PowerTransformerEnd
A PowerTransformerEnd is associated with each Terminal of a PowerTransformer. The impedance values r, r0, x, and x0 of a PowerTransformerEnd represents a star equivalent as follows. 1) for a two Terminal PowerTransformer the high voltage (TransformerEnd.endNumber=1) PowerTransformerEnd has non zero values on r, r0, x, and x0 while the low voltage (TransformerEnd.endNumber=2) PowerTransformerEnd has zero values for r, r0, x, and x0. Parameters are always provided, even if the PowerTransformerEnds have the same rated voltage. In this case, the parameters are provided at the PowerTransformerEnd which has TransformerEnd.endNumber equal to 1. 2) for a three Terminal PowerTransformer the three PowerTransformerEnds represent a star equivalent with each leg in the star represented by r, r0, x, and x0 values. 3) For a three Terminal transformer each PowerTransformerEnd shall have g, g0, b and b0 values corresponding to the no load losses distributed on the three PowerTransformerEnds. The total no load loss shunt impedances may also be placed at one of the PowerTransformerEnds, preferably the end numbered 1, having the shunt values on end 1. This is the preferred way. 4) for a PowerTransformer with more than three Terminals the PowerTransformerEnd impedance values cannot be used. Instead use the TransformerMeshImpedance or split the transformer into multiple PowerTransformers. Each PowerTransformerEnd must be contained by a PowerTransformer. Because a PowerTransformerEnd (or any other object) can not be contained by more than one parent, a PowerTransformerEnd can not have an association to an EquipmentContainer (Substation, VoltageLevel, etc).
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CIM standard (perspective) |
IEC61970 (Grid) |
Slots
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The power transformer of this power transformer end. |
n/a |
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Magnetizing branch susceptance (B mag). The value can be positive or negative. |
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0..1 |
Kind of connection. |
n/a |
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0..1 |
Magnetizing branch conductance. |
n/a |
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Resistance (star-model) of the transformer end. The attribute shall be equal to or greater than zero for non-equivalent transformers. |
n/a |
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0..1 |
Normal apparent power rating. The attribute shall be a positive value. For a two-winding transformer the values for the high... |
n/a |
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1 |
Rated voltage: phase-phase for three-phase windings, and either phase-phase or phase-neutral for single-phase windings. A... |
n/a |
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Positive sequence series reactance (star-model) of the transformer end. |
n/a |
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Base voltage of the transformer end. This is essential for PU calculation. |
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0..1 |
Ratio tap changer associated with this transformer end. |
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1 |
Terminal of the power transformer to which this transformer end belongs. |
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1 |
Number for this transformer end, corresponding to the end's order in the power transformer vector group or phase angle clock... |
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0..1 |
The description is a free human readable text describing or naming the object. It may be non unique and may not correlate to... |
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0..1 |
The attribute is used for an exchange of the EIC code (Energy identification Code). The length of the string is 16... |
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Master resource identifier issued by a model authority. The mRID is unique within an exchange context. Global uniqueness is... |
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The name is any free human readable and possibly non unique text naming the object. |
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The attribute is used for an exchange of a human readable short name with length of the string 12 characters maximum. |
b
Magnetizing branch susceptance (B mag). The value can be positive or negative.
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BaseVoltage
Base voltage of the transformer end. This is essential for PU calculation.
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Cardinality |
1 |
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description
The description is a free human readable text describing or naming the object. It may be non unique and may not correlate to a naming hierarchy.
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Cardinality |
0..1 |
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Inherited from |
endNumber
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.
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Cardinality |
1 |
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energyIdentCodeEic
The attribute is used for an exchange of the EIC code (Energy identification Code). The length of the string is 16 characters as defined by the EIC code. For details on EIC scheme please refer to ENTSO-E web site.
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mRID
Master resource identifier issued by a model authority. The mRID is unique within an exchange context. Global uniqueness is easily achieved by using a UUID, as specified in RFC 4122, for the mRID. The use of UUID is strongly recommended. For CIMXML data files in RDF syntax conforming to IEC 61970-552, the mRID is mapped to rdf:ID or rdf:about attributes that identify CIM object elements.
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Cardinality |
1 |
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Inherited from |
name
The name is any free human readable and possibly non unique text naming the object.
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Cardinality |
1 |
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Inherited from |
PowerTransformer
The power transformer of this power transformer end.
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Cardinality |
1 |
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r
Resistance (star-model) of the transformer end. The attribute shall be equal to or greater than zero for non-equivalent transformers.
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Cardinality |
1 |
Type |
ratedS
Normal apparent power rating. The attribute shall be a positive value. For a two-winding transformer the values for the high and low voltage sides shall be identical.
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Cardinality |
0..1 |
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ratedU
Rated voltage: phase-phase for three-phase windings, and either phase-phase or phase-neutral for single-phase windings. A high voltage side, as given by TransformerEnd.endNumber, shall have a ratedU that is greater than or equal to ratedU for the lower voltage sides. The attribute shall be a positive value.
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Cardinality |
1 |
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RatioTapChanger
Ratio tap changer associated with this transformer end.
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Cardinality |
0..1 |
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Inherited from |
shortName
The attribute is used for an exchange of a human readable short name with length of the string 12 characters maximum.
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Cardinality |
0..1 |
Type |
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Inherited from |
Terminal
Terminal of the power transformer to which this transformer end belongs.
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Cardinality |
1 |
Type |
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Inherited from |