Flat sample space charge distribution measuring apparatus capable of preventing electromagnetic interference and method thereof

Abstract

The invention discloses a flat sample space charge distribution measuring apparatus capable of preventing electromagnetic interference and a method thereof. The measuring apparatus comprises a high-voltage DC power source (1), a high-voltage lead (2), an insulation self-adhesive tape (3), a high-voltage resistor (4), a first waveguide tube (5), a signal shielding case (6), a current-limiting resistor (7), a blocking capacitor (8), a coaxial cable (9), a second waveguide tube (10), a sample shielding case (11), a metal pillar (22), an electrode measuring unit (100), an amplifier (20), a digital oscilloscope (21), a high temperature drying box (24) and a laser (25). According to the invention, the high-voltage lead is led to the signal shielding case through the first waveguide tube, and the signal shielding case is connected to the sample drying box through the second waveguide tube, so that electromagnetic interference by external environment can be effectively prevented; and the middle portion of the high-voltage lead is connected to the high-voltage resistor, so that the electromagnetic interference in the environment can be coupled to a circuit, and the environment electromagnetic interference can be effectively prevented.

Description

technical field [0001] The invention relates to the field of space charge distribution measurement, in particular to a flat sample space charge distribution measurement device and method for preventing electromagnetic interference. Background technique [0002] Electrically insulating materials result in the formation of internal defects due to defects in their molecular structure. Under the action of the electric field, the carriers move along the direction of the electric field. When these carriers encounter the formed defects, they will be trapped by them, forming corresponding space charges. The Coulomb field and the applied electric field formed by these space charges will change the distribution of the original electric field, resulting in serious distortion of the electric field in the material, which will cause the development of the electric tree and lead to the destruction of the insulation. Therefore, space charge seriously affects the performance of electrical i...

AI Technical Summary

Problems solved by technology

The space charge measurement of flat sample based on the pressure wave method, the space charge distribution signal is easily disturbed, and the signal attenuation is relatively large, especially the high-voltage lead wire and coaxial cable are easy to introduce external electromagnetic interference, resulting in a low signal-to-noise ratio of the measurement system and inaccurate measurement

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