Oil-immersion-type testing transformer with cooling circulation structure

Abstract

The invention discloses an oil-immersion-type testing transformer with a cooling circulation structure. The oil-immersion-type testing transformer comprises a testing transformer shell. The testing transformer shell is filled with insulating oil. An iron core, a high-voltage coil and a low-voltage coil are arranged in the testing transformer shell, the high-voltage coil and the low-voltage coil are coaxially arranged on the iron core, and the high-voltage coil is located outside the low-voltage coil. The oil-immersion-type testing transformer is characterized by further comprising the cooling circulation structure; the cooling circulation structure comprises a cooling pipe and an air compressor, the cooling pipe is filled with tetrafluoroethane, attached to the iron core and wound around the iron core, the low-voltage coil is separated from the iron core through the cooling pipe, necks are formed in the outer side wall of the cooling pipe and matched with the low-voltage coil in shape, and the low-voltage coil can be embedded into the clamping grooves to enable the low-voltage coil and the cooling pipe to be integrally wound around the iron core. The oil-immersion-type testing transformer has the advantages of being good in cooling effect and novel in structure.

Description

technical field [0001] The invention belongs to the technical field of test transformers, and relates to a cooling device for a dry-type transformer, in particular to an oil-immersed test transformer with a cooling cycle structure. Background technique [0002] test transformer, referred to as AC withstand voltage test Provides high voltage transformers. It is characterized by high output voltage, small capacity, transformer Short circuit impedance It is very large and the ratio is very large. [0003] Since the test transformer needs to be used on the test site, it is necessary to design a compact structure to minimize the volume under the premise of meeting the test capacity, so as to facilitate transportation and on-site installation. For the test transformer, the coil generates a lot of heat when it works for a long time, and the coil is easy to burn out, resulting in damage to the test transformer. [0004] In order to ensure that the heat generated by the test tra...

AI Technical Summary

Problems solved by technology

The water cooling method is one of the more common cooling methods for transformers on the market at present, that is, a water cooling device is installed on the transformer. This method is generally realized by the water circulation outside the primary or secondary hollow wire tube surrounded by the iron core. The water cooling device is placed outside the coil. This local cooling method can only cool the surface temperature, but not the internal temperature. The heat exchange area between the cooling device and the coil is small, which cannot achieve good heat dissipation and cooling effect.

Images