Three-Phase Breaker

Implement three-phase circuit breaker opening at current zero crossing

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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

Single-Pole Reclosing of a Three-Phase Line

The use of three-phase blocks to study phase-to-ground fault and single-pole reclosing of a 735-kV transmission line.

• Open Model

Three-Phase Series Compensated Network

The use of three-phase blocks to study transients on a series-compensated 735-kV transmission system

• Open Model

Ports

Input

com — Control input

Simulink signal

Control input for the breaker.

Dependencies

To enable this port, select the External parameter.

Conserving

A — Phase A at input of breaker

specialized electrical

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

B — Phase B at input of breaker

specialized electrical

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

C — Phase C at input of breaker

specialized electrical

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

a — Phase A at output of breaker

specialized electrical

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

b — Phase B at output of breaker

specialized electrical

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

c — Phase C at output of breaker

specialized electrical

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

Parameters

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 — Initial status of breakers

open (default) | closed

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.

Switching of: Phase A — Switching of phase A

on (default) | off

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.

Switching of: Phase B — Switching of phase B

on (default) | off

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.

Switching of: Phase C — Switching of phase C

on (default) | off

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.

Switching time (s) — Vector of switching times

[1/60 5/60] (default) | vector of scalars

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.

External — Option to enable external control signal

off (default) | on

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).

Breakers resistance Ron — Internal breaker resistance

0.01 (default) | positive scalar

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

Snubbers resistance Rs — Snubber resistance

1e6 (default) | nonnegative scalar

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

Snubbers capacitance Cs — Snubber capacitance

inf (default) | nonnegative scalar

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

Measurements — Option for measurements

None (default) | Breaker voltages | Breaker currents | Breaker voltages and currents

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