ImpedanceSingle phase linear impedance 
This information is part of the Modelica Standard Library maintained by the Modelica Association.
The impedance model represents a series connection of a resistor and either an inductor or capacitor.
The linear impedance connects the voltage v
with the
current i
by v = Z*i
. The resistive
component is modeled temperature dependent, so the real part R_actual = real(Z)
is determined from
the actual operating temperature and the reference input resistance real(Z_ref)
.
A conditional heat port is considered.
The reactive component X_actual = imag(Z)
is equal to imag(Z_ref)
if frequencyDependent = false
.
Frequency dependency is considered by frequencyDependent = true
, distinguishing two cases:
imag(Z_ref) > 0
: inductive caseX_actual
is proportional to f/f_ref
imag(Z_ref) < 0
: capacitive caseX_actual
is proportional to f_ref/f
Resistor, Conductor, Capacitor, Admittance, Variable resistor, Variable conductor, Variable capacitor, Variable inductor, Variable impedance, Variable admittance
useHeatPort 
Value: false Type: Boolean Description: =true, if heatPort is enabled 

T 
Value: T_ref Type: Temperature (K) Description: Fixed device temperature if useHeatPort = false 
Z_ref 
Value: Type: ComplexImpedance Description: Complex impedance R_ref + j*X_ref 
T_ref 
Value: 293.15 Type: Temperature (K) Description: Reference temperature 
alpha_ref 
Value: 0 Type: LinearTemperatureCoefficient (¹/K) Description: Temperature coefficient of resistance (R_actual = R_ref*(1 + alpha_ref*(heatPort.T  T_ref)) 
frequencyDependent 
Value: false Type: Boolean Description: Consider frequency dependency, if true 
f_ref 
Value: 1 Type: Frequency (Hz) Description: Reference frequency, if frequency dependency is considered 
R_ref 
Value: real(Z_ref) Type: Resistance (Ω) Description: Resistive component of impedance, resistance 
X_ref 
Value: imag(Z_ref) Type: Reactance (Ω) Description: Reactive component of impedance, reactance 
pin_p 
Type: PositivePin Description: Positive quasistatic singlephase pin 


pin_n 
Type: NegativePin Description: Negative quasistatic singlephase pin 

heatPort 
Type: HeatPort_a Description: Conditional heat port 
v 
Type: ComplexVoltage Description: Complex voltage 


i 
Type: ComplexCurrent Description: Complex current 

Z_ref 
Type: ComplexImpedance Description: Complex impedance R_ref + j*X_ref 
Modelica.Electrical.QuasiStationary.SinglePhase.Examples Example of transformer with short circuit impedance, transmission resistances and load 
Modelica.Electrical.QuasiStationary.MultiPhase.Basic Multiphase linear impedance 