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Electrifier, I feel adjusting the droop/voltage levels of the AVR will only affect the VARs sharing of the machines, but circulating current will still remain. I think that the neutral current here is mainly due to the slight unbalance in the voltages due to the winding of the machines.The...

Sorry lyledunn, I am putting up another question to you and I will answer your question after you answer my question. My question is "What is the safety procedure for system of more than 400v?".

Is the transformer is oil filled type. Normally the oil filled CTs has nitrogen blanketing on the top which is filled with and maintained at a slightly higher pressure than atmosphere. This is for preventing the oil-air contact. If there is loss of this nitrogen, then it will lead to...

Is the 480V side of the transformer delta connected? If so then there is some ground path on your third leg. This will not create the problem unless another ground develops in the third phase at any point of your system. You have to take the transformer off line and check their insulation with...

I am not very clear about this blocking arrangement of instantaneous relays. I understand that for any fault whether it occurs on any of the transformer feeders or in the 15kV bus, the fault level will remain same. By using instantaneous elements how we are going to achieve co-ordination among...

We have PMGs of our alternators, that generate the energy required for the excitation of the main field, rated at 400hz. Here it is probably used for smooth DC field current.