Users' questions

What is the automatic reclosing?

What is the automatic reclosing?

Automatic reclosing relay is designed to initiate multiple reclosures of a circuit breaker which has been tripped by protective relaying. It is essentially a timing device, with a heavy-duty stepping switch operating contacts in response to impulses from a solid-state electronic timing circuit.

What is a recloser used for?

Like a circuit breaker on household electric lines, it shuts off electric power when trouble occurs, such as a short circuit. Where a household circuit breaker remains shut off until it is manually reset, a recloser automatically tests the electrical line to determine whether the trouble has been removed.

What does a Sectionalizer do?

A sectionalizer is a protective device that automatically isolates a faulted section of line from the rest of the distribution system. A sectionalizer should not be confused with a recloser; it does not interrupt fault current.

What are the advantages of auto reclosing?

Auto-reclosing circuit breakers enhance the stability margins. They improve the system’s reliability. In the transmission system with automatic reclosing circuit breakers, there is no need for an operator to reclose the circuit breaker contacts manually for temporary and semi-permanent faults.

What is a reclosing relay?

What is oneshot reclosing?

Definition: An auto-reclose sequence that provides only one reclosing operation, lock-out of the CB occurring if it subsequently trips.

What is automatic line Sectionalizer?

Definition: A self-contained circuit-opening device that automatically opens the main electrical circuit after sensing and responding to a predetermined number of successive main current impulses.

What is the difference between a recloser and a breaker?

Circuit breakers are most often used in distribution substations, whereas reclosers are most often used beyond the substation, out on the overhead distribution lines. Reclosers are typically available with symmetrical short-circuit ratings of 12.5 kA or 16 kA, with some offerings at lower or higher currents.