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Three-Phase Breaker

Implement three-phase circuit breaker opening at current zero crossing

  • Three-Phase Breaker block

Libraries:
Simscape / Electrical / Specialized Power Systems / Power Grid Elements

Description

The Three-Phase Breaker block implements a three-phase circuit breaker where the opening and closing times can be controlled either from an external Simulink® signal (external control mode), or from an internal control timer (internal control mode).

The Three-Phase Breaker block uses three Breaker blocks connected between the inputs and the outputs of the block. You can use this block in series with the three-phase element you want to switch. The arc extinction process of the Three-Phase Fault block is the same as for the Breaker block. See the Breaker block reference pages for details on the modeling of the single-phase breakers.

If the Three-Phase Breaker block is set in external control mode, a control input appears in the block icon. The control signal connected to the Simulink input must be either 0, which opens the breakers, or any positive value, which closes the breakers. For clarity, a 1 signal is commonly used to close the breakers. If the Three-Phase Breaker block is set in internal control mode, the switching times are specified in the dialog box of the block. The three individual breakers are controlled with the same signal.

Series Rs-Cs snubber circuit are included in the model. They can be optionally connected to the three individual breakers. If the Three-Phase Breaker block happens to be in series with an inductive circuit, an open circuit or a current source, you must use the snubbers.

Examples

See the power_3phlinereclose and power_3phseriescomp examples for circuits using the Three-Phase Breaker block.

Ports

Input

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Control input for the breaker.

Dependencies

To enable this port, select the External parameter.

Conserving

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Specialized electrical conserving port associated with the phase A at the input of the breaker.

Specialized electrical conserving port associated with the phase B at the input of the breaker.

Specialized electrical conserving port associated with the phase C at the input of the breaker.

Specialized electrical conserving port associated with the phase A at the output of the breaker.

Specialized electrical conserving port associated with the phase B at the output of the breaker.

Specialized electrical conserving port associated with the phase C at the output of the breaker.

Parameters

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To edit block parameters interactively, use the Property Inspector. From the Simulink Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.

Initial status of the breakers. The initial status is the same for the three breakers. Depending on the initial status, the icon shows a closed contact or an open contact.

If selected, the switching of phase A is activated. If not selected, the breaker of phase A stays in its initial status specified in the Initial status parameter.

If selected, the switching of phase B is activated. If not selected, the breaker of phase B stays in its initial status specified in the Initial status parameter.

If selected, the switching of phase C is activated. If not selected, the breaker of phase C stays in its initial status specified in the Initial status parameter.

Specify the vector of switching times when using the Three-Phase Breaker block in internal control mode. At each transition time the selected breakers opens or closes depending to their initial state.

Dependencies

To enable this parameter, clear the External parameter.

If selected, adds a fourth input port to the Three-Phase Breaker block for an external control of the switching times of the breakers. The switching times are defined by a Simulink signal (0-1 sequence).

Internal breaker resistance, in ohms (Ω). The Breaker resistance Ron parameter cannot be set to 0.

Snubber resistance, in ohms (Ω). Set this parameter to inf to eliminate the snubbers from the model.

Snubber capacitance, in farads (F). Set this parameter to 0 to eliminate the snubbers, or to inf to get resistive snubbers.

Select Breaker voltages to measure the voltage across the three internal breaker terminals.

Select Breaker currents to measure the current flowing through the three internal breakers. If the snubber devices are connected, the measured currents are the ones flowing through the breakers contacts only.

Select Breaker voltages and currents to measure the breaker voltages and the breaker currents.

Place a Multimeter block in your model to display the selected measurements during the simulation. In the Available Measurements list box of the Multimeter block, the measurements is identified by a label followed by the block name and the phase:

Measurement

Label

Breaker voltages

Ub <block_name> /Breaker A:

Breaker currents

Ib <block_name> /Breaker A:

Extended Capabilities

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

Version History

Introduced before R2006a