Greenlee CMPL-100, Instruction Manual

Page: 18 / 64

18
Typical Measurements (cont’d)
Three-Phase Four-Wire Measurements:
True Power, Power Factor and Apparent Power Measurement
The selector is set for Power Factor in the illustrations.
Use the correct setting for the desired measurement.
R (L1)
3ø4W
S (L2)
T (L3)
N
A
3ø
Load
W
T (L3)
Notes:
• The + sign on the jaw must face the power source.
• A positive (+) PF indicates an inductive load. A negative (–) PF indicates a capacitive load.
Power factor value is correct for balanced loads only.
• All three power measurements (W
R
, W
S
and W
T
) should be positive. Check test lead
connection and clamping of jaw if any power measurement is negative.
Three-Phase Four-Wire Balanced Loads
W
3Ø4W
= W
R
+ W
S
+ W
T
KVA
3Ø4W
= 3 (KVA
R
)
KVAR
3Ø4W
= [KVA
3Ø4W
]
2
– [KW
3Ø4W
]
2
PF
3Ø4W
= KW
3Ø4W
KVA
3Ø4W