Alternating-current ultrahigh voltage main transformer and regulation transformer combined partial discharge testing system and method

Abstract

The invention provides an alternating-current ultrahigh voltage main transformer and regulation transformer combined partial discharge testing system which comprises a variable frequency power source, a testing transformer, a compensation reactor, a capacitive voltage divider, partial discharge detection systems, a regulation compensation transformer and an alternating-current ultrahigh voltage main transformer. The output end of the variable frequency power source is connected with the low voltage side of the testing transformer. The high voltage side of the testing transformer is connected with the low voltage side of the regulation compensation transformer. The high voltage side of the regulation compensation transformer is connected with the low voltage side of the alternating-current ultrahigh voltage main transformer. The compensation reactor and the capacitive voltage divider are connected between the testing transformer and the regulation compensation transformer in parallel. The alternating-current ultrahigh voltage main transformer and the regulation compensation transformer are each provided with one partial discharge detection system. Alternating-current ultrahigh voltage main transformer and regulation transformer on-site partial discharge testing can be completed at a time, so that the testing procedures are greatly simplified; during testing, electrical connecting wires of the alternating-current ultrahigh voltage main transformer and the regulation compensation transformer do not need to be disassembled, on-site workloads are lowered, and the working efficiency is improved.

Description

technical field [0001] The invention relates to a field test method for a power transformer, in particular to an AC UHV main transformer modulation combined partial discharge test system and method. Background technique [0002] The 1000kV AC UHV transmission project is currently the highest voltage AC transmission project in the world. With the succession of Jindongnan-Nanyang-Jingmen UHV AC test demonstration project and expansion project, Anhui East Huainan-Shanghai AC UHV transmission project Putting into operation, AC UHV is showing a trend of vigorous development in my country. [0003] AC UHV transformer is one of the most important and expensive equipment of AC UHV transmission project. In order to ensure the quality of transformer production and installation, and to find hidden dangers in transformer operation, it is necessary to carry out transformer handover and pre-test on site. For AC UHV transformers, the long-duration induction withstand voltage test with par...

AI Technical Summary

Problems solved by technology

[0006] 1) Insufficient assessment of voltage regulation and compensation transformer insulation

[0007] 2) It is necessary to remove and restore the connecting wires of the main transformer, which requires a lot of work

[0008] 3) Two partial discharge tests need to be carried out, which requires a lot of test equipment and low efficiency

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