improvement programs are expected to maintain reliability and minimize the risk of force outage. A statistic model based on Weibull Distribution-2 Parameters Method is proposed in order to determine reliability model and failure prediction on generator and transformer. Based on the model, the reliability of generator and transformer has been decrease from its initial condition. Generator has its reliability value of 23%, while the reliability of transformer reaches 12% within 245,748 hours of operation (equivalent to 30 years). Improvement programs for generator are stator winding rewind in 2015 and generator cooling performance upgrade in 2016. Transformer improvement are oil regeneration in 2014 and replacement of main transformer in 2015. 1. INTRODUCTION Today’s demand on electricity availability, capacity and clean power is increase significantly along with the country development planning. Geothermal energy is one of the alternative solutions to reduce the impact of global warming and society dependent on fossil fuels. Since it was commercially operated in 1982, Kamojang Geothermal Power Plant (GPP) Unit 1 has its installed capacity of 30 MWe and operated as base load system. It means that the plant should be operated continuously through the year except in term of scheduled outage (periodic or corrective). Kamojang GPP supports Java-Bali electrical grid and supplies mainly to Region II of the grid. Reliability is an important factor for base load system. It maintains low operating costs and more stable power generation. Thus, realibility will offer more attractive prices through long-term agreements. So that reliability is critical factor in Kamojang GPP due to the plant’s function as main foundation of the electrical system in Indonesia. Market demand encourages Indonesia Power (IP) management to improve of plant reliability and availability in producing a stable supply of electricity to the grid. The operation and maintenance strategy can be specified by knowing the reliability model and current condition evaluation of equipment. Reliability improvement programs are expected to maintain reliability and minimize the risk of forced outage. Within plant reliability, electrical energy sales increment can be guaranteed. This paper will discuss reliability model, current condition and reliability improvement program of Kamojang GPP’s main equipment especially generator and transformer. |