Ztrain1985
Electrical
- Dec 18, 2007
- 34
For a job we are looking at installing a lighting suppression system, but my company has no information or previous experience with such jobs.
The system in question is an ungrounded 4160V, stepped down from a 2500 kVA Wye Primary, Delta Secondary Transformer, that feeds several buildings up to 2000 FT away.
What I have gathered so far is that we need an arrestor good for about 33kV, or about 10. p.u of the L-L voltage. It will be a Metal Oxide (MOV) type as well.
I have also read that the valid protective distances for arrestors are something to the effect of several miles, so we could in theory get away with a single set of arrestors per building feeder, however one at the transformer and 1 at the building (reflection point) would be best.
Is there anything else I need to know about this? And is my game plan at least correct in theory?
The system in question is an ungrounded 4160V, stepped down from a 2500 kVA Wye Primary, Delta Secondary Transformer, that feeds several buildings up to 2000 FT away.
What I have gathered so far is that we need an arrestor good for about 33kV, or about 10. p.u of the L-L voltage. It will be a Metal Oxide (MOV) type as well.
I have also read that the valid protective distances for arrestors are something to the effect of several miles, so we could in theory get away with a single set of arrestors per building feeder, however one at the transformer and 1 at the building (reflection point) would be best.
Is there anything else I need to know about this? And is my game plan at least correct in theory?