An electrical outage lasting two minutes or less. The recloser will automatically test and restore power to the circuit on temporary faults. With persistent faults, the recloser will remain in the open position and prevent itself from making any more automatic tests of the circuit. For example, once a bus is energized, the relay senses the problem and trips circuit breakers to isolate the problem, keeping it limited to the original problem area. Most residential and business customers receive electricity from secondary distribution lines.
Electricity can then move through the undamaged part of the system without interruption.
The tranmission system carries electric power at very high voltages, generally between 50,000 and 500,000 volts. It also carries electricity over long distances, usually from generating sources to a substation for voltage reduction.