TransformerEnd

Class Description

A conducting connection point of a power transformer. It corresponds to a physical transformer winding terminal. In earlier CIM versions, the TransformerWinding class served a similar purpose, but this class is more flexible because it associates to terminal but is not a specialization of ConductingEquipment.

Attributes

Name Type Description
bmagSat PerCent Core shunt magnetizing susceptance in the saturation region.
endNumber Integer Number for this transformer end, corresponding to the end’s order in the power transformer vector group or phase angle clock number. Highest voltage winding should be 1. Each end within a power transformer should have a unique subsequent end number. Note the transformer end number need not match the terminal sequence number.
grounded Boolean (for Yn and Zn connections) True if the neutral is solidly grounded.
magBaseU Voltage The reference voltage at which the magnetizing saturation measurements were made.
magSatFlux PerCent Core magnetizing saturation curve knee flux level.
rground Resistance (for Yn and Zn connections) Resistance part of neutral impedance where ‘grounded’ is true.
xground Reactance (for Yn and Zn connections) Reactive part of neutral impedance where ‘grounded’ is true.

Relationships

Inherits from

Descendant classes

Leaf/Root class

IsLeaf IsRoot
False False

Associations

Source Class Cardinality Source Target Class Cardinality Target Source Name Source Assoc. Description Target Name Target Assoc. Description
TransformerCoreAdmittance 0..1 TransformerEnd 0..* CoreAdmittance Core admittance of this transformer end, representing magnetising current and core losses. The full values of the transformer should be supplied for one transformer end only. TransformerEnd All transformer ends having this core admittance.
TransformerEnd 0..* BaseVoltage 0..1 TransformerEnds Transformer ends at the base voltage. This is essential for PU calculation. BaseVoltage Base voltage of the transformer end. This is essential for PU calculation.
TransformerEnd 0..* Terminal 0..1 TransformerEnd All transformer ends connected at this terminal. Terminal Terminal of the power transformer to which this transformer end belongs.
TransformerEnd 1 RatioTapChanger 0..1 TransformerEnd Transformer end to which this ratio tap changer belongs. RatioTapChanger Ratio tap changer associated with this transformer end.
TransformerEnd 1 PhaseTapChanger 0..1 TransformerEnd Transformer end to which this phase tap changer belongs. PhaseTapChanger Phase tap changer associated with this transformer end.
TransformerEnd 0..* TransformerStarImpedance 0..1 TransformerEnd All transformer ends having this star impedance. StarImpedance (accurate for 2- or 3-winding transformers only) Pi-model impedances of this transformer end. By convention, for a two winding transformer, the full values of the transformer should be entered on the high voltage end (endNumber=1).
TransformerMeshImpedance 0..* TransformerEnd 1 FromMeshImpedance All mesh impedances between this ‘to’ and other ‘from’ transformer ends. FromTransformerEnd From end this mesh impedance is connected to. It determines the voltage reference.
TransformerMeshImpedance 0..* TransformerEnd 1..* ToMeshImpedance All mesh impedances between this ‘from’ and other ‘to’ transformer ends. ToTransformerEnd All transformer ends this mesh impedance is connected to.
WindingInsulation 0..* TransformerEnd 1 FromWindingInsulations FromWinding
WindingInsulation 0..* TransformerEnd 1 ToWindingInsulations ToWinding