OPTICAL-ELECTRONIC CURRENT AND VOLTAGE SENSOR Russian patent published in 2017 - IPC G01R19/00 

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering, specifically to current and voltage sensors. Disclosed is an optical-electronic current and voltage sensor, in which there is a primary converter, an encoding unit, a communication channel between high voltage side and earth potential, a receiving unit and a power supply unit in form of a channel for transmitting energy from earth potential side, consisting of a battery of light emitters, power optical channels, battery of photodetectors and a voltage stabilizer. Additionally, primary converter for current used is a shunt, which is connected across power transmission line. For voltage, a resistive voltage divider is used, consisting of a low-ohmic resistor, one end connected to power transmission line wire, and other to a group of series-connected high-ohmic resistors. Latter of which is attached to a traverse power transmission line, encoding unit is made in form of two analogue-to-digital converters (ADC), input of first ADC is connected to shunt, input of second ADC is connected to low-ohmic resistor, common point of connection of ADC is connection point of shunt and low-ohmic resistor. ADC outputs are connected to inputs of converters for converting parallel digital code into a serial code, to which are connected emitting light-emitting diodes, which supply light signals to fibre-optic communication channels, other ends of which are connected to corresponding receiving units. Technical result is achieved by simultaneously converting and transmitting current and voltage signal with high accuracy with a large number of samples per period and obtaining signals of partial discharges of each insulator of overhead transmission lines for diagnosis thereof.

EFFECT: reduced error of measured values of current and voltage, possibility to transmit measured signal to a control station, as well as possibility of picking up a signal with a frequency spectrum available in a network including high frequencies, which is impossible to do with traditional electromagnetic transformers.

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