Question
Download Solution PDFIn a 3 – phase motor, the voltage and current measured are as given below.
L1 : 230 V, 5 A
L2: 230 V, 4.5 A
L3: 230 V, 5.5 A
What’s the input power, assuming power factor of 1?Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Input power of 3 phase motor = 3 VP IP cos ϕ
Where,
VP = phase voltage
IP = phase current
cos ϕ = power factor
For different phase rating,
Input power of 3 phase motor = Vp1 Ip1 cos ϕ + Vp2 Ip2 cos ϕ + Vp3 Ip3 cos ϕ
Calculation:
Input power of 3 phase motor = (230 X 5 X 1) + (230 X 4.5 X 1) + (230 X 5.5 X 1)
Input power of 3 phase motor = 3,450 WattLast updated on Jun 11, 2025
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