Heat dissipation method for intermediate frequency amorphous alloy shell type transformer

Abstract

The invention discloses a heat dissipation method for an intermediate frequency amorphous alloy shell type transformer, comprising the following concrete steps of: firstly, arranging heat conducting thin plates on two iron core columns of the shell type transformer in a clinging mode, and conducting heat of a middle iron core column out along the upper side and the lower side of a heat conducting plate by virtue of the heat conducting thin plates clung to the iron core columns; secondly, placing an iron core provided with a winding into an oil tank, wherein the oil tank is filled with transformer oil, and cooling a low voltage winding and a high voltage winding by virtue of a transformer oil way; and thirdly, transmitting heat produced by the transformer to external environment by virtue of convection heat transfer between the outer surface of the oil tank and the air. The heat dissipation method disclosed by the invention can effectively improve heat dissipation conditions on the middle iron core column of a thin and high intermediate frequency amorphous alloy shell type transformer and windings around, thus maximum temperature rise of the transformer is reduced. The intermediate frequency amorphous alloy shell type transformer adopted by the invention has a simple structure and process, the heat conducting plate produces no heat, occupying space is small, and no external power supply the same with that of a cooling fan is required, thus being applicable to severe environment with poor working conditions such as an offshore wind power generation platform.

Description

technical field [0001] The invention relates to a heat dissipation technology for a transformer, in particular to a heat dissipation method for an intermediate frequency amorphous alloy shell type transformer. Background technique [0002] The use of renewable wind energy is shifting from land to sea. In offshore wind power generation, the AC transmission of submarine cables has large reactive power fluctuations, and DC transmission can overcome this shortcoming, which will become the development trend of offshore power transmission in the future. In addition, the onshore distributed power generation system is easier to realize multi-terminal connection by using DC grid than AC grid. In order to realize low-voltage DC to high-voltage DC conversion, a kilohertz-level intermediate frequency transformer must be used. Under medium frequency conditions, amorphous alloys are thinner than electrical silicon steel strips, and have the characteristics of less loss than iron cores. ...

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Problems solved by technology

A search of existing technical documents found that the document "1Megawatt, 20kHz, Isolated, Bidirectional 12kV to 1.2kV DC-DC Converter for Renewable Energy Applications" (The 2010 International Power Electronics Conference) proposed a heat dissipation structure for a single-phase core transformer. A water-cooled heat sink is placed between each iron core column and the low-voltage winding. The disadvantage of this heat dissipation method is that the leakage magnetic field on the heat dissipation structure causes eddy current, which increases additional loss and heat. In addition, a water deionization device is required.

This document also proposes a similar shell-type transformer, which adopts the heat dissipation method of aluminum plates and heat sinks on the upper and lower yokes respectively; the document also proposes another matrix transformer structure, in which each low-voltage winding is independent, and the high-voltage winding is shared and a layer is established. The two structures are not only bulky, but also the high-voltage winding layout process for establishing the ventilation channel is complicated.

The above three heat dissipation structures are feasible for 12kV dry-type transformers, but the insulation strength of transformers with voltage levels higher than 35kV is insufficient

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