THREE PHASE REAL POWER MEASUREMENTS

THREE PHASE REAL POWER MEASUREMENTS                                    

The three phase real power is given by,                                                                               

                                                                    P_3ph= 3 V_ph I_ph cos Ø                           or                    

                                                                     P_3ph= √3 V_L I_L cos Ø                                                                      (3.8)

The three phase power can be measured by using either one wattmeter, two watt meters or three watt meters in the measuring circuit. Of these, the two watt meter method is widely used for the obvious advantages of measurements involved in it as discussed below.