Web18. While measuring power in a 3-phase load by two wattmeter method. The readings of two wattmeters are equal and opposite when (a) power factor is unity. (b) load is balanced. (c) phase angle is between 60 o and 90 o. (d) the load is pure inductive. http://cord01.arcusapp.globalscape.com/three+phase+power+measurement+lab+report
Choosing the Best Three-phase Power Measurement Method
WebAug 9, 2012 · The total power for the three phases is the algebraic sum of the three wattmeter measurements, as each meter is in essence measuring a single phase of the three-phase system. Pt = P1 + P2 + P3 Figure 4. This three-phase, four-wire system uses three wattmeters. WebMay 13, 2024 · The power measured by the wattmeter-1 is, W1 = VL IL cos (30 - 60) = √3/2 VL IL Similarly, power measured by the wattmeter-2 is, W2 = VL IL cos (30 + 60) = 0 Hence, at 0.5 power factor, only wattmeter 1 reads the total power i.e., only one wattmeter reads the value. At Zero Power Factor Lagging : dj jack mooney
What is Three Wattmeter Method and Its Working
WebThis method uses three watt meters to monitor all three phases. One wattmeter measures voltage between the R and T phases, a second wattmeter measures voltage between the … WebAug 29, 2024 · Power = Vphase-to-phase x Iphase x sqrt (3) x power factor. This is because Vphase = Vphase-to-phase / sqrt (3) And you have 3 phases with equal power so Total power = Vphase-to-phase / sqrt (3) x Iphase x 3 = Vphase-phase x sqrt (3) x Iphase Power factor can be measured or inferred from AC motor theory (much on web) Share Cite Follow WebFrom the above discussion it is clear that the power in a three-phase load, whether balanced or unbalanced, star-connected or delta-connected, three-wire or four wire, can be measured with only two wattmeters as shown in Fig. 9.46. In fact, the two wattmeter method of measuring power in three-phase loads has become a universal method. c 計算時間 測定