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.
“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.
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
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!