Thanks for the replies,
Please forgive my descriptions below if they sound a little unprofessional
So this issue we have is on a generator system, I belive the type of generator is an asynchronous generator, the power electronics on the rotor side of the generator from what i can gather convert ac to dc then chop up the dc to create a variable frequency ac on the the rotor ( so basically just like an inverter drive ) which allows the generator to generate at various rotor speeds by compensating adjusting the frequency of the rotor.
The when on load the system switches in two small banks of capacitors which have inductors wired in series i can only guess this is to compensate for harmmonics generated by the Power electronics. The issue we have is that the fuses supplying the capacitors keep blowing intermittantly it is always the center fuse on both banks . the capacitor banks are connected in parallel to the "drive" supply and connected via contactors.
after trying all the simple things, capacitors, contactors etc , i started to think it may be harmonics as there is nothing really on the capacitor circuit other than the capacitors that could draw the current to blow the fuses?
we changed the harmonic filter but still blew fuses again a few weeks later. I was thinking maybe next changing the power transistors on the grid side of the in verter that connected to the center fuses that keep blowing? any thoughts