Test specimen for direct-current voltage-resistance performance test of fixed insulation materials under Paschen condition

Abstract

The invention discloses a test specimen for a direct-current voltage-resistance performance test of fixed insulation materials under the Paschen condition, which comprises an insulation support pipe, wherein an insulation layer to be tested covers the insulation support pipe, a connecting sleeve pipe is sleeved outside the insulation layer to be tested, a flange connecting member is sleeved outside the connecting sleeve pipe, a metal covering belt is arranged outside the insulation layer to be tested between the connecting sleeve pipe and the arc-shaped pipe bottom of the insulation support pipe, a tightly collected clamp sleeve is sleeved outside the metal covering belt, and the lower end of the clamp sleeve is electrically grounded through a spring.

Description

technical field [0001] The invention relates to the application field of low-temperature electrophysics, in particular to a sample for testing the withstand voltage performance of a solid insulating material, specifically a sample for testing the DC withstand voltage performance of a fixed insulating material under Paschen conditions. Background technique [0002] Paschen's law describes the nonlinear functional relationship between the gas breakdown voltage and the distance between two electrodes and the gas pressure. The Paschen discharge phenomenon is a gas discharge property, which is closely related to the physical properties of the gas itself. At the same time, the change of the position between the discharge electrodes also has a direct impact on the discharge properties. When the electrode position is fixed, the gas pressure reaches a certain range, and only a very low voltage will cause the discharge phenomenon. At room temperature, Paschen discharge occurs when he...

AI Technical Summary

Problems solved by technology

However, due to the electromagnetic force load and thermal stress of the magnet system, the insulating material may suffer physical damage such as cracking and aging after long-term operation in a low-temperature environment, and the manufacturing process of the insulating material may also have some inherent defects. These unfavorable factors Accumulation will provide the necessary discharge path for Paschen discharge

If insulation defects have already occurred, and a certain degree of vacuum leakage or pipeline helium leakage occurs at the same time, Paschen discharge accidents are likely to occur at this time

Images