master:multimass2 parametersPSCAD Torsional Shaft Model
Every parameter of the PSCAD Torsional Shaft Model (master:multimass2): 211 names, with the unit, the default and the meaning PSCAD gives each one. Copy a name into parameters().
What master:multimass2 is
Torsional Shaft Model, a component of PSCAD's Master Library, filed under control blocks.
- Definition
master:multimass2- PSCAD name
- Torsional Shaft Model
- Category
- Control blocks
- Parameters
- 211, in 11 groups; 30 carry a unit
- Read from
- PSCAD 5.0.0, 2026-11-07
Read and write master:multimass2 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:multimass2"): # the exact definition, namespace first
params = comp.parameters() # every parameter, as PSCAD holds it
print(str(params["F"])) # Electrical Base Frequency, in Hz
comp = project.find_all("master:multimass2")[0]
comp.parameters(F="120 [Hz]") # 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 withoutmaster:comes back empty; the Builder'spx_findwalks the pages for those.
The Builder's runtime does the same with the unit handled for you: px_get(comp, "F") and px_set(...), which also records the old value so the case is put back at the end. Getting started shows them.
- Configuration10
- Inertia Constants25
- Shaft Spring Constants24
- Mutual Damping24
- Internal Output Variable Names - 225
- Self Damping25
- Internal Output Variable Names - 124
- Torque Shares25
- Internal Output Variable Names - 326
- Uniform Modal Damping1
- Initialization Data Interface2
Configuration
| Parameter | Unit | Default | Description |
|---|---|---|---|
EnabInteger | · | 1 | Initialization switch: 0-Init;1-ReleaseRange 0 to 1 |
FReal | Hz | 60.0 | Electrical Base FrequencyEnter the electrical base frequencyAt least 1E-307 |
GenIDInteger | · | 5 | Generator Mass NumberRange 1 to 25 |
MVAReal | MVA | 892.4 | Machine Total MVAEnter the MVA rating of the machineAt least 1E-307 |
NInteger | · | 4 | Number of MassesEnter the number of masses (including the machine and exciter) in the multimass systemRange 1 to 25 |
NameText | · | · | Name for IdentificationEnter a name for identification |
RPMReal | rev/min | 3600.0 | Machine Mechanical Synchronous SpeedEnter the mechanical synchronous speed of massesAt least 1E-307 |
SQCChoice | · | SYNCHRONOUS_MACHINE | For Use With ...Select the type of machine this component is connectedWritten as SYNCHRONOUS_MACHINE (Synchronous Machine), INDUCTION_MACHINE (Induction Machine), DC_MACHINE (DC Machine), PM_MACHINE (PM Machine) |
UnitsChoice | · | S_KPU_DPU | Unit System Number (see help)Choose the appropriate unit system usedWritten as LBFTFT_KLBFT_RAD (1 : H(lb.ft.ft.) K(lb.ft/rad)), INLBFS_2_KLBFIN_RAD (2 : H(in.lbf.s^2) K(lbf.in/rad)), LBININ_KLBFIN_RAD (3 : H(lb.in.in.) K(lbf.in/rad)), S_KPU (4 : H(s) K(pu)), KGM_2_KNM_RAD (5 : H(kg.m^2) K(N.m/rad)), LBFT_2_KLBFT_RAD_DLBFFTS_RAD (6 : H(lb.ft^2) K(lb.ft/rad) D(lbf.ft.s/rad)), INLBFS_2_KLBFIN_RAD_DLBFINS_RAD (7 : H(in.lbf.s^2) K(lbf.in/rad) D(lbf.in.s/rad)), LBIN_2_KLBFIN_RAD_DLBFINS_RAD (8 : H(lb.in^2) K(lbf.in/rad) D(lbf.in.s/rad)), S_KPU_DPU (9 : H(s) K(pu) D(pu)), KGM_2_KNM_RAD_DNMS_RAD (10 : H(kg.m^2) K(N.m/rad) D(N.m.s/rad)) |
spdiniReal | pu | 1 | Machine Initial Electrical SpeedEnter the initial electrical speedRange 0 to 2 |
Inertia Constants
| Parameter | Unit | Default | Description |
|---|---|---|---|
