Method for intra-bushing insulation wetting experiment under impact load

Abstract

The invention discloses a method for an intra-bushing insulation wetting experiment under impact load. Because traction load has the impact, the obvious difference exists in the major insulation moisture distribution of a traction transformer bushing and the insulation moisture distribution of a common power transformer bushing, and the effective evaluation for the major insulation wetting state of the traction transformer bushing is greatly affected. According to the provided experiment method, the insulation moisture transient distribution state of the bushing under the impact load can be simulated, and a frequency domain dielectric spectrum of the bushing insulation in the moisture transient distribution state can be obtained.

Description

technical field [0001] The invention belongs to the field of bushing insulation state evaluation, and in particular relates to a method for testing the dampness of the 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...

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

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