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Description

Capacitive Divider Transformer


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Voltage transformer with capacitive coupling

Mask and Parameters

  • General tab:


Capacitive Divider

  • C1, C2: Capacitances of voltage divider (farad or pu)


Tuning Circuit Parameters

RcTuning circuit resistance (ohm or pu)
LcTuning circuit inductance (henry or pu)
CcTuning circuit capacitance (farad or pu)

The values of these parameters are chosen so that the resonance frequency
of the series impedance on the secondary side is 60 Hz.


Load Parameters

  • R, RL, LL: Load resistances (ohm or pu) and load inductance (henry or pu)


Primary Winding Parameters

NpNumber of turns (default: np = 18240)
Rp, LpLeakage resistance (ohm or pu) and inductance (henry or pu)
CpStray capacitance (farad)
RmResistance (ohm) representing magnetization losses

Secondary Winding Parameters

NsNumber of turns (default: ns = 100)
Rs, LsLeakage resistance (ohm or pu) and inductance (henry or pu)


  • Saturation tab:


Saturation parameters:

Number of pointsNumber of segments of the current-flux saturation curve; only the positive part of the curve must be specified, the negative part being completed by symmetry
Saturation currentThe peak value of the current (in ampere or pu) for each segment of the saturation curve. The origin (0.0,0.0) is implied. The number of segments must be equal to the parameter “number of points”
Saturation fluxThe peak value of the flux (in volt-second or pu) for each segment of the saturation curve. The origin (0.0,0.0) is implied. The number of segments must be equal to the parameter “number of points”

Note that in this model, the saturation branch is located on the primary side of the transformer. Therefore, the saturation current and flux parameters should be referred to that side.

Ports, Inputs, Outputs and Signals Available for Monitoring

Ports


Net_1Primary winding connection (supports only 3-phase connections)


Inputs

  • None

Outputs

  • None

Sensors


VOUT(a,b,c)Output voltage (V)
VMAG(a,b,c)Voltage in magnetization branch (V)
IMAG(a,b,c)Magnetization current (A)
FLUX(a,b,c)Mutual flux in the transformer (V.s)