EMO:Use of line conductor information in SFT

The behaviour of SFT constraints is now derived from information about the thermal characteristics of the lines involved. The information required by EMO to do this derivation is contained in two files, the Conductor Parameters file and the Circuit Configuration file.

Both these files are provided by Energy Link in the automatic downloads made by EMO. They will appear in the /Inputs/Grid/SFT directory. The Circuit Configuration file can be overridden by a manually edited file however. This is done by placing a file with the correct name format into a directory at /Inputs/Grid/SFT/Manual.

Conductor Parameters

The Conductor Parameters file contains information on the properties of the different types of conductors used in transpower lines. This is a csv file with a heading line and the following columns. The file is named 'Conductor_Parameters_<yyyyMMdd>.csv' where <yyyyMMdd> is the creation date. A number of these files may appear together but only the one with the latest date will be loaded.

Column	Meaning
Conductor Code	This is the code used to identify this type of cable
Conductor Description	a description, for reference only
Absorbivity	Average absorbance, the proportion of incoming radiative energy that is absorbed over naturally occurring frequencies
Coefficient of Resistance	The rate of change in resistance as temperature is increased
Resistance @20 C ohms/km	Electrical resistance
Mass per unit lemgth gm/cm	The mass or weight of the cable
Diameter mm	Diameter of the cable
Emissivity	Physical emissivity, which determines the rate at which heat is lost through radiation
Specific Heat Capacity Cal/g/C	Physical heat capacity, the amount of energy contained in a temperature rise in the cable material

Circuit Configuration

The Circuit Configuration describes the configuration of the circuit with regard to the cable type and number and the offload time used. The file is named 'Circuit Configuration_<yyyyMMdd>.csv' where <yyyyMMdd> is the creation date. A number of these files may appear together but only the one with the latest date will be loaded.

Column	Meaning
Branch Id	The branch id is used as the name of the circuit in EMO
Date	The date from which the information in the row is valid. If this column is empty the information is valid from teh earliest date possible
Limiting Conductor	the name of the cable type used in the conductor that sets the thermal limit of the line. This name needs to appear in the conductor code column in the Conductor Parameters file
Number of Conductors	the number of conductors used in the line.
SFT_Status (Y/N)	whether to apply SFT to theis line
Offload time (minutes)	the SFT offload time, or time window in which a thermal overload can occur.
Threshold	The threshold after which the constraint will be shown by EMO. This is expressed as a percentage of the constraint limit.