H1Real | · | 0.0929 | Mass #1 Inertia ConstantAt least 0 |
H10Real | · | 0.0 | Mass #10 Inertia ConstantAt least 0 |
H11Real | · | 0.0 | Mass #11 Inertia ConstantAt least 0 |
H12Real | · | 0.0 | Mass #12 Inertia ConstantAt least 0 |
H13Real | · | 0.0 | Mass #13 Inertia ConstantAt least 0 |
H14Real | · | 0.0 | Mass #14 Inertia ConstantAt least 0 |
H15Real | · | 0.0 | Mass #15 Inertia ConstantAt least 0 |
H16Real | · | 0.0 | Mass #16 Inertia ConstantAt least 0 |
H17Real | · | 0.0 | Mass #17 Inertia ConstantAt least 0 |
H18Real | · | 0.0 | Mass #18 Inertia ConstantAt least 0 |
H19Real | · | 0.0 | Mass #19 Inertia ConstantAt least 0 |
H2Real | · | 0.1556 | Mass #2 Inertia ConstantAt least 0Used when (N>=2) |
H20Real | · | 0.0 | Mass #20 Inertia ConstantAt least 0 |
H21Real | · | 0.0 | Mass #21 Inertia ConstantAt least 0 |
H22Real | · | 0.0 | Mass #22 Inertia ConstantAt least 0 |
H23Real | · | 0.0 | Mass #23 Inertia ConstantAt least 0 |
H24Real | · | 0.0 | Mass #24 Inertia ConstantAt least 0 |
H25Real | · | 0.0 | Mass #25 Inertia ConstantAt least 0 |
H3Real | · | 0.8587 | Mass #3 Inertia ConstantAt least 0Used when (N>=3) |
H4Real | · | 0.8842 | Mass #4 Inertia ConstantAt least 0Used when (N>=4) |
H5Real | · | 0.8685 | Mass #5 Inertia ConstantAt least 0Used when (N>=5) |
H6Real | · | 0.0342 | Mass #6 Inertia ConstantAt least 0Used when (N>=6) |
H7Real | · | 0.0 | Mass #7 Inertia ConstantAt least 0Used when (N>=7) |
H8Real | · | 0.0 | Mass #8 Inertia ConstantAt least 0Used when (N>=8) |
H9Real | · | 0.0 | Mass #9 Inertia ConstantAt least 0 |
Shaft Spring Constants
| Parameter | Unit | Default | Description |
|---|---|---|---|
K10_Real | · | 0.0 | Spring Constant From Mass #10 to #11At least 0 |
K11_Real | · | 0.0 | Spring Constant From Mass #11 to #12At least 0 |
K12Real | · | 7277.0 | Spring Constant From Mass #1 to #2At least 0Used when (N>=2) |
K12_Real | · | 0.0 | Spring Constant From Mass #12 to #13At least 0 |
K13_Real | · | 0.0 | Spring Constant From Mass #13 to #14At least 0 |
K14_Real | · | 0.0 | Spring Constant From Mass #14 to #15At least 0 |
K15_Real | · | 0.0 | Spring Constant From Mass #15 to #16At least 0 |
K16_Real | · | 0.0 | Spring Constant From Mass #16 to #17At least 0 |
K17_Real | · | 0.0 | Spring Constant From Mass #17 to #18At least 0 |
K18_Real | · | 0.0 | Spring Constant From Mass #18 to #19At least 0 |
K19_Real | · | 0.0 | Spring Constant From Mass #19 to #20At least 0 |
K20_Real | · | 0.0 | Spring Constant From Mass #20 to #21At least 0 |
K21_Real | · | 0.0 | Spring Constant From Mass #21 to #22At least 0 |
K22_Real | · | 0.0 | Spring Constant From Mass #22 to #23At least 0 |
K23Real | · | 13168.0 | Spring Constant From Mass #2 to #3At least 0 |
K23_Real | · | 0.0 | Spring Constant From Mass #23 to #24At least 0 |
K24_Real | · | 0.0 | Spring Constant From Mass #24 to #25At least 0 |
K34Real | · | 19618.0 | Spring Constant From Mass #3 to #4At least 0 |
K45Real | · | 26713.0 | Spring Constant From Mass #4 to #5At least 0 |
K5_Real | · | 1064.0 | Spring Constant From Mass #5 to #6At least 0 |
K6_Real | · | 0.0 | Spring Constant From Mass #6 to #7At least 0 |
K7_Real | · | 0.0 | Spring Constant From Mass #7 to #8At least 0 |
K8_Real | · | 0.0 | Spring Constant From Mass #8 to #9At least 0 |
K9_Real | · | 0.0 | Spring Constant From Mass #9 to #10At least 0 |
Mutual Damping
