A recloser is an automatic, high-voltage electric switch. 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. If the problem was only temporary, then the recloser automatically resets itself and restores the electric power.
Automatic circuit reclosers are recognized by electric utilities throughout the world as an essential device for achieving their prime goal: providing maximum continuity of electric service to their customers simply and economically. Reclosers sense and interrupt fault currents and automatically restore service after a momentary outage has occurred. The automatic circuit recloser is essentially a self-contained device with the necessary intelligence to sense overcurrents to time and interrupt fault currents and to re-energize the line by reclosing automatically. If a fault is permanent, the recloser locks open after a preset number of operations (usually three or four), isolating the faulted section from the main part of the system.
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Three-phase reclosers are used on three-phase circuits to improve system reliability and where lockout of all three phases is required for any permanent fault, to prevent single phasing of three-phase loads such as large three-phase motors. The recloser selection is based upon electrical ratings required, interrupting and insulation medium, and the selection of hydraulic or electronic control.
Microprocessor-based and/or electronic controls are housed in a cabinet separate from the recloser and conveniently permits changes to operational settings. A wide range of accessories is available to customize the basic operation, solving many application problems.
The AN/TPQ-37 is an electronically steered radar, meaning the radar does not actually move while in operation. The radar scans a 90-degree sector for incoming rocket, artillery and mortar fire. Upon detecting a possible incoming round, the system verifies the contact before initiating a track sequence, continuing to search for new targets. The incoming round/rocket is tracked during its initial upward/launch trajectory (i.e., the linear portion of its flight path) prior to reaching apogee. A computer program analyzes the track data and then extrapolates the round's point of origin. This calculated point of origin is then reported to the operator with map coordinates, thus allowing friendly artillery to direct counter-battery fire towards the enemy artillery. The system has a reported range of up to 31 miles (50 km). The system may also be operated in a friendly fire mode to determine the accuracy of counterbattery return fire.
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