Electrical insulation electric heating aging test device under composite voltage

Abstract

The invention discloses an electrical insulation electric heating aging test device under composite voltage, which comprises two corona-free high-voltage test transformers and at least one test box, wherein a box body of the test box insulates heat; the test box is internally provided with a heating device; at least one high-voltage electrode which is connected with high-voltage output ends of the corona-free high-voltage test transformers is introduced to the top of the test box; the lower part of the test box is provided with at least one detection terminal; and the high-voltage electrodes and the detection terminals are respectively insulated with the box body of the test box. The electrical insulation electric heating aging test device under composite voltage provided by the invention can effectively simulate the composite electricity and heat stress borne by an electrical device in operation, also can test sample products under different temperatures, voltage types and voltage grades at the same time, and can obtain the breakdown voltage and breakdown time of the sample products in the aging process.

Description

technical field [0001] The invention relates to a test device, in particular to a test device for electric insulation and electric heat aging under compound voltage. Background technique [0002] The converter transformer is the key equipment in the DC transmission system, and the valve-side winding of the converter transformer bears the joint action of both AC and DC voltages at the same time. The valve side insulation of the converter transformer is composed of mineral oil and fiber paper. In the long-term operation process, it is gradually aging due to the influence of electricity, heat, machinery, environment and other factors, resulting in the decline of physical, chemical and electrical performance, which seriously affects the operation reliability of the power system. Through the method of accelerated aging test, the converter transformer is studied. The aging characteristics of the valve side insulation and the evaluation of the remaining life are important means to...

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Problems solved by technology

[0003] At present, the accelerated aging test equipment at home and abroad mainly conducts accelerated aging tests on small materials and electronic components through accelerated stress means such as heat, light, weak electricity, and vibration, or accelerated electrothermal aging tests of single AC voltage stress and thermal stress. Realize the electrothermal combined aging test for the valve side insulation material of the converter transformer, and accurately evaluate the life of the valve side insulation

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