High voltage isolation transformer

Abstract

The present invention provides a high voltage isolation transformer, comprising one or more sub-transformers; when the sub-transformer is provided with one, the high voltage isolation transformer is equivalent to the sub-transformer; when multiple sub-transformers are provided, the plurality of sub-transformers are connected in a cascade form, and each sub-transformer is connected in parallel withan equalizing device. The high voltage isolation transformer provided by the invention avoids the situation that partial discharge is difficult to control, the voltage level can be extended to hundreds of kilovolts and above, heat dissipation of windings is facilitated, effective insulation isolation of the compact space can be realized, and the difficulty of transformer insulation design and manufacturing process difficulty and volume can be effectively reduced. The high voltage isolation transformer in the invention has high insulation tolerance strength and low field strength distribution,simultaneously, effective suppression of the partial discharge can be realized, low partial discharge design of the transformer is realized, and the magnitude of partial discharge in the voltage level above hundred kilovolts does not exceed 50pC. The high voltage isolation transformer has the advantages of small structural size, high mechanical strength and flexible installation.

Description

technical field [0001] The invention relates to the field of high-voltage power transmission, in particular to a high-voltage isolation transformer. Background technique [0002] Power transformers are one of the most commonly used equipment in power systems. They are mainly used for voltage conversion between different voltage levels, power transmission in power systems, and current conversion in systems with different transmission capacities. However, as far as the power transformer itself is concerned, it is a very conventional design. . However, with the current development of power technology, especially the development of flexible AC power transmission and high-voltage direct current power transmission, the functions of power transformers have been expanded, not only limited to power transmission in power systems, but also extended to many other special occasions, such as for some key power Auxiliary power supply of equipment, these occasions require the transformer t...

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Problems solved by technology

[0006] In order to overcome the problems in the above-mentioned prior art that partial discharge is difficult to control, the voltage level is difficult to expand, and it is not conducive to the heat dissipation of windings, the present invention provides a high-voltage isolation transformer, which includes one or more sub-transformers; when there is one sub-transformer, the high-voltage isolation transformer It is equal to the sub-transformer; when there are multiple sub-transformers, the multiple sub-transformers are connected in cascaded form, and each sub-transformer is connected with a voltage equalizing device in parallel. The high-voltage isolation transformer provided by the invention avoids the situation that partial discharge is difficult to control, and the voltage level Can be extended to hundreds of kilovolts and above, and it is good for winding heat dissipation

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