master:detect_change parametersPSCAD Change Detector

Every parameter of the PSCAD Change Detector (master:detect_change): 4 names, with the unit, the default and the meaning PSCAD gives each one. Copy a name into parameters().

What master:detect_change is

Change Detector, a component of PSCAD's Master Library, filed under control blocks.

Definition
master:detect_change
PSCAD name
Change Detector
Category
Control blocks
Parameters
4, in 1 group
Read from
PSCAD 5.0.0, 2026-11-07

Read and write master:detect_change 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:detect_change"):   # the exact definition, namespace first
    params = comp.parameters()           # every parameter, as PSCAD holds it
    print(str(params["Dim"]))            # Dimension

comp = project.find_all("master:detect_change")[0]
comp.parameters(Dim="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, "Dim") and px_set(...), which also records the old value so the case is put back at the end. Getting started shows them.

Configuration

ParameterUnitDefaultDescription
DimInteger·1DimensionDimension of input/output signalsRange 1 to 2147483647
NameText··NameOptional name for easy identificationRange 0 to 0
RtolReal·1e-20ToleranceAllowed tolerance for real and complex numbers. For complex numbers this is the tolerance for real and imagniary portions of the number, not the absolute magnitudeAt least 1E-308Used when input!=1
inputChoice·INTEGERInput Data TypeSelect Integer, Real or ComplexWritten as INTEGER (Integer), REAL (Real), COMPLEX (Complex)

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