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US 12,744,374 B2Granted
Systems and methods for breaker operation in power systems
AssigneeDoosan Bobcat North America, Inc.
InventorsBrandon Ahrens, John Freeman, Ctibor Baláš, Jaromir Nusl
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Abstract
Systems and methods are provided for controlling breaker operation of power systems during a close before excitation (CBE) operation. One method includes closing the breaker of a generator prior to alternator voltage excitation, using power sourced from a permanent magnetic generator (PMG) that is coupled to the alternator.
Claims16
A generator system comprising:
- an alternator coupled to an engine and configured to provide a main voltage output to an external load;
- a permanent magnetic generator (PMG) coupled to the alternator;
- a breaker configured to open and close a connection with the external load;
- a first breaker control relay coupled to the breaker to control operation of the breaker;
- a second breaker control relay coupled to the breaker to control operation of the breaker;
- and
- a controller communicatively coupled to the first breaker control relay, the controller configured to:
- generate and transmit a first control signal to the first breaker control relay, wherein the first control signal causes the first breaker control relay to provide power from the PMG to close the breaker;
- and
- generate and transmit a second control signal to the second breaker control rely, wherein the second control signal causes the second breaker control relay to provide power from the main voltage output from the alternator to the breaker to cause the breaker to open.
7 more elements
A method for controlling a breaker of a generator, the method comprising:
- powering an alternator of the generator with an engine;
- with the generator powered by the engine, closing the breaker of the generator using power sourced, via a first breaker control relay coupled to the breaker and configured to provide power to the breaker, from a permanent magnetic generator (PMG) of the alternator, wherein a controller of the generator is configured to generate and transmit a first control signal to the first breaker control relay, wherein, responsive to receipt of the first control signal, the first breaker control relay provides the power from the PMG to the breaker to cause the breaker to close;
- and
- after closing the breaker, causing voltage excitation at the alternator, to power an external load across the breaker.
1 more element
A generator system comprising:
- an alternator coupled to an engine and configured to provide a main voltage output to an external load;
- a permanent magnetic generator (PMG) coupled to the alternator;
- a breaker configured to open and close a connection with the external load;
- a first breaker control relay coupled to the breaker to control operation of the breaker;
- a second breaker control relay coupled to the breaker to control operation of the breaker;
- and
- a controller communicatively coupled to the breaker control relay, the controller configured to generate and transmit a first control signal to the first breaker control relay, wherein the first control signal causes the first breaker control relay to provide power from the PMG to close the breaker;
- wherein, after the breaker is closed, the alternator is configured to receive an excitation voltage such that power is provided to the external load;
- and
- wherein, after the alternator receives the excitation voltage, the controller is configured to generate and transmit a second control signal to the second breaker control relay, and wherein, responsive to the second control signal the second breaker control relay provides power to the breaker to open the breaker.
7 more elements
Dependencies are inferred from the claim text.