OPTICAL MEASUREMENT OF VARIABLE AND CONSTANT CURRENTS IN HIGH-VOLTAGE NETWORKS Russian patent published in 2018 - IPC G01R15/24 

FIELD: instrument engineering.

SUBSTANCE: invention relates to optical instrumentation, or more precisely to optical polarization devices, in which the Faraday effect is used. Invention will be used in the electric power industry, for example in high-voltage networks of various classes, digital substations and other electrical installations. Proposed device comprises a light source, a multimode optical fiber, a Faraday cell, a second multimode fiber, a photodetector, an electronic unit with an indicator of measurement results. For measurement of alternating and direct current, the first polarizer of the Faraday cell is made in the form of a Wollaston prism, the second polarizer is made as a ring from a polaroid film. Outgoing from the Wollaston prism, the rays pass through the inner opening of the second polarizer. Active element of the Faraday cell is made in the form of an optical glass cylinder with polished bases. On one of the bases is a mirror coating. Double-transmitted polarized light beams pass through a second polarizer whose transmission plane is at an angle ±45° with respect to the transmission planes of the first polarizer. After the second polarizer, two light-gathering lenses, two multimode optical fibers, two photodetectors, and also two linear photodetector amplifiers are installed in the two bunches separated by the Wollaston prism. As an embodiment, the high voltage line conductor fragment consists of a set of parallel conductors connected in parallel, made in the form of a solenoid that covers the Faraday cell cylinder and contains n turns where 1≤n≤6.

EFFECT: thanks to the presence of the Wollaston prism, the proposed device is universal, that is, it measures alternating or direct current.

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