F.13
Date Code 20170927 Instruction Manual SEL-751 Relay
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 the IEC 61850 guidelines.
Table F.8 defines the data class Arc-Flash Detection. This class represents
Arc-Flash Detection status.
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 depend on the presence and
configuration of the RTD module(s).
Table F.7 New Logical Node Extensions
Logical Node
IEC
61850
Description or Comments
Arc Flash Detection PAFD This LN shall be used to represent Arc Flash Detection status.
Thermal Measurements (for equipment or
ambient temperature readings)
MTHR This LN shall be used to represent values from RTDs and to calculate
thermal capacity and usage mainly used for Thermal Monitoring.
Thermal Metering (IEC Thermal Elements) MTHE This LN shall be used to represent IEC Thermal Element Metering values.
Metering Statistics MSTA This LN shall be used for power system metering statistics.
Demand Metering Statistics MDST This LN shall be used for calculation of demand currents in a three-phase
system. This shall not be used for billing purposes.
Table F.8 Arc-Flash Detection Logical Node Class Definition
PAFD Class
Data Object Name
Common
Data Class
Explanation T
a
a
Transient data objects—the status of data objects with this designation is momentary and must be logged or reported to provide evidence
of their momentary state.
M/O/C/E
b
b
M: Mandatory; O: Optional; C: Conditional; E: Extension.
LNName Shall be inherited from Logical-Node Class (see IEC 61850-7-2).
Common Logical Node Information
LN shall inherit all Mandatory Data from Common Logical Node Class. M
Data Objects
Status Information
Str ACD Start E
Op ACT Operate T E
Table F.9 Thermal Metering Data Logical Node Class Definition (Sheet 1 of 2)
MTHR Class
Data Object Name
Common
Data Class
Explanation T
a
M/O/C/E
b
LNName The name shall be composed of the class name, the LN-Prefix, and the
LN-Instance-ID (according to IEC 61850-7-2).
Common Logical Node Information
LN shall inherit all Mandatory Data from Common Logical Node Class. M
EEHealth INS External equipment health (RTD Communications Status) E
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