Simulation device for operating condition of casing with oil-paper insulation defect

Abstract

The invention relates to an oil-paper insulation defect bushing running condition simulating device. For the influence of different defects on the insulation performance of a capacitor core inside anoil-paper insulation bushing, there is a general lack of effective technical simulation tools, it is not possible to provide reliable evaluation analysis for defective bushing running based on many tests. According to the invention, the device is composed of an inn cavity, an external cavity, an electrode clamping slot and a capacitor core module, wherein a bushing shell is simulated by the innercavity, the external cavity simulates the external environment, the defective capacitor core is installed in the inner cavity and fixed and led out by the electrode clamping slot, and the environmental parameters inside the cavity are controlled by an electric heating belt, a humidifying device, a thermocouple and other accessories installed in the cavity, which provides an experimental platform for simulating operation conditions and detecting state quantities of the oil-paper insulation defect bushing. The device is easy to construct and can meet the needs of repeated operation and measurement in the study of insulation state of a defective bushing, which provides great convenience for workers.

Description

technical field [0001] The invention relates to the technical field of electric power safe operation, in particular to a device for simulating the operating conditions of bushings with oil-paper insulation defects. Background technique [0002] Oil-paper insulating bushing is an important auxiliary safety device for large power transformers. It plays the role of leading high and low voltage leads from the inside of the transformer, realizing the connection between the transformer and the external electrical network and the insulation of the leads from the transformer shell. At present, the most common one in the power grid is the oil-paper insulated capacitive bushing, and its main insulating part is the internal capacitor core. Due to the complex structure and compact design of the oil-paper insulating bushing, it is easy to become the weakest link of the transformer insulation system under the conditions of improper installation design and harsh operating environment. Sta...

AI Technical Summary

Problems solved by technology

Due to the complex structure and compact design of the oil-paper insulating bushing, it is easy to become the weakest link of the transformer insulation system under the conditions of improper installation design and harsh operating environment.

Statistics show that bushing faults account for as high as 35% to 45% of the faults caused by defects in transformer accessories, while oil-paper insulating bushings often have defects caused by internal capacitor core insulation damp, aging, manufacturing process, and poor insulation materials. , these will lead to abnormal insulation performance of the bushing, such as insulation reduction, discharge or even insulation breakdown

There is still a general lack of effective technical simulation means for the impact of insulation performance changes caused by different defects in the capacitor core inside the oil-paper insulating bushing, and it is impossible to provide reliable evaluation and analysis for bushings with defects based on a large number of tests

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