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Circuit Breaker

Single-pole single-throw circuit breaker

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  • Simscape / Electrical / Switches & Breakers

  • Circuit Breaker block

Description

The Circuit Breaker block models a single-phase circuit breaker that uses an external signal and phase current information to break an electrical circuit.

The table shows how the external signal vT and the Breaker Behavior parameter control the block behavior.

ConditionBlock BehaviorResistance Parameter Used
vT < ThresholdThe breaker is closed. Port 1 connects to port 2.Closed Resistance
vT ThresholdOpen when current crosses zero after vT >= Threshold

When the current in port 1 goes through zero, the phase disconnects from port 2. The breaker is open.

Open Conductance
Open when vT >= Threshold

The breaker is open..

Ports

Refer to the figure for port locations.

Input

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Scalar physical signal control port.

Dependencies

To enable this port, set Modeling option to PS control port.

Conserving

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Electrical conserving port.

Electrical conserving port.

Positive electrical conserving port.

Dependencies

To enable this port, set Modeling option to Electrical control port.

Negative electrical conserving port.

Dependencies

To enable this port, set Modeling option to Electrical control port.

Parameters

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Whether to specify physical or electrical control port for the switch gate.

Resistance between ports 1 and 2 when the breaker is closed.

Conductance between ports 1 and 2 when the breaker is open.

Threshold voltage for the control port vT. The block uses the threshold voltage and the value of vT at the start of the simulation to determine whether the breaker is initially open or closed. If you set Breaker Behavior to Open when current crosses zero after vT >= Threshold, when the voltage rises above the threshold, the breaker opens as its current crosses zero. If you set Breaker Behavior to Open when vT >= Threshold, the breaker opens as soon as the voltage rises above the threshold. When the control port voltage falls below the threshold, the breaker closes.

Breaker Behavior when the value at the control port vT is greater than or equal to the value of the Threshold parameter. The breaker can open either as soon as the voltage rises above the threshold, or when its current also crosses zero.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2013b