CT VA Burden

CT must not be saturated

The main function of CT is to transform faithfully the current and also be capable of developing sufficient voltage across the secondary to drive the current through the connected burden

Vact=[20000/1000] * 5 =100V

Vspecified = [(ALF x VA)/C.T.sec]
            = [ (15 x 5) / 1 ] = 75V

Vspecified < Vact

Hence CT may saturated

Vact=[20000/1000] * 5 =100V   ———  Vact=[20000/1000] * 5 =100V
Vspecified = [(ALF x VA)/C.T.sec]                  Vspecified = [(ALF x VA)/C.T.sec]     
              = [ (15 x 10) / 1 ] = 150                                = [ (15 x 7.5) / 1 ] = 150V
Vspecified > Vact                  Vspecified > Vact
CBCT-Installation and correct connection
Application of CBCT and correct position of armour earthing