Interested to know if anyone has experienced problems with modern electronic protection relays designed for power transformers. I have recently experienced failure to operate with a close in secondary earth fault on a recently commissioned 66/22kV power transformer. The device appears to have...
Is there any resouce available to assist with better understanding of this phenomonon or ways of overcomming the problem. The problem exists with single phase switching, fusing of three phase transformers connected to relatively long lengths of underground cable. I understand the resonance is a...
Does any one know of any economic method of linking and teeing off 22kV cable above ground similar to 11kV systems such as HOLEC, Elastimold. I am looking at the prospect of installing cable instead of O/H line in some rural built up areas but research to date indicates that costs are still to...
