System and method for testing short-circuit bearing capacity of extra-high voltage transformer

Abstract

The invention discloses a system and method for testing the short-circuit bearing capacity of an extra-high voltage transformer, the test system comprises a power supply module, a first boost module and a second boost module, the power supply module comprises generators G1 to Gn0, and n0 generators are connected in parallel; the first boost module comprises a first boost transformer DA1 to a first boost transformer DAn1; the second boost module comprises a second boost transformer DB1 to a second boost transformer DBn2 and an isolation boost transformer DC1 to an isolation boost transformer DCn3, and the transformer to be tested and the post-stage intermediate transformer are dual-supported by using the insulating platform. The system for testing the short-circuit bearing capacity of the extra-high voltage transformer is relatively simple in structure, good in test effect and low in test cost, solves the problem in the field of test verification of the short-circuit bearing capacity of the extra-high voltage transformer, and can complete the full-capacity and full-voltage short-circuit bearing capacity test of the extra-high voltage transformer and a super-high voltage transformer.

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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