GE MiCOM P40

3 DATA RESAMPLING
An IEC 61850-9-2LE SV interface receives 80 Sampled Values per cycle from the Process Bus. This is the same for
both 50 and 60 Hz. The SV interface then resamples these Sampled Values to make the data appear the same to
the IED as analogue signals would do on its normal inputs from CTs and VTs. The resampling frequency depends
on the device.
The IEC 61850-9-2LE interface also tracks the supply frequency. This is because the Sampled Values from the
Process Bus are fixed at 4000 samples/sec for 50 Hz and 4800 samples/sec at 60 Hz.
V03701
SV IED
VA
VB
VC
VN
IA
IB
IC
IN
Sampled Values
(80 samples per cycle)
CPU
Analog
Merging Unit
IEC 61850
SV
Interface
Process Bus
Resampling
Figure 32: Data sampling using an IEC 61850-9-2LE interface
P446SV Chapter 6 - Sampled Value Operation
P446SV-TM-EN-1 97