Electrical Engineering ⇒ Topic : Exact Voltage Drop

     EXACT VOLTAGE DROP

                                               Figure (a) Phasor diagram of a transformer referred to secondary.

From Figure (a), the exact voltage drop is AH instead of AG. During calculation of approximate voltage drop, AG has already been calculated. If GH is added to AG, the exact voltage drop will be obtained.

From the right angle triangle OCG, we get

          .................. (1)

  ................. (2)

                    ............. (3)

It may be noted that the upper sign is to be used for lagging power factor and the lower sign for leading power factor