Ch.(3)-part(5)- Lockout Relay 86 - YouTube - Aside from breaker contacts, you will see relays which include anti-pump relay 52y, low gasoline relay 63x, beneath voltage relay 27 etc within the breaker scheme. The contacts from each of those relays are interlocked with different relays in this type of manner that they either allow or now not permit the breaker operation. Information the breaker scheme is critical in case you plan on designing a substation. Pretty regularly, it is overwhelming to make feel of the complete scheme at a look. Consequently, the discern under depicting a circuit breaker scheme will be used to simplify and give an explanation for various factors of the pcb’s design and its control.
A form ‘a‘ contact represents a generally open (n.O.) Touch. Therefore while the breaker is open, its 52a contacts are open. Whilst the breaker is closed, the 52a contacts are closed. The 52a contact follows the reputation of the breaker. Electricity circuit breakers (pcb) destroy an electrical circuit to isolate faults. They also re-close to make a circuit after the fault is eliminated. To permit this open and near operation, it's miles operated with the aid of either a far flung relay or a local switch. A faraway relay is positioned at a faraway region inclusive of a manage room while the switch is located inside the circuit breaker junction container.
From the diagram, the breaker is outfitted with a forty three switch that toggles among neighborhood ride and remote experience. Positioning it in neighborhood permits the persons on the breaker junction box to ride the breaker by way of final the manipulate transfer (cs). Switching it to remote function lets in the relays in the manipulate house to shut their touch and experience the breaker. Modern-day pcb’s using sulfur hexa-flouride (sf6) gasoline to extinguish an arc are geared up with ansi ’sixty three’ relay. To save you breaker harm due to flash-overs for the duration of low fuel conditions, tripping of breaker is cut-out by using this relay’s touch. Notice in parent 1 how the contacts from this relay are strategically positioned within the close and journey circuit to cut out any sign from the relays or switches.
A form ‘b‘ contact represents a generally closed (n.C.) Contact. It operates exactly opposite of what an ‘a’ does. While the breaker is open, the 52b contacts are closed. Whilst the breaker is closed, the 52b contacts are open.