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(transformer3w-model)=

Three Winding Transformer

Model of a three winding transformer. It is assumed, that node A is the node with highest, node B with intermediate and node C with lowest voltage.

The assumed mathematical model is inspired by ABB Schaltanlagenhanbuch 1, but with the addition of a central phase-to-ground admittance, cf. following picture.

---
align: center
name: Equivalent circuit diagram of a three winding transformer
---
"Star like" T-equivalent circuit diagram of a three winding transformer

Attributes, Units and Remarks

Type Model

All impedances and admittances are given with respect to the higher voltage side.

.. list-table::
   :widths: 33 33 33
   :header-rows: 0


   * - Attribute
     - Unit
     - Remarks

   * - uuid
     -
     -

   * - id
     -
     - Human readable identifier

   * - rScA
     - Ω
     - Short circuit resistance in branch A

   * - rScB
     - Ω
     - Short circuit resistance in branch B

   * - rScC
     - Ω
     - Short circuit resistance in branch C

   * - xScA
     - Ω
     - Short circuit reactance in branch A

   * - xScB
     - Ω
     - Short circuit reactance in branch B

   * - xScC
     - Ω
     - Short circuit reactance in branch C

   * - gM
     - nS
     - No load conductance

   * - bM
     - nS
     - No load susceptance

   * - sRatedA
     - kVA
     - Rated apparent power of branch A

   * - sRatedB
     - kVA
     - Rated apparent power of branch B

   * - sRatedC
     - kVA
     - Rated apparent power of branch C

   * - vRatedA
     - kV
     - Rated voltage at higher node A

   * - vRatedB
     - kV
     - Rated voltage at higher node B

   * - vRatedC
     - kV
     - Rated voltage at higher node C

   * - dV
     - %
     - Voltage magnitude increase per tap position

   * - dPhi
     - °
     - Voltage angle increase per tap position

   * - tapNeutr
     -
     - Neutral tap position

   * - tapMin
     -
     - Minimum tap position

   * - tapMax
     -
     - Maximum tap position

Entity Model

.. list-table::
   :widths: 33 33 33
   :header-rows: 0


   * - Attribute
     - Unit
     - Remarks

   * - uuid
     - --
     -

   * - id
     - --
     - Human readable identifier

   * - operator
     - --
     -

   * - operationTime
     - --
     - Timely restriction of operation

   * - nodeA
     - --
     - Higher voltage node

   * - nodeB
     - --
     - Intermediate voltage node

   * - nodeC
     - --
     - Lowest voltage node

   * - parallelDevices
     - --
     - | overall amount of parallel transformers to automatically
       | construct (e.g. parallelDevices = 2 will build a
       | total of two transformers using the specified parameters)

   * - type
     - --
     -

   * - tapPos
     - --
     - Current position of the tap changer

   * - autoTap
     - --
     - true, if there is a tap regulation apparent and active

Caveats

Nothing - at least not known. If you found something, please contact us!

Footnotes

  1. Gremmel, H., Ed., Schaltanlagen. Cornelsen Verlag, 1999, Vol. 10, isbn: 3-464-48235-9. ↩