Calculation of Percentage Deviation

Percentage Deviation
D= (AR-CR)*100/CR

Here,
D=  Percentage Deviation
CR= Calculated Ratio of the Transformer
AR= Actual Ratio of the Transformer

EXAMPLE
We have Transformer with CR as 44.00.
We are getting the actual ratio of the three phases as 44.10,44.00 & 43.90.
The percentage deviation will be calculated as the table below.

CR AR D
44.00    44.10     0.227
44.00  44.00      0
44.00  43.90 -0.227


        
    

(Updated : January 24, 2018)