A Three-phase 440-volt motor operates with a power factor of 0.4. Two Wattmeter's are connected to measure the input power, and the total power from the mains is 30KW Find the readings of each Wattmeter Lecture and Refer-1.9 and Discussion]

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3. A Three-phase 440-volt motor operates with a power factor of 0.4. Two Wattmeter's are
connected to measure the input power, and the total power from the mains is 30K Find
the readings of each Wattmeter
_[Lecture and Refer-1.9 and Discussion]
Hint: Power factor coso=0.4
Total input power =
Therefore W1+W2 30KW-
tano = 13 (W2-W1)/(W1+W2)
30KW
(1)
%3D
W2-W1 =
(2)
Solving equation (1) and (2)
W1=
Watts
W2%3D
--Watts
CFocus
Transcribed Image Text:3. A Three-phase 440-volt motor operates with a power factor of 0.4. Two Wattmeter's are connected to measure the input power, and the total power from the mains is 30K Find the readings of each Wattmeter _[Lecture and Refer-1.9 and Discussion] Hint: Power factor coso=0.4 Total input power = Therefore W1+W2 30KW- tano = 13 (W2-W1)/(W1+W2) 30KW (1) %3D W2-W1 = (2) Solving equation (1) and (2) W1= Watts W2%3D --Watts CFocus
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