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I want to know the effects of a fuse in a phase (Say Y phase) of primary blown in a 3phase Dyn11 33kV/400V 250kVA distribution transformer. i am particularly interested in the effect of this on the secondary terminals (where the neutral is solidly earthed type). I understand that the primary voltages will be 33kV, 16.5kV, 16.5kV but have no technical idea about the following:
1. what will be the L-N voltages of secondary when unloaded?
2. will there be much difference in if it is loaded with balanced load?
3. will there be any big deviation if it is loaded by unbalanced load as in (2)
4. what about the neutral earth current in secondary?
5. will there be any damage to the transformer if this is left for long time?
6. much helpful if a complete phasor diagram can be provided
7.what are the effects of this on single phase loads and three phase loads connected to secondary?
I kindly expect a good answer!
1. what will be the L-N voltages of secondary when unloaded?
2. will there be much difference in if it is loaded with balanced load?
3. will there be any big deviation if it is loaded by unbalanced load as in (2)
4. what about the neutral earth current in secondary?
5. will there be any damage to the transformer if this is left for long time?
6. much helpful if a complete phasor diagram can be provided
7.what are the effects of this on single phase loads and three phase loads connected to secondary?
I kindly expect a good answer!