Control of electric loads during generator failure in a multi-generator system
First Claim
1. An electrical power system for controlling electrical loads during a generator failure in a multi-generator system, comprising:
- temperature sensing means for providing temperature signals each indicative of the temperature of a generator critical hotspot for a corresponding operating generator,said generator critical hotspot being indicative of the generator internal component whose temperature first reaches its thermal limit in response to increasing generator load; and
processing means responsive to one of said temperature signals being in excess of a corresponding temperature limit for shedding electrical loads.
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Accused Products
Abstract
In response to the loss of a generator in an electrical power system, all operating electrical loads are automatically switched to a second generator, and the electric power system continues to provide power to all of the loads. The total power required to operate all operating loads is permitted to exceed the nominal rated capacity of the operating generator, and the winding temperature or other critical hotspot temperature of the operating generator is monitored to determine whether thermal stress limits will be exceeded. If the critical hotspot temperature approaches the thermal stress limit, certain electrical loads are disconnected via a pre-programmed load shed priority schedule, and thereafter loads are re-connected as other loads are de-energized or if the critical hotspot temperature decreases.
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Citations
22 Claims
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1. An electrical power system for controlling electrical loads during a generator failure in a multi-generator system, comprising:
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temperature sensing means for providing temperature signals each indicative of the temperature of a generator critical hotspot for a corresponding operating generator, said generator critical hotspot being indicative of the generator internal component whose temperature first reaches its thermal limit in response to increasing generator load; and processing means responsive to one of said temperature signals being in excess of a corresponding temperature limit for shedding electrical loads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrical power system comprising:
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at least two generators; means for providing a generator trip signal in response to a generator failure; temperature sensing means for providing temperature signals each indicative of the temperature of a generator critical hotspot for a corresponding operating generator, said generator critical hotspot being indicative of the generator internal component whose temperature first reaches its thermal limit in response to increasing generator load; means responsive to said temperature signals for providing rate signals indicative of the rate of increase of said temperature signals; and processing means responsive to said generator trip signal for powering all operating electrical loads from operating generators and responsive to one of said rate signals being in excess of a maximum allowable rate for shedding electrical loads. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for controlling electrical loads during a generator failure in a multi-generator system, comprising the steps of:
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providing a generator trip signal in response to a generator failure; providing temperature signals each indicative of the temperature of a generator critical hotspot for a corresponding operating generator, said generator critical hotspot being indicative of the generator internal component whose temperature first reaches its thermal limit in response to increasing generator load; powering all operating electrical loads from operating generators in response to said generator trip signal; and shedding electrical loads in response to one of said temperature signals being in excess of a corresponding temperature limit. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification