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Controlled Closing Switch With Arc

Controlled ideal electrical closer with simple arc model

 

Description

Equations

Variables

Connections

Parameters

Modelica Standard Library

Description

The Controlled Closing Switch with Arc (or Controlled Closer With Arc) component models a two-terminal, single-pole, electrical switch whose contacts arc when opened, which occurs when the control input voltage drops below a defined level.

This model is an extension of the IdealClosingSwitch. 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. To better approximate the actual voltage across the switch, a simple arc model is added. When the Boolean input control signals to open the switch, a voltage is impressed across the opened switch. This voltage starts at V0 (simulating the voltage drop of the arc roots), rises with slope V. (simulating the rising voltage of an extending arc) until a maximum voltage Vmax is reached.

Depending on the connected circuit, the arc voltage reduces the current through the switch.  When the current reaches zero the arc is quenched and the switch goes to the off-state. When the Boolean input control signals to close the switch again, the switch is closed immediately.

In an AC circuit, 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 to force the current to zero.

Equations

{v=Ronioni=Goffvquenchedv=minVmax,V0+V.ttSwitchotherwise

tSwitch=time control goes true

quenched=offivGoffprequenched

off&equals;vcontrol<level

i&equals;ip&equals;in

v&equals;vpvn

icontrol&equals;0

LossPower&equals;vi

Variables

Name

Units

Description

Modelica ID

v

V

Voltage drop between the two pins

v

vx

V

Voltage at pin x, xn&comma;p

x.v

i

A

Current flowing from pin p to pin n

i

ix

A

Current into pin x, xn&comma;p

x.i

LossPower

W

Loss power leaving component via HeatPort

LossPower

TheatPort

K

Temperature of HeatPort

T_heatPort

Connections

Name

Description

Modelica ID

p

Positive pin

p

n

Negative pin

n

control

Electrical control

control

Heat Port

Conditional heat port

heatPort

Parameters

Name

Default

Units

Description

Modelica ID

level

0.5

V

Switch level

level

Ron

1·10−5

Ω

Closed switch resistance

Ron

Goff

1·10−5

S

Opened switch conductance

Goff

V0

30

V

Initial arc voltage

V0

V&period;

10000

Vs

Arc voltage slope

dVdt

Vmax

60

V

Max. arc voltage

Vmax

Use Heat Port

false

 

True (checked) means heat port is enabled

useHeatPort

Modelica Standard Library

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.

See Also

Analog Components

Electrical Library

Switches