Measuring Transformers

There are three models of measuring transformers in HYPERSIM®. These are voltage transformers with capacitive coupling, current transformers, and finally voltage transformers with magnetic coupling.

Icons and diagrams of voltage and current transformers

Capacitive Divider

C1, C2: Capacitances of voltage divider (farad);
Rc, Lc, Cc: Respectively resistance (ohm), capacitance (farad) and inductance (henry) of the tuning circuit. The values of these parameters are chosen so that the resonance frequency of the series impedance on the secondary side is 60 Hz.

Primary Winding Parameters

Number of turns	(default: np = 18240)
Rp, Lp	Leakage resistance (ohm) and inductance (henry)
Rm	Resistance (ohm) representing magnetization losses
Cp	Stray capacitance (farad)

Saturation parameters:

Number of points	The value of the current (in ampere) 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”
lsat	The value of the flux (in volt-second) 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”

Secondary Winding Parameters

Number of turns	(default: ns = 100)
Rs, Ls	Leakage resistance (ohm) and inductance (henry)
R, RL, LL	Resistances (ohm) and load inductance (henry)

List of Available Signals
At acquisition, the following signals are made available by the sensors:

VOUT(a, b, c)_label	Output voltage (V)
VMAG(a,b,c)_label	Voltage in magnetization branch (V)
IMAG(a,b,c)_ label	Magnetization current (A)
FLUX(a,b,c)_label	Mutual flux in the transformer (V.s)
VLOADSEC(a,b,c,n)_label	Load voltage on the secondary
VLOADTERT(a,b,c,n)_label	Load voltage on the tertiary
ILOADSEC(a,b,c,n)_label	Load current on the secondary
ILOAD TERT(a,b,c,n)_label	Load current on the tertiary
ILOAD TERT(0)_label	Ground current on the tertiary

Control Panel of Measuring Transformers

Figures below show the control panel of voltage transformers with capacitive voltage divider;
Figures below show the control panel of the current transformer and Figures 8 - 42 to 8- 47 show the control panel of the voltage transformer with magnetic coupling;

Control Panel of a Voltage Transformer with Capacitive Voltage Divider (General)

Control Panel of a Voltage Transformer with Capacitive Coupling (Saturation)

Winding connection in a current transformer (configuration)

Saturation Characteristic of a Current Transformer (Saturation)

Saturation Characteristic of a Current Transformer (Hysteresis)

Voltage Transformer with Magnetic Coupling (General)

Voltage Transformer with Magnetic Coupling (Saturation)

Figure 8 - 44 Voltage transformer with magnetic coupling (general)

Figure 8 - 45 Voltage transformer with magnetic coupling (configuration)

Voltage Transformer with Magnetic Coupling (Saturation)

Voltage Transformer with Magnetic Coupling (Hysteresis)