This component models a coactively coupled voltage transformer. The input to the model is the voltage across the capacitors, VP (measured from the system in kV) C1 and C2. The output is the transformed voltage VS (in Volts).
The schematic of the CCVT circuit model is shown below:
NOTE: In terms
of the CCVT model, the K
and a
values referred in Finding Saturation
Constants And Indices To Match Magnetising Characteristics, should
define the relationship between i
and B, not H
and B.
The values i and H
are related by the following equation (where N
is the number of turns and 
is
the length of the core):
More: |
Finding Saturation Constants And Indices To Match Magnetising Characteristics (See Note below) PSCAD Reference [12] |
Name for Identification |
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Capacitor 1 |
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REAL |
Constant |
Enter the value of capacitance (C1) [pF] |
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Capacitor 2 |
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REAL |
Constant |
Enter the value of capacitance (C2) [pF] |
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Compensating Inductance |
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REAL |
Constant |
Enter the value of the compensating inductance (Lcomp) [H] |
VT Data - GeneralVT Data - General
NOTE: Refer to the above diagram when selecting these parameters.
VT Ratio |
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REAL |
Constant |
Enter the voltage transformer turns ratio |
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Primary Inductance (Referred to Sec.) |
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REAL |
Constant |
Enter the value of primary leakage inductance referred to the secondary (LP) [H] |
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Primary Resistance (Referred to Sec.) |
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REAL |
Constant |
Enter the value of primary resistance referred to the secondary (RP) [W] |
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Secondary Inductance |
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REAL |
Constant |
Enter the value of secondary leakage inductance (LS) [H] |
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Secondary Resistance |
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REAL |
Constant |
Enter the value of secondary resistance (RP) [W] |
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Eddy Current Loss @ Normal Conditions |
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REAL |
Constant |
Enter the eddy current loss under nominal operation [W] |
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Secondary Operating voltage |
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REAL |
Constant |
Rated voltage of the voltage transformer secondary [V] |
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Operating Flux Density |
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REAL |
Constant |
Core rated flux density [T] |
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Hysteresis Loss @ Normal Conditions |
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REAL |
Constant |
Hysteresis loss under nominal operation [W] |
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Initial Remnance |
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REAL |
Constant |
Remnance flux of the core [pu] |
VT Data - SaturationVT Data - Saturation
Index # |
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INTEGER |
Constant |
Enter the corresponding index. See Finding Saturation Constants And Indices To Match Magnetising Characteristics for more details |
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Coefficient # |
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REAL |
Constant |
Enter the corresponding coefficient. See Finding Saturation Constants And Indices To Match Magnetising Characteristics for more details |
NOTE: Refer to the above diagram when selecting these parameters.
Burden Resistance - Series |
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REAL |
Constant |
Enter the value of the series burden resistance (Rbur) [W] |
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Burden Inductance - Series |
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REAL |
Constant |
Enter the value of the series burden inductance (Lbur) [H] |
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Burden Resistance - Parallel |
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REAL |
Constant |
Enter the value of the parallel burden resistance (RPbur) [W] |
Ferro-Resonance FilterFerro-Resonance Filter
NOTE: Refer to the above diagram when selecting these parameters.
Inductance # |
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REAL |
Constant |
Enter the value of the corresponding ferro-resonance filter inductance (Lf#) [H] |
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Resistance # |
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REAL |
Constant |
Enter the value of the corresponding ferro-resonance filter resistance (Rf#) [W] |
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Capacitance |
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REAL |
Constant |
Enter the value of the ferro-resonance filter capacitance (Cf2) [F] |
Internal Output VariablesInternal Output Variables
Flux Density |
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REAL |
Output |
Enter a name for the core flux density [T] |
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Total Core Current |
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REAL |
Output |
Enter a name for the total core current (loss + magnetizing) [A] |
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Magnetizing Current |
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REAL |
Output |
Enter a name for the core magnetizing current [A] |