This component models a current transformer connected to an inductive burden (relay). The input to the model is the measured primary line current (in kA). The model calculates the secondary current from the CT winding (in Amps).
More: |
Finding Saturation Constants And Indices To Match Magnetising Characteristics Loss Characteristics (Lucas Model) PSCAD Reference [12] |
Name for Identification |
Text |
Optional text parameter for identification of the component. |
||
Primary Turns |
|
INTEGER |
Constant |
Enter the number of turns in the primary winding |
|
|
|
|
|
Secondary Turns |
|
INTEGER |
Constant |
Enter the number of turns in the secondary winding |
|
|
|
|
|
Secondary Resistance |
|
REAL |
Constant |
Enter the secondary winding resistance [W] |
|
|
|
|
|
Secondary Inductance |
|
REAL |
Constant |
Enter the leakage inductance of the CT referred to the secondary winding [H] |
|
|
|
|
|
Area |
|
REAL |
Constant |
Enter the mean core cross section [m2] |
|
|
|
|
|
Path Length |
|
REAL |
Constant |
Enter the mean path length of the core [m] |
|
|
|
|
|
Frequency |
|
REAL |
Constant |
Enter the rated frequency [Hz] |
|
|
|
|
|
Remnant Flux Density |
|
REAL |
Constant |
Enter the remnant flux density of the core at time zero [T] |
|
|
|
|
|
Initial Current in Core |
|
REAL |
Constant |
Enter the initial current in the magnetizing branch of the core at time zero (if any) [A] |
|
|
|
|
|
Magnetic Material |
|
Choice |
|
Select Custom or Silectron 53. If custom is selected, the core material data must be entered by the user |
Saturation CharacteristicsSaturation Characteristics
NOTE: These parameters are enabled only if Magnetic Material is selected as Custom.
Flux Density at Knee Point |
|
REAL |
Constant |
Flux density at the knee point of the B-H curve [T] |
|
|
|
|
|
Constant # |
|
REAL |
Constant |
Enter the corresponding constant Ki. See Finding Saturation Constants And Indices To Match Magnetising Characteristics for more details |
|
|
|
|
|
Index # |
|
INTEGER |
Constant |
Enter the corresponding index ai. See Finding Saturation Constants And Indices To Match Magnetising Characteristics for more details |
Loss CharacteristicsLoss Characteristics
NOTE: These parameters are enabled only if Magnetic Material is selected as Custom. See Loss Characteristics (Lucas Model) for a more complete description of loss coefficients.
Eddy Current Loss Coefficient |
|
REAL |
Constant |
Enter the eddy current loss coefficient Ged. |
|
|
|
|
|
Hysteresis Loss Coefficient # |
|
REAL |
Constant |
Enter the values for hysteresis loss coefficients Gi.
The default values are for the Silectron 53 material. If you have the B-H data for a different material and want to compute the coefficients and indices for saturation and hysteresis loss, please contact the PSCAD Support Desk (support@mhi.ca). There is no fixed method to find G-constants for hysteresis loss. |
Burden Resistance |
|
REAL |
Constant |
Enter the value of the burden (relay) resistance [W] |
|
|
|
|
|
Burden Inductance |
|
REAL |
Constant |
Enter the value of the burden (relay) inductance [H] |
Internal Output VariablesInternal Output Variables
Ideal CT Output Current |
|
REAL |
Output |
Secondary current if the CT was 'ideal' [A] |
|
|
|
|
|
Total Core Current |
|
REAL |
Output |
This is the sum of the core loss current and the magnetizing current [A] |
|
|
|
|
|
Magnetizing Current |
|
REAL |
Output |
Enter a name for the CT magnetizing current [A] |
|
|
|
|
|
Flux Density |
|
REAL |
Output |
Enter a name for the flux density of the core [T] |