73
4.2.16 Measurement of Apparent AC+DC Power
Measurement
Range (2) (4)
5 to
9999VA
10.00 to
99.99kVA
100.0 to
999.9kVA
1000 to
1500kVA (1)
Specified
Measurement
Range
1 to 100% of the
measurement range
0 to 100%
of the measurement range
Accuracy (3)
1000A
± (2% R +10cts)
1000 to 2000A
± (2.5% R +10cts)
1000A
± (2% R +3cts)
1000 to 2000A
± (2.5% R +3cts)
Resolution
1VA
10VA
100VA
1000VA
Note (1)
- Display of OL above 1500 kVA in single-phase (1000V x 1000A).
- Bandwidth in AC in voltage = 3 kHz, in current = 2 kHz
Notes (2), (3) and (4)
of the previous § apply
4.2.17 Measurement of Reactive AC Power
Measurement
Range (2) (4)
5 to
9999 var
10.00 to
99.99 kvar
100.0 to
999.9 kvar
1000 kvar (1)
Specified
Measurement
Range
1 to 100% of the
measurement range
0 to 100%
of the measurement range
Accuracy
(3) (7)
± (2% R +10cts)
± (2% R +3cts)
Resolution
1 var
10 var
100 var
1 kvar
Note (1)
- Display of OL above 1000 kvar in single-phase (1000V x 1000A).
- Bandwidth in AC in voltage = 3 kHz, in current = 2 kHz
Notes (2), (3) and (4)
of the previous § apply
Note 5
In single-phase, the sign of the reactive power is determined by the
phase lead or lag between the V and I signs, while in balanced three-
phase, it is determined by the calculation on the samples.
Note 6
- Signs of reactive powers according to the four-quadrant rule (§4.2.12):
Quadrant 1: Reactive power Q
sign +
Quadrant 2: Reactive power Q
sign +
Quadrant 3: Reactive power Q
sign -
Quadrant 4: Reactive power Q
sign –
Note (7)
Measurement stabilization ~8 sec
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