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I have seen the term ferro resonance used in a few answers on this site recently and I had not heard of it before. The term doesn't have a Wikipedia page, and my web searching doesn't seem to come up with any scientific explanation of the phenomenon (though I did find a few definitions of what it is). Thanks.
And got the following answer:
Ferro-resonance can generate overvoltages of upto 12 times line to ground source voltage upon opening a single phase device or poorly synchronised 3 phase device. Voilent failure can occur exposing personnel to the high voltage failure and accompanying conditions. Ferro-resonance conditions can result in damage to lightning arresters, switching devices, buried cable, transformers and associated equipment. Ferro-resonance can be initiated when all of the following elements are present and the switching means at the dip point or takes off when a single phase device or an unsynchronised 3 phase device that does not operate all phases within 1/2 cycle. 1.System grounded at the source, but with no ground at the transformer bank 2. Shielded cable length or overhead conductor length sufficient to create the capacitance necessary 3. Transformer size that permits saturation of the iron core at the operating voltage 4. Transformer unloaded or lightly loaded. Prevention or control of ferro-resonance can be by: 1. Using wye-wye transformer withboth neutrals grounded and tied to systems neutral 2. Using only phase-to-neutral (not phase-to-phase) transformers connections for single pahse transformers. 3. Limiting length of underground cable 4. For poorly synchronised switching devices, extra resistive load of 2% of the transformer capacity on underground cable. Ref:www.tpub.com/doeelecsafety/electrical safety VR