Implement three-phase circuit breaker opening at current zero crossing
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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.
The 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. Choices are
open (default) or
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. Default is selected.
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. Default is selected.
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. Default is selected.
This parameter is available only if the External check box is cleared.
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. Default is
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). Default is cleared.
The internal breaker resistances, in ohms (Ω). The Breaker
resistance Ron parameter cannot be set to
0. Default is
The snubber resistances, in ohms (Ω). Set this parameter to
eliminate the snubbers from the model. Default is
The snubber capacitances, in farads (F). Set this parameter to
eliminate the snubbers, or to
inf to get resistive snubbers. Default is
Breaker voltages to measure the voltage across the
three internal breaker terminals.
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.
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:
If the Three-Phase Breaker block is set in external control mode, a Simulink input is added to the block to control the opening and closing of the three internal breakers.