Measurement Ranges and Accuracy
The accuracy of the current measurements depends on both the value displayed (or transmitted) and the circuit-breaker rating (In):
-
Below 0.1 x In, measurements are not significant
-
Between 0.1 x In and 0.2 x In, accuracy changes linearly from 4 % to 1.5 %
-
Between 0.2 x In and 1.2 x In, accuracy = 1.5 %
The resolution for the current is one Ampere.
The resolution for the voltage is one Volt.
The resolution for power is one kW, kVar, kVA.
The resolution for energy is one kWh, kVarh, kVAh.
|
Measurement |
MicroLogic |
Accuracy at 25 °C |
Measurement range for specified accuracy |
|
|---|---|---|---|---|
|
Instantaneous current |
I1, I2, I3 |
A, E |
±1.5 % |
0.2 x In ... 1.2 x In |
|
IN |
A, E |
±1.5 % |
0.2 x In ... 1.2 x In |
|
|
I |
A, E |
±10 % |
0.2 x In ... In |
|
|
I |
A, E |
±1.5 % |
0 to 30 A |
|
|
Current maximeters |
I1 max, I2 max, I3 max |
A, E |
±1.5 % |
0.2 x In ... 1.2 x In |
|
IN max |
A, E |
±1.5 % |
0.2 x In ... 1.2 x In |
|
|
Demand current |
I1, I2, I3 |
A, E |
±1.5 % |
0.2 x In ... 1.2 x In |
|
IN |
A, E |
±1.5 % |
0.2 x In ... 1.2 x In |
|
|
Demand current maximeters |
I1max, I2 max, I3 max |
A, E |
±1.5 % |
0.2 x In ... 1.2 x In |
|
IN max |
A, E |
±1.5 % |
0.2 x In ... 1.2 x In |
|
|
Phase-to-phase voltages (3 and 4-wire systems) |
V12 |
E |
±0.5 % |
100 ... 690 V |
|
V23 |
E |
±0.5 % |
100 ... 690 V |
|
|
V31 |
E |
±0.5 % |
100 ... 690 V |
|
|
Phase-to-neutral voltages (4-wire systems) |
V1N |
E |
±0.5 % |
100 ... 690 V |
|
V2N |
E |
±0.5 % |
100 ... 690 V |
|
|
V3N |
E |
±0.5 % |
100 ... 690 V |
|
|
Average voltage |
Vavg |
E |
±0.5 % |
0 ... 100 % |
|
Voltage unbalance |
U unbal |
E |
±0.5 % |
0 ... 100 % |
|
Instantaneous power |
P (per phase) |
E |
±2 % |
30...2000 kW |
|
Q (per phase) |
E |
±2 % |
30...2000 kVar |
|
|
S (per phase) |
E |
±2 % |
30...2000 kVA |
|
|
Power maximeters |
P max (per phase) |
E |
±2 % |
30...2000 kW |
|
Q max (per phase) |
E |
±2 % |
30...2000 kVar |
|
|
S max (per phase) |
E |
±2 % |
30...2000 kVA |
|
|
Demand power |
P (per phase) |
E |
±2 % |
30...2000 kW |
|
S (per phase) |
E |
±2 % |
30...2000 kVA |
|
|
Demand power maximeters |
P max (per phase) |
E |
±2 % |
30...2000 kW |
|
Instantaneous power factor |
PF |
E |
±2 % |
0 ... +1 |
|
Total energy |
Ep |
E |
±2 % |
-1010 GWh ... +1010 GWh |
|
Eq |
E |
±2 % |
-1010 GVArh ... +1010 GVArh |
|
|
Es |
E |
±2 % |
-1010 GVAh ... +1010 GVAh |
|