System used for measuring internal space charges of oil paper insulating material

Abstract

The invention discloses a system used for measuring internal space charges of an oil paper insulating material. The system comprises an upper electrode system body and a lower electrode system. The upper electrode system body comprises an upper electrode, a direct-current high-pressure source and an impulse source. The lower electrode system body comprises a lower electrode, a piezoelectric sensor and a wide-band amplifier. According to the system, due to a sealing ring and an exhaust module, consistency of features such as the temperature and the micro-water content of a tested object can be ensured in the process of measuring distribution of the internal space charges of the oil paper insulating material; the phenomenon that water is absorbed from air in the process of measuring the space charges and changes of the micro-water content in the tested object can be avoided mainly; in additional, the upper electrode system body is a whole with the fixed weight, on the premise that the thickness of the tested object is uniform, stress on the tested object can be uniform, the problem that due to the fact that the upper electrode system body is fixed manually in an existing measuring system, the pressure is not uniform, and deviation of the measured result occurs can be solved, so that the measured result is more accurate.

Description

【Technical field】 [0001] The invention belongs to the technical field of high voltage and insulation, and in particular relates to a system for measuring space charge inside an oil-paper insulating material. 【Background technique】 [0002] Space charge measurement technology is the basis and means for studying the charge characteristics of materials. The continuous development of space charge measurement technology is closely related to and mutually promotes the continuous deepening of the research on the dielectric properties of dielectric materials. In the existing non-destructive measurement technology of space charge inside oil-paper insulation materials, the pulse electroacoustic method (PEA) has become a very effective, simple and widely used method in the field of measurement. However, in the currently used measurement system, the test object is exposed to the air or in a simple container, which cannot be sealed or completely dried, and the oil-paper insulating materi...

AI Technical Summary

Problems solved by technology

However, in the currently used measurement system, the test object is exposed to the air or in a simple container, which cannot be sealed or completely dried, and the oil-paper insulation material is very easy to absorb moisture from the air, resulting in an increase in the internal micro-moisture content

The increase of moisture content will not only reduce the electrical strength of the oil-paper insulation material, but also accelerate the aging of the oil-paper insulation, shorten the insulation life, affect the conductivity and space charge migration rate of the test product, and affect the accumulation and dissipation characteristics of the space charge inside the test product. significantly

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