90E36 Datasheet, PDF (70/79 Pages) Integrated Device Technology – Poly-Phase High-Performance Wide-Span Energy Metering IC

90E36
POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
7.2 METERING/ MEASUREMENT ACCURACY
7.2.1 METERING ACCURACY
Metering accuracy or energy accuracy is calculated with relative
error:
γ
=
E_mea − E_real
E_real
×100%
Where E_mea is the energy measured by the meter, E_real is the actual
energy measured by a high accurate normative meter.
Table-15 Metering Accuracy for Different Energy within the Dynamic Range
Energy Type
Energy Pulse
ADC Range
When Gain=1
Metering Accuracy^{note 1}
Active energy
CF1
(Per phase and all-phase-sum)
PF=1.0 120µV-720mV
PF=0.5L, 180µV-720mV
0.1%
PF=0.8C, 150µV-720mV
Reactive energy
CF2
(Per phase and all-phase-sum)
sinФ=1.0 120µV-720mV
sinФ=0.5L, 180µV-720mV
0.2%
sinФ=0.8C, 150µV-720mV
Apparent energy
CF2
(Per phase and arithmetic all-phase-sum)
600µV-720mV^{note 2}
0.2%
Apparent energy (Vector sum)
CF2
120µV-720mV
0.5%
Fundamental active energy
CF3
(Per phase and all-phase-sum)
PF=1.0 120µV-720mV
PF=0.5L, 180µV-720mV
0.2%
PF=0.8C, 150µV-720mV
Harmonic active energy
CF4
(Per phase and all-phase-sum)
PF=1.0 120µV-720mV
PF=0.5L, 180µV-720mV
0.5%
PF=0.8C, 150µV-720mV
Note 1: All the parameters in this table is tested on IDT’s test platform.
Note 2: Apparent energy is tested using active energy with unity power factor since there’s no standard for apparent energy. Signal below 600 µV is not tested.
Electrical Specification
70
December 9, 2011