Circuit Breaker (Three-Phase)
Three-pole switch controlled by an external signal.
Description
The Circuit Breaker (Three-Phase) unit simulates a three-phase circuit breaker 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 Breaker Behaviour parameter determine the state of the block.
| Condition | Breaker Behaviour | 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 |
|
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. |
||
Parameters
Closed resistance - resistance of the closed switch
`1e-3 ohms (by default)
The resistance between ports ~1 and ~2 when the switch is closed.
Open conductance is the conductance of the open switch
`1e-6 1/ohm (by default).
Conductance between ports ~1 and ~2 when the switch is open.
Threshold, V - threshold voltage
0.5 V (by default).
The threshold voltage for the vT control port. The block uses the threshold voltage and the vT value at the start of the simulation to determine whether the breaker is initially open or closed. If the Breaker Behavior parameter is set to zerocrossing, then when the voltage rises above the threshold voltage, the breaker opens each phase when its current crosses zero. If the Breaker Behavior parameter is set to simple, the breaker opens each phase as soon as the voltage rises above the threshold value. When the voltage on the control port falls below the threshold, the breaker closes.
Breaker Behaviour - the behaviour of the breaker when vT rises above the threshold value
zerocrossing (by default) | simple
Switch behaviour when the value on the control port vT is greater than or equal to the value of the Threshold, V parameter. The switch can open either as soon as the voltage rises above the threshold or when its current crosses zero.