Circuit Breaker

Single-pole single-throw circuit breaker

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  • 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 controls the block behavior.

ConditionBlock BehaviorResistance Parameter Used
vT < ThresholdThe breaker is closed. Port 1 connects to port 2.Closed Resistance
vT ≥ Threshold

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

Open Conductance

Ports

Refer to the figure for port locations.

Input

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Scalar physical signal control port.

Dependencies

This port is visible only when Block Choice is set to PS control port.

Conserving

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Electrical conserving port.

Electrical conserving port.

Positive electrical conserving port.

Dependencies

This port is visible only when Block Choice is set to Electrical control port.

Negative electrical conserving port.

Dependencies

This port is visible only when Block Choice is set to Electrical control port.

Parameters

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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. When the voltage rises above the threshold, the breaker opens as its current crosses zero. When the control port voltage falls below the threshold, the breaker closes.

Model Examples

Frequency-Dependent Transmission Line

Frequency-Dependent Transmission Line

A custom frequency-dependent transmission line model. The characteristic admittance and propagation function are first derived from the frequency-dependent resistance, reactance, and susceptance. The derived values are fitted using RF Toolbox™. The Universal Line Model (ULM) [1] is then implemented in Simscape™ based on the fitted parameters. The results from the frequency-dependent transmission line model and the classic pi-section transmission line model are compared.

Extended Capabilities

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

See Also

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Topics

Introduced in R2013b

Simscape Electrical Documentation

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