ABB RELION Series, Руководство по протоколу связи

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Binary inputs which are not of “Static-Only” type can be assigned to any DNP3 event
class. Furthermore, it is possible to invert the signals if necessary, for example, generic
input data.
The default variation for all binary input values can be set with the Default Var Obj 01
parameter.
3.5.2 Double point inputs
Double Bit input (object type 3) is supported by the protection relay. Double point
objects are derived from the protection relay's internal data class DPC, that is, circuit
breaker and disconnector position data. An alternative DNP3 analog input data always
exists for the double point data. If the DNP3 client does not support object type 3, the
analog input is the only other alternative for representing the double point value in one
DNP3 data object.
The DNP3 Double Bit input event buffer size is 100.
3.5.3 Analog inputs
DNP3 analog input data (Object type 30) is mainly derived from the protection relay’s
IEC 61850 measurand object classes MV and CMV. Since the MV and CMV source
values are of float32 type, the default setting for the default variation of DNP3 analog
data is float32.
If needed, the default variation can be changed to integer 16 or 32 bit types. In such
case, re-scaling of the original data has to be applied.
There are four scaling options associated with analog input reporting.
• None: The value is presented as is. None of the configured values in the
Communication Management tool columns Min Source Value, Max Source
Value, Min Dest Value and Max Dest Value has any effect.
• Multiplication: The process value is multiplied by a constant. An offset is added
producing the reported value. In the Communication Management tool the
constant is found in the Max Dest Value column and the offset in the Min Dest
Value column.
• Division: The process value is divided by a constant. An offset is added by
producing the reported value. In the Communication Management tool the
constant is found in the Max Dest Value column and the offset in the Min Dest
Value column.
• Ratio
•
Configuration-time ratio scaling: Find R for new set of {source_min,
source_max, Dest_min, Dest_max}
• R = (out_max - out_min)/(in_max - in_min)
• Reported value = (inval - in_min) * R + out_min.
Section 3
1MRS758757 A
Vendor-specific implementation
20 REC615 and RER615
Communication Protocol Manual