I set no load voltage of a generator ( in a dredger working in INDIA ) to 415 V at 50 Hz. It work in parallel with other generators for two days. After that when i check no load voltage was 410 V at 50 Hz. How does it changed ?
Once I change the AVR then also happening same. If I want to use generator every time i adjusting noload voltage. There is a filer/suppressor on input line of AVR and it is not earthed. May this can cause the problem ? . The area this generator is working have much noice and vibration.