GE D25 User Manual page 138

D25
User's Manual
CT/PT Modules,
Procedure: Metering Range Calibration
(0% - 195%) (continued)
Step
138
Continued
4. Using the D25 AC Input Engineering Value Displays (available
through the B050-0 WESMAINT application), record the raw
magnitude values for each input you are calibrating.
Verify that the reported values are within the following tolerances:
CT Type: 1A Part Number: 450-0107
For Test Current...
1.000 A ± 0.05%
rms
CT Type: 5A Part Number: 450-0108
For Test Current...
5.000 A ± 0.05%
rms
5. Calculate the 0-195% magnitude calibration factor for each input
using the data gathered in Step 4.
Use the following formula:
Magnitude Calibration Factor = expected value / measured value
For example, if the measured value is 2045, the magnitude
calibration factor is:
2048/2045 = 1.00147
6. Enter the calibration factors in the Magnitude (0% - 195%) column
for each input into the configuration
(under D25 AC Configuration > Calibration tab > Internal
Calibration tab).
7. Generate and download the configuration to the unit.
994-0081-3.00-21
Action
Expected Raw Value is...
2048
Expected Raw Value is...
2048
GE Grid Solutions
Tolerance
± 20 counts
Tolerance
± 20 counts
GE Information