| Parameter | Unit | Default | Description |
|---|---|---|---|
MD10_Real | · | 0.0 | Damping Between Mass #10 and #11At least 0 |
MD11_Real | · | 0.0 | Damping Between Mass #11 and #12At least 0 |
MD12Real | · | 0.0 | Damping Between Mass #1 and #2At least 0Used when (N>=2) |
MD12_Real | · | 0.0 | Damping Between Mass #12 and #13At least 0 |
MD13_Real | · | 0.0 | Damping Between Mass #13 and #14At least 0 |
MD14_Real | · | 0.0 | Damping Between Mass #14 and #15At least 0 |
MD15_Real | · | 0.0 | Damping Between Mass #15 and #16At least 0 |
MD16_Real | · | 0.0 | Damping Between Mass #16 and #17At least 0 |
MD17_Real | · | 0.0 | Damping Between Mass #17 and #18At least 0 |
MD18_Real | · | 0.0 | Damping Between Mass #18 and #19At least 0 |
MD19_Real | · | 0.0 | Damping Between Mass #19 and #20At least 0 |
MD20_Real | · | 0.0 | Damping Between Mass #20 and #21At least 0 |
MD21_Real | · | 0.0 | Damping Between Mass #21 and #22At least 0 |
MD22_Real | · | 0.0 | Damping Between Mass #22 and #23At least 0 |
MD23Real | · | 0.0 | Damping Between Mass #2 and #3At least 0 |
MD23_Real | · | 0.0 | Damping Between Mass #23 and #24At least 0 |
MD24_Real | · | 0.0 | Damping Between Mass #24 and #25At least 0 |
MD34Real | · | 0.0 | Damping Between Mass #3 and #4At least 0 |
MD45Real | · | 0.0 | Damping Between Mass #4 and #5At least 0 |
MD5_Real | · | 0.0 | Damping Between Mass #5 and #6At least 0 |
MD6_Real | · | 0.0 | Damping Between Mass #6 and #7At least 0 |
MD7_Real | · | 0.0 | Damping Between Mass #7 and #8At least 0 |
MD8_Real | · | 0.0 | Damping Between Mass #8 and #9At least 0 |
MD9_Real | · | 0.0 | Damping Between Mass #9 and #10At least 0 |
Internal Output Variable Names - 2
| Parameter | Unit | Default | Description |
|---|---|---|---|
P1Text | · | · | Mechanical Position of Mass 1 relative to Generator |
P10Text | · | · | Mechanical Position of Mass 10 relative to Generator |
P11Text | · | · | Mechanical Position of Mass 11 relative to Generator |
P12Text | · | · | Mechanical Position of Mass 12 relative to Generator |
P13Text | · | · | Mechanical Position of Mass 13 relative to Generator |
P14Text | · | · | Mechanical Position of Mass 14 relative to Generator |
P15Text | · | · | Mechanical Position of Mass 15 relative to Generator |
P16Text | · | · | Mechanical Position of Mass 16 relative to Generator |
P17Text | · | · | Mechanical Position of Mass 17 relative to Generator |
P18Text | · | · | Mechanical Position of Mass 18 relative to Generator |
P19Text | · | · | Mechanical Position of Mass 19 relative to Generator |
P2Text | · | · | Mechanical Position of Mass 2 relative to Generator |
P20Text | · | · | Mechanical Position of Mass 20 relative to Generator |
P21Text | · | · | Mechanical Position of Mass 21 relative to Generator |
P22Text | · | · | Mechanical Position of Mass 22 relative to Generator |
P23Text | · | · | Mechanical Position of Mass 23 relative to Generator |
P24Text | · | · | Mechanical Position of Mass 24 relative to Generator |
P25Text | · | · | Mechanical Position of Mass 25 relative to Generator |
P3Text | · | · | Mechanical Position of Mass 3 relative to Generator |
P4Text | · | · | Mechanical Position of Mass 4 relative to Generator |
P5Text | · | · | Mechanical Position of Mass 5 relative to Generator |
P6Text | · | · | Mechanical Position of Mass 6 relative to Generator |
