WOLFRAM SYSTEMMODELER

IdealSwitchWithArc

Ideal switch with simple arc model

Wolfram Language

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SystemModel["Modelica.Electrical.Analog.Interfaces.IdealSwitchWithArc"]
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Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This model is an extension to the IdealSwitch.

The basic model interrupts the current through the switch in an infinitesimal time span. If an inductive circuit is connected, the voltage across the switch is limited only by numerics. In order to give a better idea for the voltage across the switch, a simple arc model is added:

When the Boolean variable off signals to open the switch, a voltage across the opened switch is impressed. This voltage starts with V0 (simulating the voltage drop of the arc roots), then rising with slope dVdt (simulating the rising voltage of an extending arc) until a maximum voltage Vmax is reached.

     | voltage
Vmax |      +-----
     |     /
     |    /
V0   |   +
     |   |
     +---+-------- time

This arc voltage tends to lower the current following through the switch; it depends on the connected circuit, when the arc is quenched. Once the arc is quenched, i.e., the current flowing through the switch gets zero, the equation for the off-state is activated i=Goff*v.

When the Boolean variable off signals to close the switch again, the switch is closed immediately, i.e., the equation for the on-state is activated v=Ron*i.

Please note: In an AC circuit, at least the arc quenches when the next natural zero-crossing of the current occurs. In a DC circuit, the arc will not quench if the arc voltage is not sufficient that a zero-crossing of the current occurs.

Please note: In case of useHeatPort=true the temperature dependence of the electrical behavior is not modelled. The parameters are not temperature dependent.

Connectors (3)

p

Type: PositivePin

Description: Positive pin (potential p.v > n.v for positive voltage drop v)

n

Type: NegativePin

Description: Negative pin

heatPort

Type: HeatPort_a

Description: Conditional heat port

Parameters (7)

useHeatPort

Value: false

Type: Boolean

Description: =true, if heatPort is enabled

T

Value: 293.15

Type: Temperature (K)

Description: Fixed device temperature if useHeatPort = false

Ron

Value: 1E-5

Type: Resistance (Ω)

Description: Closed switch resistance

Goff

Value: 1E-5

Type: Conductance (S)

Description: Opened switch conductance

V0

Value:

Type: Voltage (V)

Description: Initial arc voltage

dVdt

Value:

Type: VoltageSlope (V/s)

Description: Arc voltage slope

Vmax

Value:

Type: Voltage (V)

Description: Max. arc voltage