Transformer Index

Transformer Input Properties

Name	Units	Multi-band	Default Value	Validation Rule	Key Property	Description
AC Fixed Shift Angle	°	False	0		False	The fixed phase shift angle between the two windings of a single-phase transformer
AC Line Charging Susceptance	pu	False	0		False	The line-charging susceptance of a transformer
AC Tap Ratio	-	False	1	>0	False	The turns ratio of the primary winding of a transformer
Contingency Limit Penalty	$/MWh	False	-1		False	Penalty for exceeding contingency flow limits
Enforce Limits	-	False	1	In (0,1,2,3)	False	If flow limits are enforced regardless of Transmission [Constraint Voltage Threshold].
Fixed Loss	MW	False	0		False	Fixed loss on transformer
Forced Outage Rate	%	True	0	Between 0 And 100	False	Expected proportion of time the facility is unavailable due to forced outage
Formulate Upfront	Yes/No	False	0	In (0,-1)	False	If constraints should all be formulated upfront rather than checked iteratively.
Limit Penalty	$/MWh	False	-1		False	Penalty for exceeding the flow limits on the Transformer.
Loss Allocation	-	False	0.5	Between 0 And 1	False	Proportion of transformer losses allocated to the receiving node
Maintenance Frequency	-	True	0	≥0	False	Frequency of maintenance outages in an annual timeframe
Maintenance Rate	%	True	0	Between 0 And 100	False	Expected proportion of time the facility is unavailable due to maintenance
Max Time To Repair	h	True	0	≥0	False	Maximum time to repair (hr)
Mean Time to Repair	h	True	24	≥0	False	Mean time to repair (hr)
Min Time To Repair	h	True	0	≥0	False	Minimum time to repair (hr)
Must Report	Yes/No	False	0	In (0,-1)	False	If the Transformer must be reported regardless of Transmission [Report Voltage Threshold].
Outage Max Rating	MW	True	0		False	Transformer rating in the reference direction during outage
Outage Min Rating	MW	True	0		False	Transformer rating in the counter-reference direction during outage
Overload Rating	MW	False	0	≥0	False	Emergency rating in the reference direction
Random Number Seed	-	False	0	Between 0 And 2147483647	False	Random number seed assigned to the Line for the generation of outages
Rating	MW	False	0	≥0	False	Maximum MW rating
Reactance	pu	False	0		False	Together with any resistance this makes up the lines impedance
Repair Time Distribution	-	True	-1	In (-1,0,1,2,3,4,5,6,7)	False	Distribution used to generate repair times (Auto,Constant,Uniform,Triangular,Exponential,Weibull,Lognormal,SEV,LEV)
Repair Time Scale	-	True	0		False	Repair time function scale parameter (for exponential,Weibull,lognormal,SEV,LEV)
Repair Time Shape	-	True	0		False	Repair time function shape parameter (for Weibull,lognormal)
Resistance	pu	False	0		False	A measure of the transformer's opposition to the flow of electric charge
Screening Mode	-	False	1	In (0,1,2)	False	The set of transformers that should be screened for post-contingency flow under screen contingencies
Susceptance	pu	False	0		False	The reciprocal of the reactance of a circuit and thus the imaginary part of its admittance
Units	-	False	1	In (0,1)	True	Flag if transformer is in service
Units Out	-	False	0	In (0,1)	False	Number of [Units] out of service
x	-	True	0		False	Value to pass-through to solution
y	-	True	0		False	Value to pass-through to solution
z	-	True	0		False	Value to pass-through to solution

Transformer Constraints Input Properties

Name	Units	Multi-band	Default Value	Validation Rule	Key Property	Description
Flow Coefficient	MW	False	0		False	Coefficient of transformer flow equation

Transformer Objectives Input Properties

Name	Units	Multi-band	Default Value	Validation Rule	Key Property	Description
Flow Coefficient	MW	False	0		False	Coefficient of transformer flow equation

