Write principle of automatic circuit reclosers
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Re closer is a device that is used in over head distribution systems to interrupt the circuit to clear faults. Automatic rec losers have its electronic control senses and vacuum interrupters that automatically re closes to restore service if a fault is temporary. There are several attempts that may be made to clear and re energize the circuit and if the fault still exist the re closer locks out. Rec losers are made in single phase and three-phase versions, and use oil or vacuum interrupters.
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Recloser is a device that is used in over head distribution systems to interrupt the
circuit to clear faults. Automatic reclosers have its electronic control senses and
vacuum interrupters that automatically recloses to restore service if a fault is
temporary. There are several attempts that may be made to clear and reenergize the
circuit and if the fault still exist the recloser locks out. Reclosers are made in single-
phase and three-phase versions, and use oil or vacuum interrupters.
Operation
Systems where a SCADA control interface capability is required in the use of automatic
reclosers. The controls for the reclosers range from the original electromechanical
systems to digital electronics. The operating sequence of all the reclosers can be all
fast, all delayed or any combination of fast followed by delayed up. Fast operations
clear temporary faults before branch circuit line fuses are weakened. Delayed
operations allow time for down time protective devices to clear so that permanent
faults can be confined to smaller sections of the system.
A complete electronic recloser package consists of the recloser which interrupts the
circuit, an electronic control which senses over-currents and actuates the recloser and
an interconnecting control cable.
Tripping and Closing
Recloser tripping and closing are initiated by signals from the electronic control. When
fault currents in excess of the programmed minimum-trip value are detected in one or
more phases, a signal from the control actuates a low energy tripper in the operating
mechanism of the recloser to trip the opening springs and open the interrupter contacts.
Closing energy and the force required to charge the opening springs is supplied by a
high-voltage closing solenoid momentarily connected phase-to-phase through a high-
voltage contactor. At the programmed reclosing time, the control energizes a rotary
solenoid in the operating mechanism which mechanically closes the closing solenoid
contactor to connect the closing coil to its power source. The energized closing coil
pulls a plunger down, charging the opening springs.
circuit to clear faults. Automatic reclosers have its electronic control senses and
vacuum interrupters that automatically recloses to restore service if a fault is
temporary. There are several attempts that may be made to clear and reenergize the
circuit and if the fault still exist the recloser locks out. Reclosers are made in single-
phase and three-phase versions, and use oil or vacuum interrupters.
Operation
Systems where a SCADA control interface capability is required in the use of automatic
reclosers. The controls for the reclosers range from the original electromechanical
systems to digital electronics. The operating sequence of all the reclosers can be all
fast, all delayed or any combination of fast followed by delayed up. Fast operations
clear temporary faults before branch circuit line fuses are weakened. Delayed
operations allow time for down time protective devices to clear so that permanent
faults can be confined to smaller sections of the system.
A complete electronic recloser package consists of the recloser which interrupts the
circuit, an electronic control which senses over-currents and actuates the recloser and
an interconnecting control cable.
Tripping and Closing
Recloser tripping and closing are initiated by signals from the electronic control. When
fault currents in excess of the programmed minimum-trip value are detected in one or
more phases, a signal from the control actuates a low energy tripper in the operating
mechanism of the recloser to trip the opening springs and open the interrupter contacts.
Closing energy and the force required to charge the opening springs is supplied by a
high-voltage closing solenoid momentarily connected phase-to-phase through a high-
voltage contactor. At the programmed reclosing time, the control energizes a rotary
solenoid in the operating mechanism which mechanically closes the closing solenoid
contactor to connect the closing coil to its power source. The energized closing coil
pulls a plunger down, charging the opening springs.
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