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8.2. MEASUREMENT FORMULAS
PEL measures 128 samples per cycle (16 at 400 Hz) and calculates the voltage, current and active power quantities over one cycle.

Quantities Formula Comments
AC RMS phase-to-neutral voltage
(VL)
vL = v1, v2 or v3 elementary sample
N = Number of samples
DC voltage (VL)L = v1, v2 or v3 elementary sample
N = Number of samples
AC RMS phase-to-phase voltage
(UL)
ab = u12, u23 or u31 elementary sample
N = Number of samples
AC RMS Current (IL)iL = i1, i2 or i3 elementary sample
N = Number of samples
DC Current (IL)iL = i1, i2 or i3 elementary sample
N = Number of samples
Voltage crest factor (V-CF) CFVL is the ratio of average crest values to the RMS
value of 10/12 periods
Current crest factor (I-CF) CFIL is the ratio of average crest values to the RMS
value of 10/12 periods
Unbalance (u2)
real-time only
with
22
31
2
23
2
12
4
31
4
23
4
12
)( fundfundfund
fundfundfund
UUU
UUU
++
++
=
β
Active Power (PL)
L = I1, I2 or I3 elementary sample
N = Number of samples PT[1s]= P1[1s] + P2[1s] +
P3[1s]
Reactive Power (QL)
Reactive power includes harmonics.
"sign[1s]" is the reactive power sign
The total reactive power calculated QT[1s] is a vector.
Apparent Power (SL)
The total apparent power ST[1s] is an arithmetic value
Power Factor (PFL)
Cos ϕL
Cos ϕL 󰀨
the phase of the fundamental of the current I and the
phase of the fundamental of the phase-to-neutral
voltage V for 10/12 cycles values
Tan ΦQ[10/12] and P[10/12] are the 10/12-period values for
Q and P.
AC consumed active energy (EP+)
+
+
=
x
TP
PE
AC generated active energy (EP-)
( )
×= 1
x
TP
PE
AC reactive energy in quadrant
1 (EQ1)
=
1
1
x
q
TQ
QE
AC reactive energy in quadrant
2 (EQ2)
=
2
2
x
q
TQ
QE
71


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