@thesis{thesis, author={Nasution Rezki Muharram and Prabowo Eri}, title ={Pengaruh Overhaul Terhadap Efisiensi Turbin Uap Unit 1 PLTU Banjarsari}, year={2020}, url={http://156.67.221.169/3192/}, abstract={Steam thermal power plant convert coal chemical energy into electricity on generator. One of the most important device on steam thermal power plant is a steam turbine. Steam turbine is a device to convert potential energy that the steam has into mechanical work on the form of rotation in the shaft. Steam turbine works under a high pressure and temperature constanly, overtime the steam turbine efficiency could decrease so an overhaul must be done to increase the steam turbine efficiency. This research goal is to know the effect of overhaul on steam turbine efficiency with calculation and comparison from performance test data on december 2019 and april 2020. From the calculation, the steam turbine efficiency after overhaul increase as much as 9,74% from 70,08% to 79,82%. This research prove that overhaul has the effect of increasing the steam turbine efficiency.} }