Test system and method for short-circuit withstand capacity of UHV transformer

Abstract

The invention discloses a test system and method for the short-circuit withstand capacity of an UHV transformer. The test system includes: a power supply module, a first boost module and a second boost module, and the power supply module includes: a generator G 1 to generator G n0 , and n0 generators are connected in parallel; the first step-up module includes: a first step-up transformer DA 1 to the first step-up transformer DA n1 ; The second step-up module includes: the second step-up transformer DB 1 to the second step-up transformer DB n2 and isolation step-up transformer DC 1 to isolated step-up transformer DC n3 , the transformer to be tested and the intermediate transformer of the subsequent stage are double supported by an insulating platform. The UHV transformer short-circuit withstand capacity test system of the present invention has relatively simple structure, good test effect, and low test cost, solves the difficult problem in the field of UHV transformer short-circuit withstand capacity test verification, and can complete the full capacity and full voltage of UHV and ultra-high voltage transformers short-circuit withstand capability test.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a test system and method for short-circuit withstand capacity of UHV transformers. Background technique [0002] UHV refers to the power transmission technology with a voltage level of 1000 kV and above AC and ±800 kV and above DC, which has technical advantages such as large transmission capacity, long distance, high efficiency and low loss. UHV transmission has played an important role in ensuring power supply, promoting the development of clean energy, improving the environment, and improving the security level of the power grid. [0003] The UHV transformer is the core equipment in the UHV transmission network. This kind of transformer will inevitably suffer from the impact of short-circuit current when operating in the transmission network. Whether it can withstand the impact of short-circuit current without damage will directly affect the quality of the tra...

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Problems solved by technology

[0004] However, the short-circuit test of the UHV transformer requires a large-capacity test power supply, an expensive test system, and rich test experience. Therefore, general transformer manufacturers do not have the conditions and qualifications to complete the short-circuit test, and only a few large-capacity laboratories have Transformer test conditions

However, the existing high-voltage test system still cannot meet the short-circuit withstand capacity test of UHV transformers.

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