D20/D200 Technical Overview
GE Grid Solutions
62
PRPI-019-3.00-10
GE Information
2.4.11 D20AC, AC Analog Input Peripheral
The D20AC, AC analog input peripheral provides AC analog computing and monitoring. It has
the following features and specifications:
Table 18 D20AC Features and Specifications
Item
Description
Features
Up to 132 analog values and 18 accumulator values.
Accommodates direct AC analog inputs from current and voltage
transformers for up to three 3-phase circuits, eliminating the need for
transducers and/or metering IEDs
Integrates key substation functions such as metering, analog processing
and power quality measurement
3-element and 1-element (Balance System) metering
Meter calculations include kW, kVAR, power factor, frequency, kWh,
kVARh, kVAh and symmetrical components.
Power quality data: %THD (total harmonic distortion), 21
st
harmonic
DSP/Memory
24-bit program, 16-bit point data
16 MHz clock
1K x 16-bit internal data
2K x 24-bit internal program
14K x 24-bit external program
64K byte EPROM boot
Dual-port memory 2K bytes
CCU base system required
AC Voltage Inputs
Up to 6 nominal RMS inputs: 63.5 VAC, 110 VAC (60 Hz), 69.3 VAC, 120
VAC (60 Hz)
Accuracy
+ 0.2% of nominal full scale
Burden
< 0.1 VA
Measurement Range
250% of nominal
Continuous Over voltage
250% of nominal
Frequency Response
50/60 Hz filtered, 1300 Hz unfiltered
Sample Rate
64 samples per cycle
AC Current Inputs
Up to 9 nominal RMS inputs: 1.0 A or 5.0 A (50/60 Hz)
Accuracy
•
+ 0.2% of nominal (minimum input 2% of nominal)
•
+ 1.0% 5 x nominal full scale
•
+ 2.0% 10 x nominal full scale
•
+ 3.0% 16 x nominal full scale
Burden
<0.01 ohm
Thermal Overload
•
4 x nominal – continuous
•
30 x nominal – 10s
•
100 x nominal – 1 s
