Ferroresonance-suppressing static transfer switch
First Claim
1. A ferroresonance-suppressing static transfer switch for connecting and disconnecting a first and a second power source to and from a load, the static transfer switch comprising:
- switch means configured to couple the first and second power source to the load, the switch means including a switch output for coupling the switch means to the load; and
a capacitive voltage divider coupled to the switch means and configured to attenuate the voltage applied to the load when the switch means is open for suppressing series ferroresonance at the load.
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Accused Products
Abstract
A static transfer switch for reducing ferroresonance in a load consisting of a first switch for connecting and disconnecting a primary power source to and from the load, and a second switch for connecting and disconnecting a secondary power source to and from the load. Each switch includes a snubber circuit connected across the respective switch. An attenuator, consisting of a resistor in series with a capacitor, is connected between the first and second switches and ground and suppresses series ferroresonance at the load by reducing the voltage applied to the load when both the first and second switches are open and power is applied to or removed from the load.
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Citations
28 Claims
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1. A ferroresonance-suppressing static transfer switch for connecting and disconnecting a first and a second power source to and from a load, the static transfer switch comprising:
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switch means configured to couple the first and second power source to the load, the switch means including a switch output for coupling the switch means to the load; and
a capacitive voltage divider coupled to the switch means and configured to attenuate the voltage applied to the load when the switch means is open for suppressing series ferroresonance at the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A ferroresonance-suppressing switching system comprising:
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a load transformer;
switch means coupled to the load transformer and configured to couple a first power source and a second power source to the load transformer; and
a capacitive voltage divider coupled to the switch means and the load transformer and configured to attenuate the voltage applied to the load transformer when the switch means is open for suppressing series ferroresonance at the load transformer. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A ferroresonance-suppressing static transfer switch for switching a load between a first and a second power source, comprising:
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switch means configured to couple the first and second power source to the load, the switch means including a first switch input for coupling the switch means to the first power source, a second switch input for coupling the switch means to the second power source, a switch output for coupling the to the load, a first electronic switch electrically in series with the first switch input and the switch output for transferring power between the first power source and the load, and a second electronic switch electrically in series with the second switch input and the switch output for transferring power between the second power source and the load; and
a capacitive voltage divider coupled to the switch means and comprising a first snubber capacitor disposed in parallel with the first electronic switch, electrically in series with the first switch input and the switch output, a second snubber capacitor disposed in parallel with the second electronic switch, electrically in series with the second switch input and the switch output, and an attenuating capacitor coupled to the switch output, electrically in parallel with the load, the attenuating capacitor having a capacitance which is substantially greater than a capacitance of the snubber capacitors. - View Dependent Claims (26)
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27. A ferroresonance-suppressing switching system comprising:
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a load transformer;
switch means coupled to the load transformer and configured to couple a first and a second power source to the load transformer, the switch means including a first switch input for coupling the switch means to the first power source, a second switch input for coupling the switch means to the second power source, a switch output for coupling the switch means to the load transformer, a first electronic switch electrically in series with the first switch input and the switch output for transferring power between the first power source and the load transformer, and a second electronic switch electrically in series with the second switch input and the switch output for transferring power between the second power source and the load transformer; and
a capacitive voltage divider coupled to the switch means and the load transformer and comprising a first snubber capacitor disposed in parallel with the first electronic switch, electrically in series with the first switch input and the switch output, a second snubber capacitor disposed in parallel with the second electronic switch, electrically in series with the second switch input and the switch output, and an attenuating capacitor coupled to the switch output, electrically in parallel with the load transformer, the attenuating capacitor having a capacitance which is substantially greater than a capacitance of the snubber capacitors. - View Dependent Claims (28)
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Specification