TG Set load fluctuations due to grid
TG Set load fluctuations due to grid
(OP)
We have a 18 MW generator running in parallel with the utility grid.The max generation is around 14 MW.After 4MW of internal consumption remaining 10 MW is exported to Grid.
Today it was noticed that thre was a severe hunding in the TG load ie.. from 10 MW it went down to 2 MW and again picked up to 8MW and again 4 MW.(As seen in DCS trends)
There was a variation in the grid frequency also in the range of 50 to 51.5 Hz during that period.After some time the grid breaker tripped on overcurrent and also an reverse active power protection alarm was noticed in the Generator relay panel.However after the tripping of the grid breaker the generator came on home load but during the time the grid breaker tripped many (not all)
motors has tripped in the plant.
Can anybody explain the phenomenan






RE: TG Set load fluctuations due to grid
RE: TG Set load fluctuations due to grid
Bill
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"Why not the best?"
Jimmy Carter
RE: TG Set load fluctuations due to grid
There are perhaps one or two other specialised modes required by the TSO as part of the connection agreement, but these are essentially modifications of the main four.
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If we learn from our mistakes I'm getting a great education!
RE: TG Set load fluctuations due to grid
The plant load is 5 MW only around 300 AMPS(11kv).So how the grid incommer breaker tripped at OVERCURRENT (recorded 2400 amps nearly balanced).Please note that the instance when the grid 11 kv breaker tripped recording a current of 2400 amps, the same time reverse power alarm was actuated in the generator protection relay..If the plant load is 300 amps how come the current has gone upto 2400 AMPS .Was the excess amps due to the reverse power in the generator.Is it possible to draw so high current during reverse power.No fault was found in the plant side and most of the motors were running after islanding.Some motors have tripped probably due to voltage drop due to such high current.
Request your opinion
RE: TG Set load fluctuations due to grid
Bill
--------------------
"Why not the best?"
Jimmy Carter