This component models two current transformers , operating in parallel in a differential protection scheme. The model is based on the Jiles-Atherton theory of ferromagnetic hysteresis. The effects of saturation, hysteresis remanence and minor loop formation are modeled based on the physics of the magnetic material.
The input to the model is the measured primary line currents (in kA). The model calculates the secondary currents from the CT winding (in Amps). The current through the relay is available as an internal output.
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Name for Identification |
Text |
Optional text parameter for identification of the component. |
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Primary Turns |
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INTEGER |
Constant |
Enter the number of primary turns |
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Secondary Turns |
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INTEGER |
Constant |
Enter the number of secondary turns |
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Secondary Resistance |
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REAL |
Constant |
Enter the secondary winding resistance [W] |
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Secondary Inductance |
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REAL |
Constant |
Enter the leakage inductance of the CT referred to the secondary winding [H] |
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Area |
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REAL |
Constant |
Enter the mean core cross section [m2] |
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Path Length |
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REAL |
Constant |
Enter the mean path length of the core [m] |
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Remnant Flux Density |
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REAL |
Constant |
Enter the remnant flux density of the core [T] |
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Initial Current in Core |
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REAL |
Constant |
Enter the initial current in the core (if any) [A] |
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Magnetic Material |
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Choice |
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Select Custom Material or Material 1. If custom material is selected, the core material data must be entered by the user |
Magnetization Cha. of the Material CT#Magnetization Cha. of the Material CT#
NOTE: These parameters are enabled only if Magnetic Material is selected as Custom Material. The method of determining the data required in this section is outlined in PSCAD References [13], [14], [15], [16] and [17]. If you have the B-H data for a new material and have difficulty in determining the data that is to be entered here, please contact the Support Desk (support@mhi.ca).
Domain Flexing Parameter |
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REAL |
Constant |
Enter the domain flexing parameter |
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Domain Pinning Parameter |
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REAL |
Constant |
Enter the domain pinning parameter [T] |
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Parameter to Adjust K with M |
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REAL |
Constant |
Enter the parameter to adjust K with M
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Inter-Domain Coupling |
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REAL |
Constant |
Enter the inter-domain coupling |
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Sat. Anhysteretic Magnetization |
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REAL |
Constant |
Enter the value for anhysteretic saturation [A/m] |
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Coefficient # of Anhys. Curve |
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REAL |
Constant |
Enter the values of the curve parameters. The anhysteretic curve is represented by the function derived by McLaren and Annakkage as shown in [15]. |
Burden Resistance |
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REAL |
Constant |
Enter the value of the burden (relay) resistance [W] |
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Burden Inductance |
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REAL |
Constant |
Enter the value of the burden (relay) inductance [H] |
Internal Outputs CT#Internal Outputs CT#
Magnetomotive Force |
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REAL |
Output |
Enter a name for the magnetomotive force (H) of the core [Aturns/m] |
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Flux Density |
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REAL |
Output |
Enter a name for the flux density (B) of the core [T] |
Internal OutputsInternal Outputs
Burden Voltage |
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REAL |
Output |
Specify a name for the burden (relay) voltage [V] |
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Burden Current |
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REAL |
Output |
Specify a name for the burden (relay) current [A] |