A method for damp test of bushing inner insulation under impact load

Abstract

The invention discloses a method for testing the dampness of the bushing inner insulation under an impact load. Due to the impact of the traction load, there is an obvious difference between the moisture distribution of the main insulation of the traction transformer bushing and the distribution of the insulation moisture of the ordinary power transformer bushing. The effective evaluation of the damp state of the main insulation of the bushing has brought a great impact. According to the experimental method provided by the present invention, the transient distribution state of the casing insulation moisture under the impact load can be simulated, and the casing insulation moisture distribution can be obtained when the moisture is transiently distributed. frequency-domain dielectric spectrum.

Description

technical field [0001] The invention belongs to the field of bushing insulation state evaluation, and in particular relates to a method for the damp test of bushing inner insulation under impact load. Background technique [0002] The bushing is an important accessory device of the traction transformer, and its insulation status is of great significance to the safe and reliable operation of the transformer. During service, traction transformer bushings have been tested by multiple factors such as electricity, moisture, heat, and mechanical stress for a long time, resulting in continuous deterioration of its insulation state. Therefore, long-term and effective monitoring of its insulation state is required during operation. At present, the frequency-domain dielectric spectrum method based on the dielectric response theory has been widely used in the field of bushing insulation status evaluation due to its wide measurement frequency band, rich insulation information, strong an...

AI Technical Summary

Problems solved by technology

[0003] The traction load is impactful, which causes a significant difference in the moisture distribution of the main insulation of traction transformer bushings and that of ordinary power transformer bushings, which has a great impact on the effective evaluation of the damp state of the main insulation of traction transformer bushings.

However, in actual engineering, the moisture distribution in the oil-paper insulation of oil-immersed casing is always changing dynamically under the action of impact load. The existing frequency-domain dielectric response test method takes a long time to test the low-frequency part, and cannot Effectively obtain the frequency-domain dielectric spectrum of the transient distribution of moisture in the bushing insulation under the impact load, and then it is impossible to study the evaluation of the damp state of the main insulation of the bushing under the impact load, so there is an urgent need for a method for the damp test of the inner insulation of the bushing under the impact load

Images