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 901: I103MEAS supported indications
INF Description
148 I_A
144, 145,
146, 148
I_B
148 I_C
147 IN, Neutral current
148 V_A
148 V_B
148 V_C
145, 146 V_A-V_B
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.
Table 902: I103MEASUSR supported indications
INF FUN GI TYP COT Description
*
1)
*
2)
No, polled
with CL2
*
3)
2,7 Meas1
* * No, polled
with CL2
* 2,7 Meas2
* * No, polled
with CL2
* 2,7 Meas3
Table continues on next page
1MRK 502 066-UUS B Section 18
Station communication
1187
Technical manual
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