Transformer Output Properties

Name	Summary Name	Property Group	Phases	Multi-band	Description
Available Transfer Capability - MW	Available Transfer Capability - GWh	Capacity	LT Plan, MT Schedule, ST Schedule	False	Available transfer capability on the transformer.
Available Transfer Capability Back - MW	Available Transfer Capability Back - GWh	Capacity	LT Plan, MT Schedule, ST Schedule	False	Available transfer capability on the transformer in the counter-reference direction.
Discrete Maintenance - MW	Discrete Maintenance - GWh	Reliability	PASA	False	Planned reference direction capacity out of service
Discrete Maintenance Back - MW	Discrete Maintenance Back - GWh	Reliability	PASA	False	Planned counter-reference direction capacity out of service
Distributed Maintenance - MW	Distributed Maintenance - GWh	Reliability	PASA	False	Ideal reference direction capacity out on maintenance
Distributed Maintenance Back - MW	Distributed Maintenance Back - GWh	Reliability	PASA	False	Ideal counter-reference direction capacity out on maintenance
Export Cost - $	Export Cost - $000	Production	LT Plan, MT Schedule, ST Schedule	False	Cost of energy exported
Export Limit - MW	Export Limit - MW	Production	LT Plan, MT Schedule, ST Schedule	False	Maximum flow allowed on the transformer
Export Revenue - $	Export Revenue - $000	Production	LT Plan, MT Schedule, ST Schedule	False	Revenue from energy exported
Flow - MW	Flow - GWh	Production	LT Plan, MT Schedule, ST Schedule	False	Flow through the transformer (sent out)
Flow Back - MW	Flow Back - GWh	Production	LT Plan, MT Schedule, ST Schedule	False	Flow through the transformer in the counter-reference direction
Forced Outage - MW	Forced Outage - GWh	Reliability	LT Plan, MT Schedule, ST Schedule	False	Capacity forced out
Forced Outage Rate - %	Forced Outage Rate - %	Reliability	LT Plan, MT Schedule, ST Schedule	False	Proportion of installed capacity on forced outage
Hours Congested - h	Hours Congested - h	Production	LT Plan, MT Schedule, ST Schedule	False	Number of hours the Transformer is flowing at its [Rating].
Import Cost - $	Import Cost - $000	Production	LT Plan, MT Schedule, ST Schedule	False	Cost of energy imported
Import Limit - MW	Import Limit - MW	Production	LT Plan, MT Schedule, ST Schedule	False	Minimum flow allowed on the line
Import Revenue - $	Import Revenue - $000	Production	LT Plan, MT Schedule, ST Schedule	False	Revenue from energy imported
Loading - %	Loading - %	Production	LT Plan, MT Schedule, ST Schedule	False	Loading relative to thermal limit.
Loading Back - %	Loading Back - %	Production	LT Plan, MT Schedule, ST Schedule	False	Loading in the counter-reference direction relative to thermal limit.
Loss - MW	Loss - GWh	Production	LT Plan, MT Schedule, ST Schedule	False	Losses (sent out)
Loss Back - MW	Loss Back - GWh	Production	LT Plan, MT Schedule, ST Schedule	False	Losses on flows in the counter-reference direction
Maintenance - MW	Maintenance - GWh	Reliability	LT Plan, PASA, MT Schedule, ST Schedule	False	Total capacity out of service in the reference direction (discrete + distributed)
Maintenance Back - MW	Maintenance Back - GWh	Reliability	LT Plan, PASA, MT Schedule, ST Schedule	False	Total capacity out of service in the reverse reference direction (discrete + distributed)
Maintenance Rate - %	Maintenance Rate - %	Reliability	LT Plan, MT Schedule, ST Schedule	False	Proportion of installed capacity on maintenance outage
Max Flow - MW	Max Flow - MW	Production	LT Plan, MT Schedule, ST Schedule	False	Maximum flow
Min Flow - MW	Min Flow - MW	Production	LT Plan, MT Schedule, ST Schedule	False	Minimum flow
Overload Export Limit - MW	Overload Export Limit - MW	Production	LT Plan, MT Schedule, ST Schedule	False	Maximum post-contingency flow allowed on the transformer
Overload Import Limit - MW	Overload Import Limit - MW	Production	LT Plan, MT Schedule, ST Schedule	False	Minimum post-contingency flow allowed on the line
Rental - $	Rental - $000	Production	LT Plan, MT Schedule, ST Schedule	False	Transmission rent
Rental Back - $	Rental Back - $000	Production	LT Plan, MT Schedule, ST Schedule	False	Rental / settlement surplus in the counter-reference direction
Service Factor - %	Service Factor - %	Reliability	LT Plan, MT Schedule, ST Schedule	False	Proportion of installed capacity available for transfer
Shadow Price - $/MW	Shadow Price - $/MW	Production	LT Plan, MT Schedule, ST Schedule	False	Shadow/expansion price
Violation - MW	Violation - GWh	Production	LT Plan, MT Schedule, ST Schedule	False	Violation of flow limit
Violation Back - MW	Violation Back - GWh	Production	LT Plan, MT Schedule, ST Schedule	False	Violation of the flow limit in the counter-reference direction.
Violation Back Hours - h	Violation Back Hours - h	Production	LT Plan, MT Schedule, ST Schedule	False	Number of hours the flow limit is violated in the counter-reference direction.
Violation Cost - $	Violation Cost - $000	Production	LT Plan, MT Schedule, ST Schedule	False	Cost of violating flow limits
Violation Cost Back - $	Violation Cost Back - $000	Production	LT Plan, MT Schedule, ST Schedule	False	Cost of violating the flow limit in the counter-reference direction.
Violation Hours - h	Violation Hours - h	Production	LT Plan, MT Schedule, ST Schedule	False	Number of hours the Transformer Flow exceeds the [Rating].
Voltage - kV	Voltage - kV	Production	LT Plan, MT Schedule, ST Schedule	False	Voltage of the transformer
x	x	Pass-through	LT Plan, MT Schedule, ST Schedule	True	Value to pass-through to solution
y	y	Pass-through	LT Plan, MT Schedule, ST Schedule	True	Value to pass-through to solution
z	z	Pass-through	LT Plan, MT Schedule, ST Schedule	True	Value to pass-through to solution