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Transformer Riddle No. 10 - Power saving through reduced voltage

Well when v change tapping of TR No 1 also to 10725V (like Tr No2 ....)          how to calculate power saving from reduced voltage.... lets say Tr  No 1 load 900KW.
Author : Adarsha - From: INDIA
Wed, March 4, 2009 - 14:32
Theortically P=√3 × V × I × cos(φ)
Voltage is directly proportion to power , but for a fully loaded equipments(100 %) , when we reduce the voltage from rated, then to meet the load demand , the current will rise this will make the equipments over loaded and also resulting of increasing of temperature, Mostly all equipments are operating in 90-95 % loading , so a small reduction of voltage will give a considerable saving of electrical energy 
Author : A.Selvakumar - From: India
Wed, March 4, 2009 - 18:05
Dear Adarsh,

Whether are transformers  parallel? 
Author : Hamid - From: IRAN
Fri, July 24th, 2009 - 16:38
If you have a AC  and the voltage is less , it  wil draw more current . So , I do not see how a red. in voltrage will save power ! 
Author : R K Mohapatra - From: India
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