one NGR only
one NGR only
(OP)
We have 03 offshore 6 kV generators work parallel, if only there is 1 generators NGR connect to the ground be to obtain neither
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: one NGR only
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If we learn from our mistakes I'm getting a great education!
RE: one NGR only
I have seen the same situation in one of the Power Plant for a fertilizers industry in Pakistan. This was designed by BBC.
RE: one NGR only
Sorry for my English, do you know why they design like that. Doing so can benefit
RE: one NGR only
RE: one NGR only
RE: one NGR only
Bill
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"Why not the best?"
Jimmy Carter
RE: one NGR only
Using only one grounding resistor keeps the maximum ground fault current down and eliminates circulating third harmonic currents between the units. The typical 10 second grounding resistor normally have no (official)continuous current rating, so harmonic currents can pose a heating problem in the resistor, although this is generally not a major concern if the generators are well matched.
Switching the grounding resistors adds additional cost and complexity, so there are tradeoffs. It is not too common in the US, in my experience, but apparently it is routinely done in other parts of the world.
David Castor
www.cvoes.com
RE: one NGR only