Retrofit kit for converting a transfer switch to a switch for soft-load transfer, and soft-load power distribution system and method
First Claim
1. A retrofit kit for converting a transfer switch to a switch for soft-load transfer, said transfer switch including a first input to a first power source having a first alternating current voltage, a second input to a second power source having a second alternating current voltage, an output to a load, a first switch electrically connected between said first input and said output, a second switch electrically connected between said second input and said output, and a third input controlling said first and second switches, said retrofit kit comprising:
- a third switch adapted to be electrically connected between said second input and said output;
a first sensor adapted to sense the first alternating current voltage at said first input;
a second sensor adapted to sense the second alternating current voltage at said second input; and
a controller adapted to close said third switch when said first alternating current voltage is within a predetermined range of said second alternating current voltage, said controller including an output adapted to be electrically connected to the third input of said transfer switch.
1 Assignment
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Accused Products
Abstract
A soft-load power distribution system includes a transfer switch having a first input to a utility power source with a utility alternating current (AC) voltage, a second input to a generator power source with a generator AC voltage, and an output to a load. A first switch is electrically connected between the first input and the output and a second switch is electrically connected between the second input and the output. The transfer switch has a third input, such as a go to emergency input, controlling the first and second switches. A bypass switch is electrically connected between the second input and the output. First and second sensors, such as potential transformers, sense the utility and generator AC voltages, respectively. A controller closes the bypass switch when the utility AC voltage is within a predetermined range of the generator AC voltage, and includes an output controlling the third input.
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Citations
22 Claims
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1. A retrofit kit for converting a transfer switch to a switch for soft-load transfer, said transfer switch including a first input to a first power source having a first alternating current voltage, a second input to a second power source having a second alternating current voltage, an output to a load, a first switch electrically connected between said first input and said output, a second switch electrically connected between said second input and said output, and a third input controlling said first and second switches, said retrofit kit comprising:
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a third switch adapted to be electrically connected between said second input and said output;
a first sensor adapted to sense the first alternating current voltage at said first input;
a second sensor adapted to sense the second alternating current voltage at said second input; and
a controller adapted to close said third switch when said first alternating current voltage is within a predetermined range of said second alternating current voltage, said controller including an output adapted to be electrically connected to the third input of said transfer switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A soft-load power distribution system comprising:
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a transfer switch comprising;
a first input to a first power source having a first alternating current voltage, a second input to a second power source having a second alternating current voltage, an output to a load, a first switch electrically connected between said first input and said output, a second switch electrically connected between said second input and said output, and a third input controlling said first and second switches;
a third switch electrically connected between said second input and said output;
a first sensor sensing the first alternating current voltage at said first input;
a second sensor sensing the second alternating current voltage at said second input; and
a controller closing said third switch when said first alternating current voltage is within a predetermined range of said second alternating current voltage, said controller including an output electrically connected to the third input of said transfer switch. - View Dependent Claims (13, 14, 15)
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16. A method of providing a soft-load from a transfer switch, said method comprising:
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employing said transfer switch including a first input to a first power source having a first alternating current voltage, a second input to a second power source having a second alternating current voltage, an output to a load, a first switch electrically connected between said first input and said output, a second switch electrically connected between said second input and said output, and a third input controlling said first and second switches;
electrically connecting a third switch between said second input and said output;
sensing the first alternating current voltage at said first input;
sensing the second alternating current voltage at said second input;
electrically connecting an output to the third input of said transfer switch; and
closing said third switch when said first alternating current voltage is within a predetermined range of said second alternating current voltage, in order to parallel the first and second alternating current voltages, which provide power to the load. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification