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US 2022/0285930 A1Published application
Transformer rectifier unit power quality protection
AssigneeHamilton Sundstrand Corporation
InventorRobert L. Seagren
Life of this patent
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AssigneeHamilton Sundstrand Corporation
InventorRobert L. Seagren
Estimating the term…
A system includes a transformer rectifier unit (TRU) having three inputs, a first AC bus configured to supply power to a first of the three inputs, a second AC bus configured to supply power to a second of the three inputs, and a third AC bus configured to supply power to a third of the three inputs. The system includes a power quality sense device electrically connected to each of the first, second and third AC busses. The system includes an electrically held contactor electrically connected between the TRU and the power quality sense device. The electrically held contactor is configured and adapted to be switched ON or OFF depending on whether the power quality sense device is energized or de-energized.
A system comprising:
The system as recited in claim , wherein the power quality sense device is configured to be energized if the power quality across the AC busses is within a selected acceptable range.
The system as recited in claim , wherein the electrically held contactor is switched ON when the power quality sense device is energized.
The system as recited in claim , wherein the power quality sense device is configured to be de-energized if the power quality across the AC busses is outside of a selected acceptable range.
The system as recited in claim , wherein the electrically held contactor is switched OFF when the power quality sense device is energized.
The system as recited in claim , further comprising a DC bus electrically connected to the electrically held contactor, wherein the electrically held contactor is between the output of the TRU and the DC bus.
The system as recited in claim , further comprising a 28V power supply electrically connected in series to the electrically held contactor.
The system as recited in claim , wherein the power quality sense device is configured and adapted to sense frequency and current of at least one of the first, second or third AC busses.
The system as recited in claim , further comprising respective overcurrent protectors on the first, second and third AC busses.
The system as recited in claim , wherein the power quality sense device is electrically connected to each of the first, second and third AC busses at respective sense points between the respective overcurrent protectors and the three inputs of the TRU.
A method of power quality detection comprising:
Dependencies are inferred from the claim text.