P7Text | · | · | Mechanical Position of Mass 7 relative to Generator |
P8Text | · | · | Mechanical Position of Mass 8 relative to Generator |
P9Text | · | · | Mechanical Position of Mass 9 relative to Generator |
Self Damping
| Parameter | Unit | Default | Description |
|---|---|---|---|
SD1Real | · | 0.0 | Mass #1 Self DampingAt least 0 |
SD10Real | · | 0.0 | Mass #10 Self DampingAt least 0 |
SD11Real | · | 0.0 | Mass #11 Self DampingAt least 0 |
SD12Real | · | 0.0 | Mass #12 Self DampingAt least 0 |
SD13Real | · | 0.0 | Mass #13 Self DampingAt least 0 |
SD14Real | · | 0.0 | Mass #14 Self DampingAt least 0 |
SD15Real | · | 0.0 | Mass #15 Self DampingAt least 0 |
SD16Real | · | 0.0 | Mass #16 Self DampingAt least 0 |
SD17Real | · | 0.0 | Mass #17 Self DampingAt least 0 |
SD18Real | · | 0.0 | Mass #18 Self DampingAt least 0 |
SD19Real | · | 0.0 | Mass #19 Self DampingAt least 0 |
SD2Real | · | 0.0 | Mass #2 Self DampingAt least 0 |
SD20Real | · | 0.0 | Mass #20 Self DampingAt least 0 |
SD21Real | · | 0.0 | Mass #21 Self DampingAt least 0 |
SD22Real | · | 0.0 | Mass #22 Self DampingAt least 0 |
SD23Real | · | 0.0 | Mass #23 Self DampingAt least 0 |
SD24Real | · | 0.0 | Mass #24 Self DampingAt least 0 |
SD25Real | · | 0.0 | Mass #25 Self DampingAt least 0 |
SD3Real | · | 0.0 | Mass #3 Self DampingAt least 0 |
SD4Real | · | 0.0 | Mass #4 Self DampingAt least 0 |
SD5Real | · | 0.0 | Mass #5 Self DampingAt least 0 |
SD6Real | · | 0.0 | Mass #6 Self DampingAt least 0 |
SD7Real | · | 0.0 | Mass #7 Self DampingAt least 0 |
SD8Real | · | 0.0 | Mass #8 Self DampingAt least 0 |
SD9Real | · | 0.0 | Mass #9 Self DampingAt least 0 |
Internal Output Variable Names - 1
| Parameter | Unit | Default | Description |
|---|---|---|---|
T10_Text | · | · | Torque on Shaft from Mass 10 - 11 |
T11_Text | · | · | Torque on Shaft from Mass 11 - 12 |
T12Text | · | · | Torque on Shaft from Mass 1 - 2Used when N>1 |
T12_Text | · | · | Torque on Shaft from Mass 12 - 13 |
T13_Text | · | · | Torque on Shaft from Mass 13 - 14 |
T14_Text | · | · | Torque on Shaft from Mass 14 - 15 |
T15_Text | · | · | Torque on Shaft from Mass 15 - 16 |
T16_Text | · | · | Torque on Shaft from Mass 16 - 17 |
T17_Text | · | · | Torque on Shaft from Mass 17 - 18 |
T18_Text | · | · | Torque on Shaft from Mass 18 - 19 |
T19_Text | · | · | Torque on Shaft from Mass 19 - 20 |
T20_Text | · | · | Torque on Shaft from Mass 20 - 21 |
T21_Text | · | · | Torque on Shaft from Mass 21 - 22 |
T22_Text | · | · | Torque on Shaft from Mass 22 - 23 |
T23Text | · | · | Torque on Shaft from Mass 2 - 3 |
T23_Text | · | · | Torque on Shaft from Mass 23 - 24 |
T24_Text | · | · | Torque on Shaft from Mass 24 - 25 |
T34Text | · | · | Torque on Shaft from Mass 3 - 4 |
T45Text | · | · | Torque on Shaft from Mass 4 - 5 |
T56Text | · | · | Torque on Shaft from Mass 5 - 6 |
T6_Text | · | · | Torque on Shaft from Mass 6 - 7 |
T7_Text | · | · | Torque on Shaft from Mass 7 - 8 |
T8_Text | · | · | Torque on Shaft from Mass 8 - 9 |
T9_Text | · | · | Torque on Shaft from Mass 9 - 10 |
Torque Shares
| Parameter | Unit | Default | Description |
|---|---|---|---|
TF1Real | pu | 0.30 | Torque Share for Mass #1Range 0 to 1Used when (N>1) |
TF10Real | pu | 0.0 | Torque Share for Mass #10Range 0 to 1 |
TF11Real | pu | 0.0 | Torque Share for Mass #11Range 0 to 1 |
TF12Real | pu | 0.0 | Torque Share for Mass #12Range 0 to 1 |
