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11.2 Standard Specifications
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Processing and calculation
Measurement
item
Processing/ calculation
Voltage (
U
)
u
converted to analog by RMS circuit and MEAN circuit
Current (
I
)
i
converted to analog by RMS circuit
Active power (
P
)
P
=
ui
subject to analog processing by multiplier circuit
Apparent power
(
S
)
S
=
U
×
I
Peak current (
I
p) Waveform peak detect circuit of
i
Reactive power
(
Q
)
Q
=s
S
2
-
P
2
Power factor (
λ
)
λ
= s|(
P
/
S
)|
Phase angle (
φ
)
φ
=s cos
-1
|
λ
|
Integration power (Total
P
from start of integration)/(Number of values per hour)
Integration
current
(Total
I
from start of integration)/(Number of values per hour)
1. u, i: instantaneous waveform of voltage and current
2. U, I, P: measurement values of voltage, current, and active power
(rounding error for display ±1 dgt. is not included)
3. s: lead or lag of the phase for each channel
"-": when the current phase against voltage is lead
no sign: when the current phase against voltage is lag
4. Computing accuracy is ±1 dgt. for the calculate value from measurement
value on display.
5. The number of data for 1 hour = update display (5 time/second)×seconds for
hour (3600) = 18000
6. When |P|>|S|, S is value of |P|.
7. When the input for each channels of U, I,orP results in "o.r." (out of
range), the item for "o.r" is calculated as input of 130%f.s
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