The upper limit is the maximum value that can be encoded into the ASDU
(Application Service Data Unit). Any value higher than this value will be tagged as
OVERFLOW. The factors 1.2 and 2.4 are taken from the 103 standard and require that
a rated value to use as base exists, and then use 1.2 or 2.4 times <rated> as
maxVal
.
You can use 2.4 times rated as
maxVal
, but as there is no way to propagate value to
client, the use of a scale factor on <rated> does not make much difference.
You can configure client:
client-scaled-max ::= 1.2 * <rated>
or
client-scaled-max ::= 1.0 * <maxVal>
If the client has a hard-coded gain of 1.2 * <rated> then
client-scaled-
max ::= 1.2 times <maxVal>/1.2
Resolution is <maxVal> / 4095 and hence the lowest possible
maxVal
yields the best
accuracy.
Table 785:
I103MEAS supported indications
INF
Description
148
IL1
144, 145,
146, 148
IL2
148
IL3
147
IN, Neutral current
148
UL1
148
UL2
148
UL3
145, 146
UL1-UL2
147
UN, Neutral voltage
146, 148
P, active power
146, 148
Q, reactive power
148
f, frequency
Measurands in private range, I103MEASUSR
Number of instances: 3
Function type parameter for each block in private range.
Information number must be selected for measurands.
Section 18
1MRK502052-UEN B
Station communication
1056
Technical manual
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