69 KV GSU for 66 kv system
69 KV GSU for 66 kv system
(OP)
What is the advantage of a GSU transformer of 11KV/69 KV Connected to a 66KV grid.Why 69 KV is used instead of 11kv/66 KV
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69 KV GSU for 66 kv system
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69 KV GSU for 66 kv system69 KV GSU for 66 kv system(OP)
What is the advantage of a GSU transformer of 11KV/69 KV Connected to a 66KV grid.Why 69 KV is used instead of 11kv/66 KV
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RE: 69 KV GSU for 66 kv system
RE: 69 KV GSU for 66 kv system
RE: 69 KV GSU for 66 kv system
What is the RATED voltage of your generator unit? Is it 11 kV or otherwise?
RE: 69 KV GSU for 66 kv system
RE: 69 KV GSU for 66 kv system
MVAR's (reactive power) always flow from high voltage to low voltage. If voltages are equal no reactive power flows.
63-69 kV is only a 4.3% increase, within the +/-5% typical generator voltage range and GSU tap range.
RE: 69 KV GSU for 66 kv system
the use of an higher nominal voltage on HV side of GSU causes a shift of the whole capability curve of the generator along the Q axis.
In other words it will be more easy to supply reactive power to the grid and more difficult to absorb reactive power from the grid.
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RE: 69 KV GSU for 66 kv system
In that case one of the objectives of your generator connecting to Utility is to provide voltage support in addition to active power export to the grid.That means
the GSU trafo should have a higher no-load voltage to push reactive power to achieve voltage support as pointed out by member rcwilson.
RE: 69 KV GSU for 66 kv system
RE: 69 KV GSU for 66 kv system
RE: 69 KV GSU for 66 kv system
There may also be some considerations about over excitation (volts per Hz) if the transformer's rated voltage is less than operating voltage. That problem may be coverd in the OLTC tap design specifications.