master:ratio_changer_2w parametersPSCAD Zero Impedance Ideal Transformer

Every parameter of the PSCAD Zero Impedance Ideal Transformer (master:ratio_changer_2w): 3 names, with the unit, the default and the meaning PSCAD gives each one. Copy a name into parameters().

What master:ratio_changer_2w is

Zero Impedance Ideal Transformer (Ideal 2 Winding Ratio Changer (Transformer)), a component of PSCAD's Master Library, filed under transformers and reactors.

Definition
master:ratio_changer_2w
PSCAD name
Zero Impedance Ideal Transformer
Category
Transformers and reactors
Parameters
3, in 1 group
Read from
PSCAD 5.0.0, 2026-11-07

Read and write master:ratio_changer_2w in Python

import mhi.pscad

pscad = mhi.pscad.connect()              # the PSCAD that is open; launch() starts one
project = pscad.project("my_case")       # a case loaded in the workspace

for comp in project.find_all("master:ratio_changer_2w"):   # the exact definition, namespace first
    params = comp.parameters()           # every parameter, as PSCAD holds it
    print(str(params["TR"]))             # Scaling Factor

comp = project.find_all("master:ratio_changer_2w")[0]
comp.parameters(TR="2")                  # written as text
  • A parameter is named exactly as in the table, letter case included: parameters() gives every one of them in a dictionary, and a name the component does not have is refused.
  • A value that carries a unit comes back as a number whose unit is only in its text, so read it as text first (str(...)) or the unit is lost. PSCAD keeps a written unit as it is given: "2500 [mohm]" stays in mohm.
  • A Choice is read and written as its symbol (the capitals in "Written as"), not as the words PSCAD shows in the dialog.
  • find_all() takes the exact definition only. A wildcard or a bare name without master: comes back empty; the Builder's px_find walks the pages for those.

The Builder's runtime does the same with the unit handled for you: px_get(comp, "TR") and px_set(...), which also records the old value so the case is put back at the end. Getting started shows them.

Two-winding Transformer

ParameterUnitDefaultDescription
DimChoice·SINGLESingle or Three PhaseSelect Single phase or Three phaseWritten as SINGLE (Single phase), THREE (Three phase)
NameText··NameEnter a name for easy identificationRange 0 to 0
TRReal·1.0Scaling Factor

Related

← master:svc Static Var Compensator · master:Line_BusWork_1 1 Conductor Bus Bar →