Method for performing on-site partial discharge test on ultrahigh voltage converter transformer

Abstract

The invention discloses a method for performing an on-site partial discharge test on an ultrahigh voltage converter transformer. The method is characterized in that: by using a test system consisting of a variable frequency power supply (1), a test transformer (2), a capacitive divider (3), a compensating reactor (4), a partial discharge test system (6), an ultrasonic positioning system (7), an ultraviolet imaging system (8), a wideband partial discharge on-line detection system (9) and a test object ultrahigh voltage converter transformer (5), the test object ultrahigh voltage converter transformer is subjected to the on-site partial discharge test by a method of symmetrical voltage application and interfering recognition. The method has the advantages that: 1, the ultrahigh voltage converter transformer is subjected to the on-site partial discharge test at home and abroad for the first time; 2, the ultrahigh voltage converter transformer is subjected to the on-site partial dischargetest by an interfering recognition technology and the method of the symmetrical voltage application for the first time; and 3, forceful technical support is supplied to the advanced running of the first + / -800kV ultrahigh voltage direct-current demonstration project in the world.

Description

technical field [0001] The invention relates to a field test method for a high-voltage converter transformer, in particular to a field partial discharge test method for an ultra-high voltage converter transformer. Background technique [0002] The ±800kV UHV DC transmission project is currently the highest voltage DC transmission project in the world. Some of the technical problems are unprecedented not only in China's power grid, but also in the history of the world's power grid development. To carry out experimental research on key technologies of UHV DC transmission It is the key to ensure the success of the project. [0003] The Xiangjiaba-Shanghai ±800kV UHV DC transmission demonstration project is the key work of the State Grid Corporation of my country, and it is the first UHV DC transmission and transformation project in China. UHV DC transmission has the advantages of long distance, large capacity, and low loss. It is an effective way to realize the optimal allocat...

AI Technical Summary

Problems solved by technology

[0005] The on-site partial discharge test of UHV converter transformers is the first at home and abroad. There are no standards for direct application, and there is no comprehensive and mature technology and experience for reference. Moreover, the site environment is complex and the requirements are strict. The test equipment has high voltage and high capacity. Therefore, the difficulty and technical requirements of the test are much higher than those of conventional ultra-high pressure engineering

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