Experimental device and sampling method for combined electric heating and aging of transformer copper oil paper system

Abstract

The invention provides an electric and thermal combined aging experimental device for a transformer copper-oil-paper system and an electric and thermal combined aging experimental sampling method fora transformer copper-oil-paper system. The experimental device comprises a main oil tank, an auxiliary oil tank, a high-voltage electrode, a heating device, a mechanical arm, an oil pump, a pressure relief valve and an oil passage; the high-voltage electrode includes an upper electrode and a lower electrode; a channel which extends vertically downwards is formed in one side of the bottom of the main oil tank; an oil draining valve is installed at the bottom of the channel; a paper-clad copper sample is arranged between the upper electrode and the lower electrode; the upper electrode can move up and down; when sampling is performed, the mechanical arm can be adopted to pick up the paper-clad copper sample at the surface of the lower electrode, clamp the paper-clad copper sample and move thepaper-clad copper sample to the position of the pressure relief valve; the paper-clad copper sample naturally sinks to the bottom of the oil draining valve under the action of gravity; and therefore,a copper sheet, insulating paper and insulating oil can be sampled simultaneously. With the experimental device adopted, copper sheets, insulating oil and insulating paper samples of different agingdegrees can be realized simultaneously; simulated experimental conditions are closer to an actual operating environment inside a transformer. The experimental device has the advantages of sealing performance, sturdiness and visualization.

Description

technical field [0001] The invention belongs to the technical field of transformer insulation monitoring and fault diagnosis, and in particular relates to an electrothermal combined aging experiment device and a sampling method of a transformer copper oil paper system. Background technique [0002] As the core of energy conversion and transmission in the power grid, power transformers are the most critical and expensive equipment in power transmission and transformation equipment, and their operational reliability is directly related to the economic operation, safety and stability of the power grid. The insulation of the copper winding inside the transformer is mainly composed of insulating oil and insulating paper. During the long-term operation, it will gradually age due to the influence of heat, electricity, machinery, chemistry, environment and other factors, resulting in a decline in the electrical and mechanical properties of the insulation. Affect the service life of ...

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Problems solved by technology

At present, scholars at home and abroad have proposed some design schemes for the experimental device of transformer oil-paper insulation electrothermal aging, which can realize the aging and sampling measurement of oil and paper, but they cannot realize the simultaneous sampling of copper, oil and paper under different aging degrees.

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