4/15/2023 0 Comments Automatic transfer switchThe transfer switch shall be interlocked to provide the operation specified herein.The in-phase monitor shall be automatic transfer switch. The in-phase monitor shall incorporate silicon semiconductor control logic and an industrial grade output relay, rated for operation of the transfer switch. In-phase transfer shall be provided in either direction whenever both power sources are above 70% of nominal voltage. The motor currents upon re-connection shall not exceed normal starting values. The monitor shall initiate operation of the transfer switch when the remote or local push-button is actuated and the phase angle between both sources is approaching zero phase angle. The transfer switch shall include an in phase monitor to protect against abnormal inrush currents, which may result from out-of-phase transfer of motor loads. The neutral of the normal and emergency power sources shall be switched through a fourth pole of the transfer switch which shall be non-overlapping (break before make) and shall operate with the main poles of the switch. Other Controls as necessary for the smooth automatic function of the system.Test switch and necessary equipment for remote test switch.Mounted pilot light to indicate switch in emergency position.Mounted pilot light to indicate switch in normal position.Two normally open and two normally closed auxiliary contacts on main shaft.If the emergency source fails and power is available from the normal source, the time delay shall be defeated and the transfer operation immediately initiated. Adjustable time delay on automatic transfer to normal, 15 to 30 minutes in 1 minute intervals.Adjustable time delay on generator start sequence, 10 seconds maximum, in all second intervals. Re-transfer to normal when all phase voltages are 90 percent or more. Transfer to emergency source when voltage on any phase drops to 70 percent or less.
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