SU1571516A1 - Apparatus for non-contact transmission of constant voltages and currents in high-voltage conductor - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase reliability, accuracy and noise immunity. The device contains a thermal protection element 1, a gas indicator 2, a high-resistance and high-voltage resistor 3, a low-resistance current shunt 4, a current-frequency converter 5, LEDs 6 and 12, light-guides 7 and 13, a voltage divider 8 with low-resistance and high-resistance parts 9 and 10, voltage converter 11 - frequency, stabilized power source, consisting of power sources 14, 15, protective transformer 16, thermal protection 17, transformer 18, indicator 19, fuse 20. Application of current-frequency and voltage in a high-voltage converter conductor s - frequency for converting current and voltage values into frequency values of light pulses in the long-wave infrared region and then transmitting them along separate light-guide channels improves accuracy, improves linearity of conversion in the O – V _max and O – J _max ranges, and also ensures noise immunity of the transmission current and voltage information, which, in addition to simplifying the circuit while improving its power supply, distinguishes the proposed device from the prototype. 1 il.

Description

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The invention relates to electrical engineering and can be used for contactless transmission in order to measure constant (pulsating) voltages and currents from zero to as high as possible in a high-voltage conductor.

The purpose of the invention is to improve the reliability and accuracy of noise with

The device (Fig „1) contains a thermal protection element 1 with a gas indicator 2, the current of which limits the high-resistance and high-voltage resistor 3, a low-resistance current shunt 4 connected to the input of the converter 5 current-frequency, at the input of which the LED is turned on-6, coupled with optical fiber 7, voltage divider 8 with low-resistance 9 and high-resistance 10 parts, voltage converter 11 — frequency connected to low-resistance part 9 of voltage divider 8, the output of which includes LED 12 coupled to light guide 13, stabilized power sources 14, 15 connected to the secondary identical windings of the protective transformer 16, the primary winding of which is grounded at one end and the other through thermal protection 17 is connected to the ungrounded end of the secondary winding of the transformer 18 with indicator 19 and a fuse 20 that reduces the supply voltage to a safe level . The arrangement of the component parts of the device with the designations in FIG. 1 is shown in the general form of the design in FIG. 2, where 21 is a high-voltage, high-power source, and 22 is the load.

The input current supplied to the load 22 (FIG. 2) from a high-voltage high-power source 21 (FIG. 2) passes through thermal protection 1 (FIG. 1) and a low-current current shunt 4. The current is converted by the converter 5 into the frequency of light pulses LED 6, which emits light into the fiber 7 in the long-wave infrared region. The conversion error is determined not by the shunt, but only by the accuracy and linearity of the current conversion by the converter 5, which provides conversion error with J value, 0.01% 0 Very small fraction of the high volt voltage

applied to the load 22 (Fig. 2) is removed from the non-ohmic part 9 (Fig. 01) of the voltage divider 8 and converted by the converter 11 to the frequency of the light pulses by means of the LED 12, which is emitted. It emits light into the optical fiber 13 in the long-wave infrared region. The conversion error for voltage is equal to the sum of the error created by converter 11, with a value of 0.01%, and the error depending on the measurement accuracy of the high5 ohm resistor 10 of the voltage divider 8, value, 05%, i.e. the total conversion error for voltage is 2 Ј S + 0 0.06%. The converters are supplied with stabilized sources 14, 15 by a reduced mains voltage from transformer 18 with the necessary switching on of indicator 19 and fuse 20 through a protective transformer of 16 small sizes and low weight, protecting the network from high voltage. the primary winding of which is terminator at one end is necessarily grounded, and the other is connected through the obligatory thermal protection 17 to the secondary winding of the transformer 18 "

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Thus, the use of current-frequency and voltage-frequency converters in a high-voltage conductor for converting the values of currents and voltages to the frequencies of light pulses in the long-wave infrared region and then transmitting them along separate light-conducting channels improves accuracy and improves the linearity of the conversion. in the range of 0-Vmax and 0-1, and also provides noise immunity for the transmission of current and voltage information, which, in addition to simplifying the circuit while improving its power supply, distinguishes the proposed device ystvo the prototype of

Claims (1)

Invention Formula A device for contactless transmission of DC voltages and currents in a high-voltage conductor, containing a voltage divider with a low-resistance part, current-frequency and voltage-frequency converters, frequency, optical fibers with LEDs, sequentially connected gas indicator, high-resistance resistor, connected With a low impedance shunt and device output, and a stabilized power source, characterized in that, in order to increase reliability, increase accuracy and noise immunity, to a low impedance shunt and low impedance part 571516 the voltage connects the current – frequency and voltage – frequency converter inputs to the anodes of the LEDs whose cathodes are connected to the first output of the stabilized power source, and the converter inputs are connected to the second and third outputs of the stabilized power source. UUCHUUHD HU HU CHS1JUCH ZHUi1 Wyhllmlhhhhllll