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Power Calculations
• The power clamp processes the three sets of data and cal-
culates the true power (kW) of the system, which is shown
on the main display, and the power factor (PF), which is
shown on the upper display. RST is shown on the LCD dis-
play to indicate that this is a measurement of the total sys-
tem.
• Pressing the 3 φ KVAR KVA button toggles to display the
apparent power (kVA) of the system, which is shown on the
main display, and the reactive power (kVAR), which is
shown on the upper display.
• Pressing the READ NEXT button clears the stored data from
memory and readies the power clamp for another three
phase 3-wire calculation.
Note: The "+" sign on the jaw must face the power source
for correct measurement.
Note: In the 3 φ 4W power measurement, all three W
or W
must be positive. If one of the three phases has a
S
negative power, check the connections and clamping and
re-measure the phase to obtain correct power and power
factor measurements.
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Power Factor Corrections
A positive power factor indicates that an inductive load has
brought the power system out of phase. Based on the kVAR
values of the system, capacitors are available to improve the
power factor. By measuring the frequency, phase voltage and
kVAR of the system, you can calculate the capacitive load
required for this correction. Single phase capacitors can be
used in a 1 φ 2W or 3 φ 4W systems. Three phase capacitors are
available for 3 φ 3W and 3 φ 4W systems.
Determining the Required Capacitor Value
• Measure the kVAR
• The capacitor value required can be calculated based on the
following equation:
Capacitance (Farad) =
f = frequency rating of the system
V = phase voltage
• It is recommended that the KVAR value of the capacitor be a
little less that the measured value.
General Specifications
Indoor Use
Conductor Size:
Battery Type:
Display:
Range Selection:
Overload Indication:
or W
Power Consumption:
R
T
Low Battery Indication:
Sampling Time:
Operating Temperature: 4°C to 50°C
Operating Humidity:
Altitude:
Storage Temperature:
Storage Humidity:
value of the power system.
3 φ 3W
kVAR * 1000
2
2π fV
Cable φ 55mm (approx.)
Bus Bar 65mm (D) x 24mm (W)
9V
2 x 4 Digits Dual Display LCD
Auto
OL
25mA (approx.)
0.5 sec. (V and A)
1.6 sec. (W)
Less than 85% relative
Up to 2000M
-20°C to 60°C
Less than 75% relative
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