Sel 751A - Logical Node Extensions; Table F.8 Metering and Measurement Logical Nodes; Table F.9 Thermal Metering Data

F.16
SEL-751A Relay Instruction Manual Date Code 20100129
IEC 61850 Communications
Logical Node Extensions
Logical Node Extensions
The following Logical Nodes and Data Classes were created in this device as
extensions to the IEC 61850 standard, in accordance with IEC 61850
guidelines.
Table F.9 defines the data class, Thermal Metering Data. This class is a
collection of simultaneous measurements (or evaluations) that represent the
RTD thermal metering values. Valid data depends on the presence and
configuration of the RTD module(s).
Table F.8 Metering and Measurement Logical Nodes
Logical Node IEC 61850 Description or comments
Thermal Measurements
—for equipment or ambient temperature
readings
MTHR To acquire values from RTDs and to calculate thermal capacity
and usage mainly used for Thermal Monitoring.
Demand Metering Statistics MDST This LN shall be used for calculation of demand currents and
energy in a three-phase system. This shall not be used for billing
purposes
Table F.9 Thermal Metering Data
Attribute Name Ty pe Explanation T M/O
MTHR Class
LNName Shall be inherited from Logical-Node Class (see IEC 61850-7-2).
Data
Common Logical Node Information
LN shall inherit all Mandatory Data from Common Logical Node Class. M
EEHealth INS External equipment health (RTD Communications Status) O
Measured Values
MaxWdgTmp MV Maximum Winding Temperature O
MaxBrgTmp MV Maximum Bearing Temperature O
MaxAmbTmp MV Maximum Ambient Temperature O
MaxOthTmp MV Maximum Other Temperature O
Tmp01 MV Temperature 1 O
Tmp02 MV Temperature 2 O
Tmp03 MV Temperature 3 O
Tmp04 MV Temperature 4 O
Tmp05 MV Temperature 5 O
Tmp06 MV Temperature 6 O
Tmp07 MV Temperature 7 O
Tmp08 MV Temperature 8 O
Tmp09 MV Temperature 9 O
Tmp10 MV Temperature 10 O
Tmp11 MV Temperature 11 O
Tmp12 MV Temperature 12 O