16
IM 701450-61E
Automated Measurement of Power Analysis Parameters on Dual Areas
Power analysis parameters can be selected for measurement parameters in the same
fashion as normal automated measurement described above (automated measurement
on single area).
Determining the Power Analysis Parameter Values
u(t)
2
dt
1
T
0
T
u(t)
dt
1
T
0
T
Urms
Irms
P
S
u(t)
dt
1
T
0
T
π
2
2
u(t)
dt
1
T
0
T
Urms
2
– Udc
2
S
2
– P
2
Urms
•
Irms
u(t)
•
i(t) dt
1
T
0
T
Urms
Umn
Urmn
Udc
Uac
U+pk
UP-P
DC component
Udc
True rms value
Urms
AC component
Uac
Rectified mean value calibrated
to the rms value
Umn
Rectified mean value
Urmn
Amplitude
UP-P
Maximum value
U+pk
Minimum value
U-pk
U-pk
Active power P [W]
Reactive power Q [var]
Apparent power S [VA]
Power factor
λ
Impedance of the load circuit
Z [
Ω
]
Power Analysis Parameter
Voltage
U [V]
Method of Determination, Equation
Maximum value
Amplitude
Minimum value
(equivalent to the
standard measurement
parameter P-P)
(equivalent to the
standard measurement
parameter Max)
(equivalent to the
standard measurement
parameter Min)
i(t)
2
dt
1
T
0
T
i(t)
dt
1
T
0
T
i(t)
dt
1
T
0
T
π
2
2
i(t)
dt
1
T
0
T
Irms
2
– Idc
2
Irms
Imn
Irmn
Idc
Iac
I+pk
IP-P
DC component
Idc
True rms value
Irms
AC component
Iac
Rectified mean value calibrated
to the rms value
Imn
Rectified mean value
Irmn
Amplitude
IP-P
Maximum value
I+pk
Minimum value
I-pk
I-pk
Current
I [A]
Wp
Wp+
Wp–
Watt hour
[Wh]
Wp
is the sum of positive and negative watt hours.
Wp+
is the sum of positive
P
(consumed watt hours).
Wp–
is the sum of negative
P
(watt hours returned to the power supply).
q
is the sum of positive and negative
Idc
(ampere hours).
q+
is the sum of positive
Idc
(ampere hours).
q–
is the sum of negative
Idc
(ampere hours).
Ampere hour
[Ah]
q
q+
q–
u(t)
•
i(t)
dt
0
T
i(t)
dt
0
T
Joule integral I
2
t
[A
2
s]
i
2
(t)
dt
0
T
Maximum value
Amplitude
Minimum value
(equivalent to the
standard measurement
parameter P-P)
(equivalent to the
standard measurement
parameter Max)
(equivalent to the
standard measurement
parameter Min)
u(t)
•
i(t) : Instantaneous Power
Note
•
T
in the table above is the time range of measurement specified when performing automated
measurement. For the measurement range, see section 10.6 in the
DL7440/DL7480 User’s
Manual
.
•
u(t)
and
i(t)
denote the sampled data of the voltage signal and the current signal, respectively.
•
You cannot select power analysis parameters on the trend display (Measurement Trend) of
the Web server function of the DL7400.
5 Performing Automated Measurement of Power Analysis Parameters
