17-3
IM CW240E
CW 240 Specifications
17
17.1 CW 240 Specifications
(2) Measurement Functions
Item
Voltage
Current/Active Power/Reactive Power 1 (using the reactive power method)
Method
Digital Sampling Method
Frequency Range
45 to 65 Hz (The measurement element is selected from U1, U2, and U3.)
Crest Factor
3 at rated input (1.8 at 1000V range)
Accuracy
Power Factor
Effects
_
Reactive
Factor Effects
Available Input
Range
5 to 110% of each range (The upper limit at 1000V range is 100%.)
Display Range
Temperature
Coefficient
±
0.03%rng/
°
C
±
0.05%rng/
°
C
Display Update Cycle Approx. 0.5 seconds
Voltage: 0.4 to 130% of each range (zero suppression for under 0.4%)
Electric Power (active, reactive, apparent): 0 to 130% of each range
(zero suppression for 0.17% or less of the range rating)
Harmonics Level: 0 to 130% of each range
Frequency:
_
±
0.2%rdg.
±
0.1%rng.
96030, 96031,96033,96036
±
0.6%rdg.
±
0.4%rng.
96032,96034,96035
±
1.0%rdg.
±
0.8%rng.
96030
±
1.0%rng.(45 to 65Hz,power factor =
±
0.5)
Excluding 96030
±
2.0%rng.(45 to 65Hz,power factor=
±
0.5)
96030
±
1.0%rng.(45 to 65Hz,reactive factor=
±
0.5)
Excluding 96030
±
2.0%rng.(45 to 65Hz,reactive factor=
±
0.5)
rdg: reading; rng: range
(3) Equations
Voltage RMS Value
U
m
rms
=
u
m
(
t
)
2
dt
=
∫
T
0
T
1
u
m
(
t
)
2
∑
T
t
=0
T
1
Current RMS Value
I
m
rms
=
i
m
(
t
)
2
dt
=
∫
T
0
T
1
i
m
(
t
)
2
∑
T
t
=0
T
1
Active Power
P
m
=
{
u
m
(
t
)
i
m
(
t
)}
dt
=
∫
T
0
T
1
{
u
m
(
t
)
i
m
(
t
)}
∑
T
t
=0
T
1
Reactive Power1: When using the reactive power method
Q
m
=
{
u
m
(
t
)
i
m
(
t
)
}
dt
=
∫
T
0
T
1
4
T
4
T
{
u
m
(
t
)
i
m
(
t
)
}
∑
T
t
=0
T
1
where
u(t) : Voltage Input Signal
i(t)
: Current Input Signal
T
: Input Signal 1 Cycle
m
: Phase