Upper limit for measured currents, active/reactive-power is 2.4 times rated value.
Upper limit for measured voltages and frequency is 1.2 times rated value.
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 541: 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
M11874-431 v5
Number of instances: 3
Function type parameter for each block in private range.
Information number must be selected for measurands.
Section 18 1MRK 505 394-UEN A
Station communication
734 Line differential protection RED650 2.2 IEC
Technical manual
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