Circuit Breaker (Three-Phase)

Three-phase circuit breaker controlled by external signal

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  • Circuit Breaker (Three-Phase) block

Description

The Circuit Breaker (Three-Phase) block models a three-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. Each phase in the composite three-phase port ~1 connects to the corresponding phase in the port ~2.Closed Resistance
vT ≥ Threshold

When the current in any phase of the composite port ~1 crosses zero, the phase disconnects from the corresponding phase at port ~2. The breaker is open.

Open Conductance

Ports

Input

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Scalar physical signal control port.

Dependencies

This port is visible only when Block Choice is set to Expanded three-phase ports| PS control port or Composite three-phase ports| PS control port.

Conserving

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Expandable three-phase electrical conserving port.

Expandable three-phase electrical conserving port.

Positive electrical conserving port.

Dependencies

This port is visible only when Block Choice is set to Expanded three-phase ports| Electrical control port or Composite three-phase ports| Electrical control port.

Negative electrical conserving port.

Dependencies

This port is visible only when Block Choice is set to Expanded three-phase ports| Electrical control port or Composite three-phase ports| 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 each phase as its current crosses zero. When the control port voltage falls below the threshold, the breaker closes.

Model Examples

Three-Phase Synchronous Machine Control

Three-Phase Synchronous Machine Control

Control and initialize a Synchronous Machine (SM). The test circuit shows the SM operating as a generator. The terminal voltage is controlled using an AVR and the speed is controlled using a governor.

Three-Phase Custom Simplified Synchronous Machine

Three-Phase Custom Simplified Synchronous Machine

How simplify the custom Simscape™ synchronous machine model.

Marine Full Electric Propulsion Power System

Marine Full Electric Propulsion Power System

A representative marine half-ship electrical power system with base load, hotel load, bow thrusters and electric propulsion.

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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