CONTACTLESS CONTROL DEVICE OF ALTERNATING CURRENT ELECTRICAL UNITS Russian patent published in 2017 - IPC G01R31/28 

FIELD: electricity.

SUBSTANCE: device includes: a tensity sensor of the external magnetic field, located near the object to be controlled, the output of which is connected to the amplifier input; the narrow-band filter tuned to the frequency 2ω (ω - frequency of alternating voltage, suppling the object), the output of which is connected to the two inputs of the logic unit comparators, having different levels of operation. At that, the comparator output, having a smaller response level, is connected to the logic elements inputs AND-NO and AND. The second input of logic element AND-NO is connected to the comparator output with high response level and the second indicator of indicating unit, and the output of logic element AND- NO is connected to a second input of the logic element AND, to the output of which the first indicator is connected. Wherein the tensity sensor is in the form of three identical orthogonally placed cylindrical windings, initial terminals of which are connected together and grounded, and the end terminal are connected respectively to the amplifiers, each of which is connected to its quad, which outputs are connected to the inputs of the summation unit, and the output of the summation unit is connected to the square root extractor, which is connected to the integrator, which output in its turn is connected to the input of the bandpass filter.

EFFECT: increase of the device reliability.

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