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Circuit Breaker (Three-Phase)

Three-phase circuit breaker controlled by external signal

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  • Circuit Breaker (Three-Phase) block

Libraries:
Simscape / Electrical / Switches & Breakers

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 and the Breaker Behavior parameter control 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 ≥ ThresholdOpen when current crosses zero after 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
Open when vT >= ThresholdThe breaker is open.

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.

Ports

Input

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Scalar physical signal control port.

Dependencies

To enable this port, set Modeling option 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

To enable this port, set Modeling option to Expanded three-phase ports| Electrical control port or Composite three-phase ports| Electrical control port.

Negative electrical conserving port.

Dependencies

To enable this port, set Modeling option to Expanded three-phase ports| Electrical control port or Composite three-phase ports| Electrical control port.

Parameters

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Whether to model composite or expanded three-phase ports and physical signal or electrical control ports.

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 each phase as its current crosses zero. If you set Breaker Behavior to Open when vT >= Threshold, the breaker opens each phase 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

See Also

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