: Public Class
Created: 18/07/2009 07:30:59
Modified: 23/02/2012 16:58:13
Project:
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An electrical device consisting of  two or more coupled windings, with or without a magnetic core, for introducing mutual coupling between electric circuits. Transformers can be used to control voltage and phase shift (active power flow).<br/>A power transformer may be composed of separate transformer tanks that need not be identical.<br/>A power transformer can be modeled with or without tanks and is intended for use in both balanced and unbalanced representations.   A power transformer typically has two terminals, but may have one (grounding), three or more terminals.<br/>The inherited association ConductingEquipment.BaseVoltage should not be used.  The association from TransformerEnd to BaseVoltage should be used instead.<br/>
Attribute
Public CurrentFlow
  beforeShCircuitHighestOperatingCurrent
Details:
Notes: The highest operating current (Ib in the IEC 60909-0) before short circuit (depends on network configuration and relevant reliability philosophy). It is used for calculation of the impedance correction factor KT defined in IEC 60909-0.<br/>
Public Voltage
  beforeShCircuitHighestOperatingVoltage
Details:
Notes: The highest operating voltage (Ub in the IEC 60909-0) before short circuit. It is used for calculation of the impedance correction factor KT defined in IEC 60909-0. This is worst case voltage on the low side winding (Section 3.7.1 in the standard). Used to define operating conditions.<br/>
Public AngleDegrees
  beforeShortCircuitAnglePf
Details:
Notes: The angle of power factor before short circuit (phib in the IEC 60909-0). It is used for calculation of the impedance correction factor KT defined in IEC 60909-0. This is the worst case power factor. Used to define operating conditions.<br/>
Public Voltage
  highSideMinOperatingU
Details:
Notes: The minimum operating voltage (uQmin in the IEC 60909-0) at the high voltage side (Q side) of the unit transformer of the power station unit. A value well established from long-term operating experience of the system. It is used for calculation of the impedance correction factor KG defined in IEC 60909-0<br/>
Public Boolean
  isPartOfGeneratorUnit
Details:
Notes: Indicates whether the machine is part of a power station unit. Used for short circuit data exchange according to IEC 60909<br/>
Public Boolean
  operationalValuesConsidered
Details:
Notes: It is used to define if the data (other attributes related to short circuit data exchange) defines long term operational conditions or not. Used for short circuit data exchange according to IEC 60909.<br/>
Public String
  vectorGroup
Details:
Notes: Vector group of the transformer for protective relaying, e.g., Dyn1. For unbalanced transformers, this may not be simply determined from the constituent winding connections and phase angle dispacements.<br/><br/>The vectorGroup string consists of the following components in the order listed: high voltage winding connection, mid voltage winding connection (for three winding transformers), phase displacement clock number from 0 to 11,  low voltage winding connection <br/>phase displacement clock number from 0 to 11.   The winding connections are D (delta), Y (wye), YN (wye with neutral), Z (zigzag), ZN (zigzag with neutral), A (auto transformer). Upper case means the high voltage, lower case mid or low. The high voltage winding always has clock postion 0 and is not included in the vector group string.  Some examples: YNy0 (two winding wye to wye with no phase displacement), YNd11 (two winding wye to delta with 330 degrees phase displacement), YNyn0d5 (three winding transformer wye with neutral high voltgage, wye with neutral mid voltgage and no phase displacement, delta low voltage with 150 degrees displacement).<br/><br/>Phase displacement is defined as the angular difference between the phasors representing the voltages between the neutral point (real or imaginary) and the corresponding terminals of two windings, a positive sequence voltage system being applied to the high-voltage terminals, following each other in alphabetical sequence if they are lettered, or in numerical sequence if they are numbered: the phasors are assumed to rotate in a counter-clockwise sense.<br/><br/>
Element Source Role Target Role
PowerTransformerEnd
Class  
Name: PowerTransformer
The power transformer of this power transformer end.
Name: PowerTransformerEnd
The ends of this power transformer.
Details:
 
Element Source Role Target Role
TransformerTank
Class  
Name: TransformerTanks
All transformers that belong to this bank.
Name: PowerTransformer
Bank this transformer belongs to.
Details:
 
Object Type Connection Direction Notes
TransformerTank Class Weak From  
PowerTransformer Class Dependency From  
MktPowerTransformer Class Generalization From  
ConductingEquipment Class Generalization To