Overheating preventing structure for super-large current lead of transformer

Abstract

The invention relates to an overheating preventing structure for a super-large current lead of a transformer. The overheating preventing structure is arranged on a low-voltage side of the transformer, and a shielding method combining a magnetic shield and a copper shield is adopted around a large-current lead on the low-voltage side. The shielding method combining the magnetic shield and the copper shield includes that a clamping piece copper shield is arranged on a core clamp piece on the upper portion of the low-voltage side, an oil tank copper shield is arranged on the inner surface of a tank cover on the low-voltage side and on a low-voltage tank wall, and simultaneously the oil tank magnetic shield in the vertical direction is arranged on the low-voltage tank wall. A low-voltage coil of the transformer adopts a two-column parallel connection structure, and a leading-out head of each column of coil is arranged on the upper portion, and two lead copper bars are arranged parallelly in juxtaposed mode. The overheating preventing structure solves the problem of overheating of a local portion of a structural member around the large-current lead. A copper plate is directly welded on a steel structural member, the structure is simple, and the manufacturability is good.

Description

technical field [0001] The invention relates to a manufacturing technology of a transformer, in particular to a structure for preventing overheating of a super-large current lead wire of a transformer. Background technique [0002] At present, China has ushered in a new era of vigorously developing nuclear power. In the next 20 years, the proportion of China's total installed nuclear power generation capacity will increase from less than 2% of the current national generator capacity to 5%. As the number of civil nuclear power plants in China is increasing year by year, the demand for safe, reliable, and ultra-large-capacity generator transformers for single-phase nuclear power plants is also increasing, so the demand for single-phase ultra-large-capacity transformers will increase. The newly-built Guangdong Taishan Nuclear Power Plant in China adopts the most advanced third-generation nuclear power technology EPR1000 in the world, and the power generation of a single unit re...

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Problems solved by technology

[0004] Aiming at the defects in the prior art such as the overheating of the lead wires caused by the high current of the low-voltage lead wires of the transformer, the technical problem to be solved by the present invention is to provide a super-high-current lead wire overheating prevention structure of the transformer that can solve the local overheating problem of the structural parts around the high-current lead wires

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