GE EPM 9650/9800 - page 294

6-12
The formula to use for EPM 9650s with regular hardware or EPM 9800s is:
SampleGained
FactorGain
x
SampleUngained _
65536
_
16384
_
=
Example for EPM 9650 with regular hardware or EPM 9800:
Ungained Voltage Sample = 0x01234 = 4660
Gain Factor = 421.905579 = 0x001A5E7D4 = 27650004
000000.120
65536
27650004
16384
4660
= x
•The next 22 bytes are the RMS Gain Factors. The order of these factors is:
VCA
VBC
VAB
VAUX
VCN
VBN
VAN
IAUX
IC
IB
IA
•The remaining 114 bytes are unused.
The formula to use for EPM 9650s with 300V hardware is:
SampleGained
FactorGain
x
SampleUngained _
32768
_
16384
_
=
The resulting answer is 120.000000 Volts secondary (240.000000 for the example below).
Example for EPM 9650 with 300V hardware:
Ungained Voltage Sample 0x01234 = 4660
Gain Factor = 834.81116 = 0x01A5E7D4 = 27650004
000000.240
32768
27650004
16384
4660 =x