A water-cooled dry-type test transformer

Abstract

The invention discloses a water cooling dry-type test transformer. The water cooling dry-type test transformer comprises a test transformer shell, wherein an iron core, a high-voltage coil and a low-voltage coil are arranged in the test transformer shell, the high-voltage coil and the low-voltage coil are coaxially arranged on the iron core, and the high-voltage coil is arranged outside the low-voltage coil. The water cooling dry-type test transformer also comprises a water cooling device, wherein the water cooling device comprises a cooling water pipe, a cooling water tank and a cooling water pump installed on the cooling water pipe, a water inlet and a water outlet of the cooling water pipe are connected with the cooling water tank, the middle part of the cooling water pipe at least contacts the low-voltage coil, the contact part of the cooling water pipe and the low-voltage coil is in a spiral shape, the number of turns of the cooling water pipe is matched with the number of turns of the low-voltage coil, and the cooling water pipe and the low-voltage coil surround the iron core in parallel. The water cooling dry-type test transformer has the advantages of good cooling effect and novel 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 a water-cooled dry-type test transformer. Background technique [0002] Test transformer refers to a transformer that provides high voltage for AC withstand voltage test. It is characterized by high output voltage, small capacity, large transformer short-circuit impedance, and large transformation ratio. [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 transformer during operation doe...

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.

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