Wireless control of power transfer switches for electrical load management
First Claim
1. Apparatus for connecting a secondary power source to electrical loads that are designated for removal from a primary power source during times requiring load reduction, comprising:
- an automatic transfer switch coupled between the primary power source and the electrical loads and between the secondary power source and the electrical loads;
a remotely controllable secondary load reduction transfer switch coupled between the primary power source and the electrical loads and between the secondary power source and the electrical loads;
logic that enables the remotely controllable secondary load reduction transfer switch to operate only when primary power is available and when commanded to do so; and
a command process for sending a command for the remotely controllable secondary load reduction transfer switch that is transferred to the logic of the remotely controllable secondary load reduction transfer switch to cause it to connect the secondary power source to electrical loads coupled thereto that are designated for disconnection from the primary power source during times requiring load reduction.
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Accused Products
Abstract
Methods and apparatus that couple standby power to certain non-critical loads to implement load reduction and avoid power shortages and resultant blackouts. A primary power source is coupled to an electrical breaker panel that distributes power to a plurality of loads including non-critical loads, critical loads, and load reduction loads. A secondary power source is coupled to an automatic transfer switch that distributes power to the critical loads from the secondary power source if power is not available from the primary power source. A load reduction transfer switch, wired in parallel to the automatic transfer switch, distributes power from the secondary power source to the load reduction loads to reduce power demand on the primary source only when power from the primary power source is available and during times requiring load reduction. Preferably, the load reduction transfer switch is wirelessly controlled to permit simultaneous load reduction at multiple sites.
187 Citations
20 Claims
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1. Apparatus for connecting a secondary power source to electrical loads that are designated for removal from a primary power source during times requiring load reduction, comprising:
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an automatic transfer switch coupled between the primary power source and the electrical loads and between the secondary power source and the electrical loads;
a remotely controllable secondary load reduction transfer switch coupled between the primary power source and the electrical loads and between the secondary power source and the electrical loads;
logic that enables the remotely controllable secondary load reduction transfer switch to operate only when primary power is available and when commanded to do so; and
a command process for sending a command for the remotely controllable secondary load reduction transfer switch that is transferred to the logic of the remotely controllable secondary load reduction transfer switch to cause it to connect the secondary power source to electrical loads coupled thereto that are designated for disconnection from the primary power source during times requiring load reduction. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electrical power distribution system comprising:
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a primary power source;
an electrical breaker panel that distributes power to a plurality of loads comprising non-critical loads, critical loads, and load reduction loads;
a secondary power source;
an automatic transfer switch for distributing power to the critical loads from the secondary power source if power is not available from the primary power source;
a load reduction transfer switch, wired in parallel to the automatic transfer switch, for distributing power to the load reduction loads to reduce power demand on the primary power source. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
a two position contactor operative such that in one position, the breaker panel is connected to the primary power source, and in the other position, the breaker panel is connected to the secondary power source; and
a transfer switch control circuit that (1) senses the presence or absence of voltage from primary power source, and if the voltage is lost, provides a start signal to the secondary power source, causing it to begin producing power, (2) monitors power produced by the secondary power source, and when a stable voltage and frequency are reached, initiates transfer of power to the loads from the primary power source to the secondary power source; and
(3) selectively controls an actuator via a control signal to cause the power transfer from the primary power source to the secondary power source and vice-versa.
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13. The system recited in claim 7 wherein the load reduction transfer switch includes control logic circuitry comprising:
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a two position contactor operative such that in one position, the breaker panel is connected to the primary power source, and in the other position, the breaker panel is connected to the secondary power source;
a transfer switch control circuit that (1) senses the presence or absence of voltage from the primary power source, and if the voltage is lost, provides a start signal to the secondary power source, causing it to begin producing power, (2) monitors power produced by the secondary power source, and when a stable voltage and frequency are reached, initiates transfer of power to the loads from the primary power source to the secondary power source; and
(3) selectively controls an actuator via a control signal to cause the power transfer from the primary power source to the secondary power source and vice-versa; and
a load reduction control circuit for receiving a command that applies power from the primary power source to an actuator that breaks connection of the voltage to the transfer switch control circuit and initiates startup of the secondary power source, the transfer of power to the load reduction loads, and that keeps the transfer switch from operating if power from the primary power source is absent.
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14. The system recited in claim 13 wherein the load reduction control circuit comprises a wireless load reduction control circuit.
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15. The system recited in claim 7 wherein the load reduction transfer switch is operative to locally measure electrical load, and automatically transfer selected loads to the secondary power source via the load reduction transfer switch if power demand approaches a threshold.
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16. The system recited in claim 7 which comprises a plurality of load reduction transfer switches that transfer selected loads to the secondary power source.
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17. A method of providing load reduction in a system that supplies power from a primary power source to multiple sets of loads and supplies power from a secondary power source by way of a first transfer switches to a subset of critical loads if power from the primary power source is unavailable, the method comprising the steps of:
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coupling a remotely controllable second transfer switch between the secondary power source and a subset of load reduction loads that are to be disconnected from the primary power source during times requiring load reduction; and
remotely controlling the second load reduction transfer switch to supply power from the secondary power source to the subset of load reduction loads in lieu of supplying power from the primary power source when power from the primary power source is available and during times requiring load reduction. - View Dependent Claims (18)
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19. A method of providing load reduction in a system that supplies power from a primary power source to multiple sets of loads, comprising the steps of:
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coupling a first transfer switch between the primary power source and the loads, and between a secondary power source and a subset of critical loads;
coupling a remotely controllable second transfer switch between the primary power source and the loads, and between the secondary power source and a subset of load reduction loads that are to be removed from the power grid during times requiring load reduction;
remotely controlling the first transfer switch to supply power from the secondary power source to the subset of critical loads if power from the primary power source is unavailable; and
remotely controlling the second load reduction transfer switch to supply power from the secondary power source to the subset of load reduction loads in lieu of supplying power from the primary power source thereto when power from the primary power source is available and during times requiring load reduction. - View Dependent Claims (20)
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Specification