Table of Contents
Advertisement
φ
Calculation of 3
4W Power Factor (PF)
When measuring 3φ4W unbalanced power, use the REC button to record the individual power factors
(KW
, PF
, KW
R(L1)
R(L1)
be calculated using the following equation:
Improving the Power Factor of a 3
Measure the KVAR
R
Based upon the measured values, a 3φ or 1φ capacitor at the rated voltage and frequency can be used
to improve the power factor. To find the value of capacitance, refer to the following equation.
Capacitance(Farad) =
It is recommended that the KVAR value of the capacitor a somewhat less than the value measured.
Improving the Power Factor of a 3
1. Measure the KVAR 3φ value of a balanced system.
2. Based upon the measured value, a 3φ capacitor at the rated voltage and frequency can be used to
improve power factor.
3. To find the value of capacitance, refer to the equation in the section above.
4. It is recommended that the KVAR value of the capacitor be somewhat less than the value
measured.
Improving Power Factor of a 1
1. Measure KVAR value of a 1φ2W power system.
2. Based upon the measured value, users can purchase required capacitor at rated voltage and
frequency to improve power factor.
3. If value of capacitance is needed, obtain the value via the equation in the section entitled
"Improving Power Factor of 3-phase 4-wire System".
4. It is recommended that the KVAR value of the capacitor should be a little less than the value
measured.
NOTE: The indication of phase sequence is not limited to 3φ balanced power. It can be used in
general as long as the Power Factor is greater than 0.1.
, PF
, KW
, and PF
S(L2)
S(L2)
T(L3)
KW
R(L1)
KVA
=
PF
R(L1)
R(L1)
KVA
= KVA
3φW
R(L1)
KW
3φW
PF
=
KVA
3φW
3φW
φ
(or KVAR
), KVAR
L1
S
KVAR*1000
2
2πfV
φ
φ
2W Power System
) of each phase in memory. 3φ4W power factor can
T(L3)
KW
S(L2)
;KVA
=
;KVA
PF
S(L2)
S(L2)
+ KVA
+ KVA
S(L2)
4W Power System
(or KVAR
), and KVAR
L2
Balanced Power System
www.burntec.com
KW
S(L3)
=
PF
T(L3)
T(L3)
T(L3)
(or KVAR
) values of each phase.
T
L3
Where:
f: frequency in Hz
V: phase voltage
Advertisement
Table of Contents
