Auto Recloser Working Principle and Setup | Lab Class

Auto-reclosers are most commonly available in three-pole and single pole versions. With the three-pole versions, all three phases are disconnected under fault conditions, regardless of the fault type. This allows generators on the system to drift out of synchronisation, which means that synchronisation checks must be made before the reclose operation takes place.
The choice of recloser type depends on the application and it is worth noting that the principal aim of using reclosers often differs between medium-voltage distribution applications and high-voltage transmission applications. In the first case, the main emphasis is likely to be on ensuring the continuity of power supply; so three-phase reclosers are often chosen. In the second case, however, the emphasis shifts to ensuring stability and synchronisation, so single-phase reclosers may be more appropriate.
This type of operation has the advantage that it protects the expensive fuse in the case of transient faults, but the downside is that there is likely to be more disruption of the supply to consumers connected to the feeder served by the recloser.
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