Circuit Breaker (Three-Phase)
A three-pole switch controlled by an external signal.
blockType: AcausalElectricPowerSystems.Switches.ThreePhaseCircuitBreaker
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Description
Block Circuit Breaker (Three-Phase) Simulates a three-phase switch that uses an external signal and phase current values to break an electrical circuit.
The table below shows how the external signal vT and the value of the parameter Breaker Behavior determine the state of the block.
| Condition | Block behavior | Resistance parameter used | |
|---|---|---|---|
vT < Threshold |
The switch is closed. Each phase of port ~1 is connected to the corresponding phase of port ~2. |
Closed Resistance |
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vT ≥ Threshold |
Opens when the current crosses zero after vT ≥ Threshold |
When the current in any phase of port ~1 crosses zero, the phase is disconnected from the corresponding phase on port ~2. The switch is open. |
Open Conductance |
Opens when vT ≥ Threshold |
The switch is open. |
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Parameters
Closed resistance — resistance of the closed switch
1e−3 ohms (by default)
Resistance between ports ~1 and ~2 when the switch is closed.
Open conductivity — conductivity of the open switch
1e−6 1/ohm (by default)
Conductivity between ports ~1 and ~2 when the switch is open.
Threshold, V — threshold voltage
0.5V (by default)
The threshold voltage for the control port is vT. The unit uses the threshold voltage and the value of vT at the beginning of the simulation to determine whether the switch is initially open or closed. If the Breaker Behavior parameter is set to zerocrossing then when the voltage rises above the threshold value, the switch opens each phase when its current crosses zero. If the Breaker Behavior parameter is set to simple, then the switch opens each phase as soon as the voltage rises above the threshold value. When the voltage on the control port drops below the threshold value, the switch closes.
Breaker Behavior — the behavior of the breaker when vT rises above the pass threshold value:q[<br>] zerocrossing (by default) | simple
The behavior of the switch when the value on the control port vT is greater than or equal to the value of the parameter Threshold, V. The switch can be opened either as soon as the voltage rises above the threshold value, or when its current crosses zero at the same time.