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US 5,777,833 AGranted
Electronic relay for calculating the power of a multiphase electric load based on a rectified wave signal and a phase current
AssigneeSchneider Electric SA
InventorJean-Marc Romillon
Life of this patent
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Abstract
An electronic relay having a current sensor device (C1, C2, C3), logic inputs (3) and an electronic circuit (4) provided with processing means capable of calculating, from the current signal (I) supplied by the current sensor device and a rectified voltage signal (V) supplied by one of the logic inputs, the value of the power factor of the motor (cos.phi.) and/or the value of the power supply voltage (U) of the motor.
Claims7
An electronic relay for a multiphase electric load, said electronic relay comprising:
- a plurality of sensor devices that supply a phase current for each phase;
- a threshold voltage rectifying circuit that receives an alternating supply signal and outputs a rectified signal having a period, a minimum voltage condition, and a maximum voltage condition;
- and
- a microcontroller circuit that calculates a power factor or a power supply voltage that is a function of
- at least one of the phase currents and
- the period of the rectified signal.
3 more elements
Dependencies are inferred from the claim text.