High-vacuum solid insulation surface charge measuring probe control system

Abstract

The invention discloses a high-vacuum solid insulation surface charge measuring probe control system and belongs to the field of electrostatic measurement. The measuring probe control system comprises an electrostatic capacitor probe bracket comprising a probe sliding track and a slope support, an electrostatic capacitor probe movement control mechanism comprising a spring mechanism and a pull-down connecting rod as well as a high-vacuum system, wherein in the high-vacuum system, a to-be-measured solid insulation test object is placed between a high-voltage electrode and a ground electrode; the pull-down connecting rod is in dynamic seal fixation with a bottom plate of the high-vacuum system through a magnetic fluid. An electrostatic capacitor probe is controlled to be away from or get close to the solid insulation test object by the aid of mechanical drive control components such as the spring mechanism, the pull-down connecting rod, a rotating shaft, a gear mechanism and the like, and the distance between the electrostatic capacitor probe and the solid insulation surface is kept constant by means of the slope support; high-vacuum dynamic seal is realized by the aid of a magnetic fluid sealing technology, control movement outside a vacuum testing cavity is transferred into the cavity, and meanwhile, the vacuum degree is not affected.

Description

technical field [0001] The invention belongs to the category of static electricity measurement, and in particular relates to a control system for a high-vacuum solid insulation surface charge measurement probe. Background technique [0002] The interface between vacuum and solid insulation is the weakest link of the entire insulation system. The surface charge accumulation at the vacuum-solid insulation interface will change the electric field distribution of the insulation system, and then affect the creepage withstand voltage level of the insulation system. Therefore, the measurement of the surface charge of vacuum solid insulation is of great significance. [0003] The measurement of surface charge belongs to the category of electrostatic measurement, so it cannot be measured with common electrical instruments. The measurement methods of surface charge mainly include: dust method, electroacoustic pulse method, ultrasonic method, Pockels effect method, capacitance probe ...

AI Technical Summary

Problems solved by technology

In order to ensure the measurement resolution, the capacitance value of the probe itself and the entrance capacitance value of the test line in the dynamic capacitance probe method are required to be extremely stable, which is difficult to achieve

In addition, this method is not suitable for the measurement of insulators with complex shapes

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