PT Fuse Failure 1

[sngpl]

We have a 3.6 MW Hydro Electric Power Generator. The unit was shut down for a couple of days and when we attempted to start it, it won't develop voltage. We found that one of the generator PT High Tension side fuses was sort of blown. I said sort of because it’s damaged in the center. I think if a fuse blows... it blows .... But this one is only damaged in the center and not blown completely.

My gut feeling is that the fuse was defective and got damaged. We should megger the generator with PT etc connected and then to further sectionalize if the results aren't good. If the results are good then simply replace the fuse and run the unit.

Honorable Forum: Please correct me if I am wrong!!

What could be the problem and its causes?
What tests to perform?

Thanks.

 

[sngpl]

The megger results for the generator are really good and almost the same as the last test in performed in May 2003. We haven't yet operated the unit but hope that it should be fine.

Thanks for all your suggestions, replies, information and suggestions.