master:itoc51 parametersPSCAD Inverse Time Over Current Relay
Every parameter of the PSCAD Inverse Time Over Current Relay (master:itoc51): 17 names, with the unit, the default and the meaning PSCAD gives each one. Copy a name into parameters().
What master:itoc51 is
Inverse Time Over Current Relay, a component of PSCAD's Master Library, filed under protection.
Definition
master:itoc51
PSCAD name
Inverse Time Over Current Relay
Category
Protection
Parameters
17, in 5 groups; 1 carry a unit
Read from
PSCAD 5.0.0, 2026-11-07
Read and write master:itoc51 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 workspacefor comp in project.find_all("master:itoc51"): # the exact definition, namespace first
params = comp.parameters() # every parameter, as PSCAD holds itprint(str(params["TR"])) # Reset Time (tr), in s
comp = project.find_all("master:itoc51")[0]
comp.parameters(TR="10.8 [s]") # a value that carries a unit is written with it
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.
Trip Characteristic Constant (B)Range 0.05 to 0.75
KReal
·
0.0
Trip Characteristic Constant (K)Range 0 to 0.75
PReal
·
0.02
Trip Characteristic Exponent (p)Range 0.01 to 2
QReal
·
2.0
Reset Exponent Constant (q)Range 0.01 to 2
TRReal
s
5.4
Reset Time (tr)Range 1 to 40
Automatic Data Entry_Company
Parameter
Unit
Default
Description
CHChoice
·
EXTREMELY_INVERSE
Type of CharacteristicsSelect the type of characteristics from moderately to extremely inverse choicesWritten as MODERATELY_INVERSE (Moderately inverse), INVERSE (Inverse), VERY_INVERSE (Very inverse), EXTREMELY_INVERSE (Extremely inverse)
TYPCChoice
·
USA
Type of Curve_CompanySelect from available choicesWritten as TYPE_CO (Type CO), TYPE_IAC (Type IAC), ALSTOM_MCGG (Alstom MCGG), USA (SEL (USA))
Automatic Data Entry_Standard
Parameter
Unit
Default
Description
CHSChoice
·
EXTREMELY_INVERSE
Type of CharacteristicsSelect the characteristics from 5 available choicesWritten as MODERATELY_INVERSE (Moderately inverse), STANDARD ((Standard) inverse), VERY_INVERSE (Very inverse), EXTREMELY_INVERSE (Extremely inverse), LONG_TIME_BACK_UP (Long time back_up)
TYPSChoice
·
IEEE_STDC37112
Type of Curve_StandardChoose IEEE or IEC standardWritten as IEEE_STDC37112 (IEEE Std.C37.112), IEC_STD_2553 (IEC Std 255-3)
Main
Parameter
Unit
Default
Description
DFChoice
·
EXPLICIT
Data Entry FormatSelect the data entry format from available choicesWritten as EXPLICIT (Explicit), AUTOMATIC_STANDARD (Automatic_Standard), AUTOMATIC_COMPANY (Automatic_Company)
IPICKReal
·
5.0
Pickup CurrentPickup current, use the same unit as in inputRange 1E-06 to 1000000
NameText
·
·
Name for IdentificationEnter a name for identification
RSChoice
·
NO
Resettable ?Select Yes or NoWritten as NO (No), YES (Yes)
TDReal
·
1.0
Time Dial SettingRange 0.01 to 100
Internal Output Variables
Parameter
Unit
Default
Description
intIPText
·
IntIP
Integrator InputEnter a name to monitor the input to the integrator
intOPText
·
IntOP
Integrator OutputEnter a name to monitor the output of the integrator