ZnO Elements in Regulating Windings of Transformers

[xabproject]

Dear All,
Any information on the use of ZnO Elements in the Regulating Windings of Transformer will be a great help.
Thanks!

 

[RalphChristie]

Can you expand on the term ZnO Elements?
ZnO arrester? Zig-Zag transformer?

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[amps21]

Zno is Zinc oxide assemblies. They are used in some transformers, usually Delta connected regulating winding when the regulation is at the line end instead of the middle of delta.

 

[amps21]

Obviously this is to protect from the over voltage condition in the tapwinding generated due to system transients. Delta line end tapwinding is where i used them but they may be used as deemed necessary.