SU1567988A1 - Apparatus for measuring current and voltage - Google Patents

Abstract

The invention relates to electrical measuring equipment and can be used in the instrumentation of high voltage circuits. The purpose of the invention is to improve the measurement accuracy and simplify the device. The light of the optical radiation source 1 through the polarization splitting prism 2 enters the spatial optical modulator containing electrohydration crystals 3.1, 3.2 in antiparallel orientation. The output radiation contains information about the intensity of the electric and magnetic fields, which are extracted by the analyzers 4.1, 4.2, photodetectors 5.1, 5.2, and after amplification by measuring amplifiers 6.1, 6.2 blocks of 7.8 summation and subtraction. 1 il.

Description

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The invention relates to electrical measuring equipment and is intended for use in the control and measuring equipment of high voltage electrical circuits.

The purpose of the invention is to simplify the measuring device and improve the measurement accuracy.

The drawing shows a functional diagram of a device for measuring current and voltage.

The device contains an optical radiation source 1 (laser), a polarization splitting prism 2, electrogyration crystals 3.1 and 3.2, for example, cut from one. single-crystal centrosymmetric class and deployed 180 relative to each other, forming a spatial optical modulator, prism analyzers 4.1 and 4.2, photodetectors 5.1 and 5.2, measuring amplifiers 6.1 and 6.2, summation and subtraction blocks 7.8, respectively. Optical fibers (light guides) can be used to deliver the light beam to the electrostatic crystal, as well as to direct the radiation transmitted through the crystal to the photoreceiver. In this case, the input of each of the beams into a separate fiber is carried out after the beam-splitting prism 2 and after the analyzers 4.1; 4.2. In addition, since the state of polarization in the optical fiber is not preserved, the input of the electrochemical crystals is 3.1; 3.2 it is necessary to additionally introduce a polarizer. Analyzers 4.1; 4.2 is set to 50% transmission.

The device works as follows.

Electro gation crystals are placed in the field of a high voltage conductor with measured current or voltage. The optimal condition for measuring the voltage or current values is the parallelism of the power lines of the electric and magnetic fields of the optical axis of the electro-radiation crystal. To ensure this condition, it is sufficient to orient the electroheating crystals with the directions of the optical axes parallel to the magnetic field lines, and to apply the electrical voltage, for example, using ring electrodes attached to the input and output ends of each of the electrogyration crystals. In this case, in the process of measurement, the electric and magnetic fields of the same sign are applied to each of the electrocryption crystals. However so

As the crystals are set in antiparallel orientation, the angles of the Faraday rotation of the polarization plane Cf for the rays in each of the two channels will be the same, and the electrohydration rotation of the SREG in each of the antiparallel crystals will be the same but opposite in sign. Thus, the rotation of the plane of the bone polarization of the beam in each of the channels will be respectively ((+ if9r) and (C), - Cfg). Therefore, analyzers 4.1 have passed; 4.2, the light fluxes will cause on photo detectors 5.1 and 5.2 the appearance of the corresponding sum and difference signals. By amplifying and then the operations of summation and subtraction of the electrical signals of each channel, it is possible to obtain signals proportional to the values of 2n and 2sreg, respectively. Since the magnitude of the Faraday rotation angle is proportional to the magnitude of the current, and the magnitude of the electrohydration rotation

5 - the magnitude of the applied electrical voltage, then the signals obtained at the output of the device, after appropriate calibration, can determine the desired values of current and voltage in the high-voltage conductor.

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Claims (1)

Claims An apparatus for measuring current and a voltage containing an optical radiation source optically coupled through a polarization splitting prism to the first and second inputs of a spatial optical modulator containing two electrohydration single crystals; the first and second outputs of a spatial-optical modulator through the first and second analyzers are optically connected to the inputs the first and second photodetectors, the electrical outputs of which are connected through the first and second measuring amplifiers with 5 15679886 the corresponding inputs of a sum-axis unit connecting the first input and the first and subtractors, the outputs of which the output of the spatial modulators are connected to the output of the device, pa, the main optical axis of the second characterized in that the electrogeneration crystal is intended to simplify the device and is enhanced in the antiparallel measurement accuracy, in the quality direction relative to the main electrohydration crystals of the optical axis of the first electrostimulated crystal, the first and second monocrystals of the centrosymmetric JQ class, the main optical axis is per-connected by faces parallel to their electrolyte crystallaptic optical axis, and form oriented collinear optical monoblock.