Light path structure of paper oil insulation space electric field measurement and adjusting method thereof

Abstract

The invention discloses a light path structure of paper oil insulation space electric field measurement and an adjusting method thereof, belonging to the technical field of optical electric field measurement of high voltage insulation. The light path structure is composed of a helium-neon laser, an opto-isolator, a polarizer, a quarter-wave plate, a Kerr-cell, an analyzer and a photoelectric detector; auxiliary optical devices also comprise a micropore diaphragm, a polarized beam splitter and an optical power meter. The angle of the optical device in the light path structure is calibrated and the direction thereof is adjusted, the helium-neon laser is firstly fixed on an optical table, and then the micropore diaphragm is used for adjusting the height and direction of the helium-neon laser; then the angle of each optical device is calibrated and the direction thereof is adjusted according to the light path structure. The invention can effectively prevent the interference of the specular reflection beam of the optical device to the output intensity of the laser, improve the measurement accuracy, effectively guarantee the repeatability and reliability of each experiment, simplify the experiment process, besides, the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of optical electric field measurement of high-voltage insulation, and in particular relates to an optical path structure and an adjustment method for oil-paper insulation space electric field measurement. Background technique [0002] High-voltage direct current transmission (HVDC) technology started in the 1950s, and has developed rapidly because of its unique advantages in long-distance large-capacity power transmission, cross-sea power transmission, and grid connection. With the development of DC transmission projects, the reliability of the DC transmission system is increasingly important to the safe operation of the power grid and the national economy. However, a large number of statistics show that the primary winding equipment represented by the converter transformer is the main cause of the forced outage of the DC system. One of the factors, the insulation problem of DC equipment has always been the ...

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Problems solved by technology

[0006] However, there is a problem with the AC modulation technology: since most optical devices require the laser incident angle to be as small as possible, the mirrors of the optical devices are placed perpendicular to the beam as much as possible, so that the beam containing the higher frequency AC modulation component is mirrored on the surface of the optical device Reflection, the reflected beam is incident into the resonant cavity of the laser, causing violent fluctuations of the light source, and the output light intensity contains additional noise of the AC modulation frequency, which causes the performance of the measurement system to deteriorate, seriously affecting the accuracy and reliability of the measurement results

[0008] In view of the above problems, the current research of related technologies has not proposed an optical path structure that can effectively reduce the influence of reflected light beams on the accuracy of electric field measurement, nor has a set of systematic and complete optical path adjustment and calibration methods been proposed.

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