Side-extended-triangle-shaped autotransformer

Abstract

The invention discloses a side-extended-triangle-shaped autotransformer. The side-extended-triangle-shaped autotransformer comprises an iron core, a low-pressure-side triangular winding and a high-pressure-side extended-side winding, wherein the low-pressure-side triangular winding has a triangular circuit layout; and a first end (a), a second end (b) and a third end (c) of the low-pressure-side triangular winding are respectively connected with a first extended-side winding (A), a second extended-side winding (B) and a third extended-side winding (C) of the high-pressure-side extended-side winding. The high-pressure-side extended-side winding has a star-shaped circuit layout. The side-extended-triangle-shaped autotransformer is simple in structure and easy to manufacture and maintain; the problem of harmonic suppression of the autotransformer can be effectively solved; and the problem that the manufacturing cost and the running cost of an isolation transformer are low can also be solved.

Description

technical field [0001] The invention relates to a three-phase transformer, in particular to a three-phase transformer whose windings are connected in a delta-shaped extension, which can be widely used in the fields of power supply and transformation of power grids, power supply matching of imported equipment, new energy power supplies, and the like. Background technique [0002] For a long time, due to its advantages of low manufacturing cost and low operating loss, autotransformers have played an important role in power grid power conversion, power supply matching for import and export equipment, and other places. However, see Figure 1a-Figure 1b , The winding of the traditional three-phase autotransformer adopts the Y-type connection method, which is tapped from the middle, which limits its use in places that require suppression of grid harmonics. [0003] With the popularization of switching power supplies, frequency conversion, and widespread use of rectification equipm...

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Problems solved by technology

However, see Figure 1a-Figure 1b , the winding of the traditional three-phase autotransformer adopts the Y-type connection method, which is tapped from the middle, which limits its use in places that require suppression of grid harmonics

[0003] With the popularization of switching power supplies, frequency conversion, and widespread use of rectification equipment, the harmonic interference to the power grid is becoming more and more serious. In order to solve the problem of harmonic pollution, people have to use another isolation transformer. Refer to Figure 2a-Figure 2b , this kind of transformer adopts double-delta connection method or star-delta connection method, which can effectively control the 3rd, 5th, 7th and other low-order harmonics that cause major damage to the power grid, but its own loss is large, which increases the operating cost , causing waste of increasingly scarce energy, and high manufacturing costs, increasing the user's equipment investment burden

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