Renovation with confirmation test for vertical Francis turbine

This paper presents confirmation test and renovation of 4x9 MW vertical Francis turbine of UMIAM hydro Power station situated at Shillong, Meghalaya State of India. For this purpose before renovation of plant, test conducted for measurement of various signatures like pressure, temperature, speed, vibration etc. which increase due to old age. The results show that after confirmation test and renovation the generator output is always improved for the parameters like guide vane servomotor stroke, vibration, shaft run out and noise at turbine pit entrance. The result also provides information that the overall efficiency of the plant is increased after renovation.