OPTICAL MULTICHANNEL CURRENT METER FOR HIGH-VOLTAGE NETWORKS Russian patent published in 2024 - IPC G01R15/24 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring instruments for measuring current in high-voltage networks, and more specifically to current meters in which the optical Faraday effect is used. Proposed multichannel optical current meter for high-voltage networks consists of accurate and coarse optical channels in the form of two Faraday cells and five electronic channels. In each optical channel the second polarisers are made in the form of Wollaston prisms, polarization planes of linearly polarized beams separated by them make angles of ±45° with transmission planes of first polarisers, in focal planes of light-collecting lenses there are ends of additional fibre light guides, which transmit light to additional photodetectors. Magnetosensitive element of the coarse channel is also made in the form of a glass prism BP-180°, but from glass with a smaller Verdet constant compared to the glass of the prism of the fine channel. In the electronic unit of the coarse channel there is an adder of signals of photodetectors to form a constant component of the signal. Adder inputs are connected directly to coarse channel preamplifiers, and its output is connected to inputs of an additional microprocessor connected to a clock pulse generator to control the moment and number of current measurements during the period of AC oscillation of the network.

EFFECT: significant increase in measurement accuracy, due to which the coarse channel can be used as a backup for commercial metering, as well as for accurate pulse measurements of impact current and aperiodic component at short circuit; in addition, use of Wollaston prisms as second polarisers 12 and 22 made it possible to have two electronic channels for processing signals of photodetectors in a precise optical channel and four electrical channels in a coarse optical channel; proposed device will find wide application in electric power industry, especially in networks of 110 kV and higher.

1 cl, 5 dwg