Basler Electric DGC-2020ES - Manual (Page 186)

178 9469200990 Rev C
Accuracy
* ......................................... ±3.0% of programmed rated current or ±3 Aac
Display Resolution ........................... 1 Aac
* Current metering indicates 0 A when generator current is below 2% of the full-scale rating.
Generator and Bus Frequency
Frequency is sensed through the generator and bus voltage inputs (phases A and B).
Metering Range ................................ 10 to 72 Hz
Accuracy...........................................
±0.25% or 0.05 Hz
Display Resolution ........................... 0.1 Hz
Apparent Power
Indicates total kVA and individual line kVA (4-wire, line-to-neutral or 3-wire, line-to-line).
Measurement/Calculation Methods
Total ................................................. kVA = (V
L-L
× I
L
×√3) ÷ 1000
4-Wire, Line-to-Neutral ..................... kVA calculated with respect to neutral
3-Wire, Line-to-Line .......................... A-phase kVA = V
AB
× I
A
÷ 1000 ÷ √3
B-phase kVA = V
BC
× I
B
÷ 1000 ÷ √3
C-phase kVA = V
CA
× I
C
÷ 1000 ÷ √3
Accuracy...........................................
±5% of the full-scale indication or ±6 kVA ∗
∗ Applies when temperature is between −40°C to +70°C. KVA metering indicates 0 kVA when the
generator kVA is below 2% of the full-scale rating.
Power Factor
Metering Range ................................ 0.2 leading to 0.2 lagging
Calculation Method .......................... PF = cosine of the angle between phase AB voltage (Vab) and
phase A current (Ia)
*
Accuracy...........................................
±0.02 †
* In single-phase AC-connected machines, it is the cosine of the angle between phase CA voltage
(Vca) and phase C current (Ic).
† Applies when temperature is between –40
°C to +70°C (–40°F to +158°F).
Note
For the DGC-2020ES to correctly meter power factor, the generator
must be rotating in the same phase sequence as dictated by the
generator phase rotation setting.
Real Power
Indicates total kW and individual line kW (4-wire, line-to-neutral or 3-wire line-to-line)
Measurement/Calculation Methods
Total ................................................. PF
× Total kVA
4-Wire, Line-to-Neutral ..................... kW calculated with respect to neutral
3-Wire, Line-to-Line .......................... A-phase kW = V
AB
× I
A
× PF ÷ 1000 ÷ √3
B-phase kW = V
BC
× I
B
× PF ÷ 1000 ÷ √3
C-phase kW = V
CA
× I
C
× PF ÷ 1000 ÷ √3
Accuracy...........................................
±5% of the full-scale indication or ±4 kW ∗
∗ Applies when temperature is between –40°C to +70°C. KW metering indicates 0 kW when the
generator kW is below 2% of the full-scale rating.
Specifications DGC-2020ES