Quick measuring device and quick measuring method for space electric fields of liquid dielectric medium

Abstract

The invention discloses a quick measuring device and a quick measuring method for space electric fields of a liquid dielectric medium, and belongs to the technical field of high voltage and insulation measurement. The method is a quick measuring technology for space transient electric fields of a liquid dielectric medium based on an electro-optic Kerr effect and a Mach-Zehnder interferometer. The quick measuring device consists of a He-Ne laser device, a beam expander, a polarizer, a quarter-wave plate, a Kerr box, a transient voltage generator, a polarization splitting prism, a depolarization splitting prism, a total reflective mirror, a half-wave plate, a CCD (charge coupled device) image sensor. The quick measuring method comprises the following steps: firstly, regulating a light path, and directly measuring interference fringes through the CCD image sensor, visually reflecting externally applied electric fields without being limited by back-end detecting equipment, thereby realizing quick measurement for transient electric fields and making up defects of an Kerr effect alternating-current modulating method in the transient electric field measuring filed.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation measurement, and in particular relates to a device and method for rapidly measuring electric field in liquid dielectric space. Specifically, it relates to a fast measurement technique of transient electric field in liquid dielectric space based on electro-optical Kerr effect and Mach-Zehnder interferometer. Background technique [0002] Oil-paper insulation is currently the main form of insulation for large-scale power equipment such as power transformers and converter transformers. The resistivity and permittivity of insulating materials exhibit certain nonlinear characteristics, which makes the electric field of oil-paper insulation structure have certain uncertainty. Therefore, in order to conduct an effective quantitative analysis of the field strength distribution characteristics of oil-paper insulation structures under AC, DC, impact and various impulse voltages, it is u...

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Problems solved by technology

However, due to the limitation of data acquisition equipment, it is difficult to realize the actual measurement of the electric field of oil-paper insulation space under the action of transient voltage such as lightning shock or operation shock, and it can only realize the measurement of a single measuring point, and cannot realize the measurement of an area. Therefore, it is necessary to further carry out research on the rapid measurement technology of the transient electric field in the oil-paper insulation space region

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