Energy conserving transformer power supply system
First Claim
1. An energy conserving transformer power supply system having a plurality of power transformer groups at various remote locations, a common power feeder, a common power switching means, a master program timer switching means, said common power feeder supplying said power transformer groups, said master program timer switching means operatively connected to said power switching means controlling the power flow through said common power feeder, each of said transformer groups comprising:
- a main transformer of large capacity, an auxiliary transformer of relatively small capacity, a common load, a transfer switching means, a relay control means, said transfer switching means adapted to alternately transfer power to said common load through said main transformer or said auxiliary transformer, each of said relay control means operatively connected to said common feeder, said relay control means adapted to control the alternate operation of said transfer switching means in accordance with predetermined timing schedules of the occupancy and non-occupancy periods of said master program timer switching means being in operational relationship with each of said relay control means, thereby to fully de-energize said main transformer of each said transformer groups during said non-occupancy periods.
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Abstract
An energy conserving transformer power supply system comprising one main transformer of large capacity to carry the maximum load under normal occupancy hours and one auxiliary transformer of relatively very small capacity to carry the utmost minimum load under non-occupancy hours (nights & week-end) being supplied from the same load distribution center. A transfer switching means is provided to alternately transfer the power supply from main to auxiliary transformer or vice-versa in response to the control action of a program timer switching means in accordance with the timing schedule of the occupancy and non-occupancy hours.
Additional current sensing means is provided to override the program timer switching action should the demand load exceed a predetermined low level and to restore the main control action on the program timer after cessation of such temporary condition.
An alternate simplified arrangement provides a steady energization of the auxiliary transformer, while the de-energization of the main transformer is controlled by a program timer in combination with various control means.
For a plurality of transformer units installed on various floors of tenant spaces in office buildings, a master program timer control means is provided in a central location to maintain the building control over the time-scheduled operation of the transfer switching means, and temporary overriding is selectively provided.
By the controlled de-energization methods provided in this invention, a substantial reduction of the no-load losses of the main transformer is accomplished.
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Citations
9 Claims
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1. An energy conserving transformer power supply system having a plurality of power transformer groups at various remote locations, a common power feeder, a common power switching means, a master program timer switching means, said common power feeder supplying said power transformer groups, said master program timer switching means operatively connected to said power switching means controlling the power flow through said common power feeder, each of said transformer groups comprising:
- a main transformer of large capacity, an auxiliary transformer of relatively small capacity, a common load, a transfer switching means, a relay control means, said transfer switching means adapted to alternately transfer power to said common load through said main transformer or said auxiliary transformer, each of said relay control means operatively connected to said common feeder, said relay control means adapted to control the alternate operation of said transfer switching means in accordance with predetermined timing schedules of the occupancy and non-occupancy periods of said master program timer switching means being in operational relationship with each of said relay control means, thereby to fully de-energize said main transformer of each said transformer groups during said non-occupancy periods.
- View Dependent Claims (2, 3, 4)
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5. An energy conserving transformer power supply system having a plurality of power transformer groups at various remote locations, a common power feeder, a common power switching means, a master program timer switching means, said common power feeder supplying said power transformer groups, said master program timer switching means operatively connected to said power switching means controlling the power flow through said common power feeder, each of said transformer groups comprising:
- a main transformer of large capacity, an auxiliary transformer of relatively small capacity, a main load, a power switching means, an auxiliary load being continuously supplied by said auxiliary transformer, a relay control means, said power switching means adapted to switching power to said main load through said main transformer, each of said relay control means operatively connected to said common feeder, said relay control means adapted to control the switching operation of of said power switching means in accordance with predetermined timing schedules of the occupancy and non-occupancy periods of said master program timer switching means being in operational relationship with each of said relay control means, thereby to fully de-energize said main transformer of each said transformer groups during the said non-occupancy periods.
- View Dependent Claims (6, 7, 8, 9)
Specification