Oil paper insulated electrothermic aging test and local discharge integrated detection device of transformer

Abstract

The invention provides an integrated testing device used in local discharge detection for oil immersion power transformer paper oil insulation electric heating ageing study, comprising an electric heating ageing oven, a test object electrode system and a high-voltage alternating current power supply system. The test object electrode system is arranged in the electric heating ageing oven and connected with the high-voltage alternating current power supply system. The testing device also comprises a local discharge signal acquisition system which comprises a local discharge signal transducer, a signal transmission cable and a data acquisition processing device. The input end of the signal transducer is connected with the test object electrode system, the output end is connected with the data acquisition processing device through the signal transmission cable; the testing device can acquire the local discharge parameter in the electric heating ageing process of paper oil insulation, provides data for the electric heating ageing study and can further realize the on-line monitoring of transformer paper oil insulation electric heating ageing state on the basis of the study.

Description

technical field [0001] The invention relates to the technical field of insulation aging and life prediction of electric equipment, in particular to a transformer oil-paper insulation electrothermal aging test and partial discharge integrated detection device and test method. Background technique [0002] The power transformer is the core of electric energy conversion and transmission, and is the most important and critical equipment in the power grid. Currently, a significant portion of transformers in the power industry around the world have reached the end of their design life. Transformer aging assessment and life prediction technology has been concerned by many scholars at home and abroad. The main form of the internal insulation of large-capacity power transformers is the insulating oil-fiber paper composite insulation system, which gradually ages due to multiple factors such as electricity, heat, and machinery during operation, and is attacked by external factors such...

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Problems solved by technology

[0003] There are few patents on electrical equipment insulation aging at home and abroad, and most of the existing patent documents are about large-scale motors or variable-frequency motors and other rotating equipment, such as the Chinese invention patent application publications with publication numbers CN02139423.7 and CN200510022488.9 , there is no publicity about the test device and method for insulation aging of large power transformers; in addition, there are many patent documents about partial discharge measurement, such as the publications of Chinese invention patent applications with publication numbers CN200510000496.3 and CN00101178.2. The patent documents all introduce the relevant devices and test methods for partial discharge measurement in detail, but most of these patents are for specific electrical equipment, and there is no public report on the combination of insulation aging assessment

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