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Suppose I have three motors connected to a single busbar which is fed by a single transformer and suppose that the current into the busbar (i.e. the total current of the transformer secondary) is known. If I wish to calculate the transformer voltage drop the I will obviously need the load power factor. If the power factors of each of the motors is known, can the powerfactor at the transformer secondary (i.e. the overall load powerfactor) be obtained by taking the average of the three motors.

E.g. if Motor A is assumed to have PF of 0.88, Motor B PF = 0.86 & Motor C PF = 0.84, is PF at busbar 0.86?

Many Thanks in advance