ABB REG316 4 Series - Page 382

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-344
The following table shows scaling examples for the most impor-
tant measured function variables.
Function Meas. variable Nominal value ‘MeasScale’
UIfPQ f (50Hz) 20000 2
UIfPQ P 820698 52
UIfPQ Q 820698 52
SynchroCheck
degrees (180
°)
31415 2
Power PN 1641397 105
‘MeasScale’ is given by: Margin
16535
valueNominal
+
Processor capacity:
The disturbance recorder function runs on the same central
processing unit (CPU) as the protection functions. The processor
capacity required by the disturbance recorder function as a per-
centage of the total capacity and in relation to the number of sig-
nals is:
· 20% for 9 analogue and 0 binary signals
· 40% for 9 analogue and 16 binary signals.
The disturbance recorder function will thus be generally confined
to recording the analogue variables and be triggered by the gen-
eral start or general trip signals. Changes in the states of binary
signals are nevertheless registered by the event recorder.
Recording duration:
The time during which data are recorded can be determined
from the following relationship:
t
n
ab
p
rec
=
-+´
+´
´
65535 1 22
12
(( ) )
(2 )
where t
rec
: max. recording time
n: Number of events recorded
a: Number of c.t. and v.t. channels recorded
b: Number of Bytes required for binary channels (one
Byte per eight binary signals)
p: duration of one cycle at power system frequency
(e.g. 20 ms for 50 Hz).