Sel SEL-787 - Logical Node Extensions; Table F.7 New Logical Node Extensions; Table F.8 Thermal Metering Data Logical Node Class Definition; Table F.9 Demand Metering Statistics Logical Node Class Definition

F.13
Date Code 20150130 Instruction Manual SEL-787 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 IEC 61850
guidelines.
Table F.8 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.9 defines the data class Demand Metering Statistics. This class is a
collection of demand currents and energy.
Table F.7 New Logical Node Extensions
Logical Node IEC 61850 Description or Comments
Thermal Measurements (for equipment or
ambient temperature readings)
MTHR This LN shall be used to represent values from RTDs and to calculate
thermal quantities for Thermal Monitoring.
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 Thermal Metering Data Logical Node Class Definition
MTHR Class
Attribute Name Attr. Type 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 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
Data Objects
Measured values
MaxAmbTmp MV Maximum Ambient Temperature E
MaxWdgTmp MV Maximum Winding Temperature E
Tmp MV Temperature E
Table F.9 Demand Metering Statistics Logical Node Class Definition (Sheet 1 of 2)
MDST Class
Attribute Name Attr. Type 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