1)how to reduce the value of tan delta of trasformer and CB,bushing,CT&PT,C

1)how to reduce the value of tan delta of trasformer and
CB,bushing,CT&PT,CVT ?
2)how to reduce the resistance of CB contact and its
operating time?
3)plz.....send me the project report on conditioning and
monitoring of substation equipment on my email id
(gusaiyogendra03@gmail.com)

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