| Abstract |
Kamojang is the first Geothermal Field to produce the first commercial power plants with capacity of 30 MW since 1982, and subsequently, an additional of 2 x 55 MW completed in operation in 1987. It has been operating for 37 years. Similarly, the second geothermal field is Gunung Salak power plant drilled in 1983, and the first power plants 55 MW operation in 1994, and following expansion units was installed with total capacity 340 MW since start up. It has been 25 years in operation. In March 2012, Kamojang unit 1 capacity of 30 MW, major equipment’s failure was from generator. After unit was shut off due to high vibration, it was founded foreign object that strongly indicates from spacer material between coil end rotor. This spacer material has been deteriorating, because of heat dissipation from rotor winding, after operation in many years. It is need 70 days unit stop to give IP’s own engineer to fix the problem. November 2013, Kamojang unit 3 capacity of 55 MW, major failure on deformation of generator insulation, spacer end winding generator, causing generator short winding. It was need more than 5 months, to recover back in operation. March 2017, Gunung Salak unit 3 capacity of 60 MW, major failure on rotor generator. It was need 2 months to fix the problem. Thorough inspection indicates that the problem on rotor generator were caused equipment’s aging, non-properly cooling process due deposition, in consequences generator’s short circuit during operation. To prevent the same situation on others generator, properly regular measurements to predict the potential failure can be avoided, by replacing the insulations during annual plan maintenance |