Transformer Help!!!


I'm currently studying the fundemetals of Transformer application and if at all possible could do with some help on any of the following;

i). Comparison of:

mineral oil filled transformers Askerel filled transformers & dry type transformers.

ii). Why star-star power transformers are often supplied with a third delta connected tertiary winding.

iii). What precautions are necessary before connecting power transformers in parellel.

iv). Explaination of the following types of transformer protection:

Differential protection Restricted earth fault overcurrent gas and oil relay

v). Explaination of the Buchholz relay's construction, operating principle & purpose.

Any kind of website or information supplied will be of great help, please mail to:

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