Skogsgurra
Electrical
- Mar 31, 2003
- 11,815
I was dragged into a discussion about a 10 MVA 6 kV generator that had an insulation failure after five years of operation. It turned out that the company that had delivered the electrical gear (one of the Top Ten - one could say Top Three - suppliers in Europe) had chosen vacuum breakers for the turn-key delivery and also chosen not to include any overvoltage protection. So, after around 750 operations, there was enough damage to the stator winding to create a flash-over during operation.
Problems with vacuum breakers are well known (I had my first experience with that in 1974) and that makes me wonder: If you choose to use vacuum breakers for a 6 kV 10 MVA generator, wouldn't you also choose to install surge arresters? I, personally, regard that as best practice. What is your opinion?
Gunnar Englund
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
Problems with vacuum breakers are well known (I had my first experience with that in 1974) and that makes me wonder: If you choose to use vacuum breakers for a 6 kV 10 MVA generator, wouldn't you also choose to install surge arresters? I, personally, regard that as best practice. What is your opinion?
Gunnar Englund
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...