Automatic transfer switch for three-phase applications
First Claim
1. A three phase to single phase automatic transfer switch for providing power to at least one single phase power load from one of a primary and a secondary source of three phase power, the automatic transfer switch comprising:
- a. three pairs of switches, wherein each pair of switches is connectable to the primary and the secondary sources of three phase power, wherein each switch operates in unison with the other switch within its pair, wherein each pair of switches is connectable to a different one of the at least one single phase power load, and wherein each pair of switches is operable independently of the other pairs of switches; and
b. one or more controller in communication with each of the pairs of switches, the controller configured so that, when power from the primary source of three phase power is lost or degraded, the controller connects each pair of switches independently of each of the other pairs of switches from the primary to the secondary source of three phase power.
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Accused Products
Abstract
A three phase to single phase automatic transfer switch for providing power to at least one single phase power load from one of a primary and a secondary source of three phase power. The automatic transfer switch includes three pairs of switches, wherein each pair of switches is connectable to the primary and the secondary sources of three phase power, wherein each switch operates in unison with the other switch within its pair, wherein each pair of switches is connectable to a different one of the at least one single phase power load, and wherein each pair of switches is operable independently of the other pairs of switches. The three phase to single phase automatic transfer switch also includes one or more controller in communication with each of the pairs of switches, the controller configured so that, when power from the primary source of three phase power is lost or degraded, the controller connects each pair of switches independently of each of the other pairs of switches from the primary to the secondary source of three phase power.
68 Citations
17 Claims
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1. A three phase to single phase automatic transfer switch for providing power to at least one single phase power load from one of a primary and a secondary source of three phase power, the automatic transfer switch comprising:
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a. three pairs of switches, wherein each pair of switches is connectable to the primary and the secondary sources of three phase power, wherein each switch operates in unison with the other switch within its pair, wherein each pair of switches is connectable to a different one of the at least one single phase power load, and wherein each pair of switches is operable independently of the other pairs of switches; and b. one or more controller in communication with each of the pairs of switches, the controller configured so that, when power from the primary source of three phase power is lost or degraded, the controller connects each pair of switches independently of each of the other pairs of switches from the primary to the secondary source of three phase power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A three phase to single phase automatic transfer switch for providing power from one of two alternative three phase power sources to single phase power loads, each of the three phase power sources having at least three conductors, the automatic transfer switch comprising:
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a. three pairs of switches all connectable to either one of the two alternative three phase power sources, each switch operable in unison with the other switch within its pair, each pair of switches connectable to a different single phase load and operable independently of the other pairs of switches; b. each of the switches having two input contacts and a toggle, the toggle normally connected to one of the input contacts, each input contact within a switch connectable to a conductor of one of the two alternative three phase power sources and the other input contact within a switch connectable to a conductor of the other of the two alternative three phase power sources and the toggle being connectable to at least one of the single phase power loads; and c. one or more controller communicating with the pairs of switches, the controller configured so that when power from a connected one of the two alternative three phase power sources is lost or degrades, the controller simultaneously flips the toggles in each switch pair from the connected to the previously unconnected contact independently of the other pairs of switches such that power is drawn from the other of the two alternative three phase power sources. - View Dependent Claims (9, 10, 11, 12)
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13. A method of switching between a primary and a secondary three-phase power source, each of the primary and secondary three-phase power sources including at least three conductors, the method comprising the steps of:
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providing three pairs of switches, each pair of switches including a set of first contacts, a set of second contacts, and a set of toggles, wherein each of the toggles is normally connected to a first contact and is switchable between the first contact and a second contact; connecting the set of first contacts of each pair of switches to the primary three-phase power source; connecting the set of second contacts of each pair of switches to the secondary three-phase power source; connecting the set of toggles of at least one pair of the three pairs of switches to a single-phase load; monitoring power on the conductors of the primary three-phase power source; and if the power on at least one of the conductors of the primary power source is lost or degraded, switching the set of toggles of at least one of the pairs of switches from the set of first contacts to the set of second contacts. - View Dependent Claims (14, 15, 16, 17)
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Specification