TF13Real | pu | 0.0 | Torque Share for Mass #13Range 0 to 1 |
TF14Real | pu | 0.0 | Torque Share for Mass #14Range 0 to 1 |
TF15Real | pu | 0.0 | Torque Share for Mass #15Range 0 to 1 |
TF16Real | pu | 0.0 | Torque Share for Mass #16Range 0 to 1 |
TF17Real | pu | 0.0 | Torque Share for Mass #17Range 0 to 1 |
TF18Real | pu | 0.0 | Torque Share for Mass #18Range 0 to 1 |
TF19Real | pu | 0.0 | Torque Share for Mass #19Range 0 to 1 |
TF2Real | pu | 0.26 | Torque Share for Mass #2Range 0 to 1 |
TF20Real | pu | 0.0 | Torque Share for Mass #20Range 0 to 1 |
TF21Real | pu | 0.0 | Torque Share for Mass #21Range 0 to 1 |
TF22Real | pu | 0.0 | Torque Share for Mass #22Range 0 to 1 |
TF23Real | pu | 0.0 | Torque Share for Mass #23Range 0 to 1 |
TF24Real | pu | 0.0 | Torque Share for Mass #24Range 0 to 1 |
TF25Real | pu | 0.0 | Torque Share for Mass #25Range 0 to 1 |
TF3Real | pu | 0.22 | Torque Share for Mass #3Range 0 to 1 |
TF4Real | pu | 0.22 | Torque Share for Mass #4Range 0 to 1 |
TF5Real | pu | 0.0 | Torque Share for Mass #5Range 0 to 1 |
TF6Real | pu | 0.0 | Torque Share for Mass #6Range 0 to 1 |
TF7Real | pu | 0.0 | Torque Share for Mass #7Range 0 to 1 |
TF8Real | pu | 0.0 | Torque Share for Mass #8Range 0 to 1 |
TF9Real | pu | 0.0 | Torque Share for Mass #9Range 0 to 1 |
Internal Output Variable Names - 3
| Parameter | Unit | Default | Description |
|---|---|---|---|
W1Text | · | · | Delta Mechanical Speed of Mass 1 |
W10Text | · | · | Delta Mechanical Speed of Mass 10 |
W11Text | · | · | Delta Mechanical Speed of Mass 11 |
W12Text | · | · | Delta Mechanical Speed of Mass 12 |
W13Text | · | · | Delta Mechanical Speed of Mass 13 |
W14Text | · | · | Delta Mechanical Speed of Mass 14 |
W15Text | · | · | Delta Mechanical Speed of Mass 15 |
W16Text | · | · | Delta Mechanical Speed of Mass 16 |
W17Text | · | · | Delta Mechanical Speed of Mass 17 |
W18Text | · | · | Delta Mechanical Speed of Mass 18 |
W19Text | · | · | Delta Mechanical Speed of Mass 19 |
W2Text | · | · | Delta Mechanical Speed of Mass 2 |
W20Text | · | · | Delta Mechanical Speed of Mass 20 |
W21Text | · | · | Delta Mechanical Speed of Mass 21 |
W22Text | · | · | Delta Mechanical Speed of Mass 22 |
W23Text | · | · | Delta Mechanical Speed of Mass 23 |
W24Text | · | · | Delta Mechanical Speed of Mass 24 |
W25Text | · | · | Delta Mechanical Speed of Mass 25 |
W3Text | · | · | Delta Mechanical Speed of Mass 3 |
W4Text | · | · | Delta Mechanical Speed of Mass 4 |
W5Text | · | · | Delta Mechanical Speed of Mass 5 |
W6Text | · | · | Delta Mechanical Speed of Mass 6 |
W7Text | · | · | Delta Mechanical Speed of Mass 7 |
W8Text | · | · | Delta Mechanical Speed of Mass 8 |
W9Text | · | · | Delta Mechanical Speed of Mass 9 |
WbasText | · | · | Rated Mechanical Speed of the System |
Uniform Modal Damping
| Parameter | Unit | Default | Description |
|---|---|---|---|
sigmaReal | 1/s | 0.0 | Modal Damping for All ModesAt least 0Used when (Units<=5) |
Initialization Data Interface
| Parameter | Unit | Default | Description |
|---|---|---|---|
teiChoice | · | NO | Input Initialized Steady Electrical TorqueSelect Yes or NoWritten as NO (No), YES (Yes) |
tmiChoice | · | NO | Output Initialized Mechanical TorqueSelect Yes or NoWritten as NO (No), YES (Yes) |
Related
← master:multimass Torsional Shaft Model · master:trig Trignometric Functions →