Page 859 - Basic Electrical Engineering
P. 859

or,


                                                    I  = nI  + I  cos α
                                                     1
                                                                 0
                                                           2
               or,

                                              I  = nI  I  cos[90 − (δ + α)]
                                                      2 0
                                               1
                                                  = nI  + I  sin (δ + d)
                                                       2
                                                            0
               Actual transformation ratio,



















               Ratio error of the current transformer
               = Nominal ratio – Actual ratio


               Since,








               Percentage ratio error
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