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Distribution transformer keeping output voltage constant

A distribution transformer and output voltage technology, which is applied in the field of distribution transformers, can solve the problems of multiple voltage regulation conditions and unstable output voltage of distribution transformers, and achieve the effect of constant output voltage

Active Publication Date: 2017-08-04
ZHEJIANG DIANNIU ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects in the prior art such as unstable output voltage of distribution transformers and many voltage regulation situations, the present invention provides a distribution transformer with simple circuit but constant output voltage

Method used

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  • Distribution transformer keeping output voltage constant
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  • Distribution transformer keeping output voltage constant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the distribution transformer that keeps the output voltage constant includes the main transformer and the auxiliary transformer 5. The low-voltage output terminal of the main transformer is connected to the primary side of the auxiliary transformer 5 through the voltage regulator 1, and the input terminal of the voltage regulator is controlled by the main transformer. power supply, and the secondary side of the auxiliary transformer 5 is connected in series with the secondary side of the main transformer.

[0022] The voltage regulator 1 is composed of at least one single-phase voltage regulation circuit. In this embodiment, the voltage regulator is communicated with one single-phase voltage regulation circuit. The input end of the single-phase voltage regulation circuit is connected with IGBT tubes G1, IGBT IGBT tube group 2 composed of tube G2, IGBT tube G3 and IGBT tube G4, in which IGBT tubes G1 and G3 conduct in the same direction, IGBT t...

Embodiment 2

[0026] The distribution transformer that maintains a constant output voltage includes a main transformer and an auxiliary transformer 5 , the low-voltage output end of the main transformer is connected to the primary side of the auxiliary transformer 5 through a voltage regulator 1 .

[0027] Such as figure 2 As shown, in this embodiment, the voltage regulator 1 is a three-phase voltage regulator, that is, the three-phase voltage regulator is connected in Y connection by three single-phase AC voltage regulation circuits, and the input end of each phase AC voltage regulation circuit is connected to There is an IGBT tube group 2 composed of IGBT tubes G1, IGBT tubes G2, IGBT tubes G3 and IGBT tubes G4 in series, in which IGBT tubes G1 and G3 conduct in the same direction, IGBT tubes G2 and G4 conduct in reverse, and IGBT tubes G2 and G3 conduct in the same direction. The output terminals of the AC voltage regulating circuits of each phase are connected through the filter circui...

Embodiment 3

[0035] Such as image 3 As shown, its basic circuit diagram structure is the same as that of Embodiment 2, the difference is that the secondary side of the auxiliary transformer 5 is connected to the input end of the three-phase voltage regulator, and the input end of the three-phase voltage regulator is directly controlled by the compensated load voltage supply.

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Abstract

The invention relates to the technical field of power electronics, particularly to a distribution transformer keeping output voltage constant. The distribution transformer includes a main transformer, and is characterized in that the distribution transformer also includes an auxiliary transformer, the low-voltage output end of the main transformer is connected with the primary side of the auxiliary transformer through a voltage regulator, the voltage regulator comprises at least one single-phase voltage regulator circuit, and the input end of the single-phase voltage regulator circuit is connected with an IGBT group formed by four IGBTs sequentially connected in series, wherein the first and the third IGBTs are conducted in the same direction, the second and the fourth IGBTs are reversely conducted, and the second and the third IGBTs are connected with the output end of the voltage regulator of the single-phase voltage regulator circuit through a filter circuit. Under the condition of basically not changing the settings of an original distribution transformer, an auxiliary transformer is added, the primary side of the auxiliary transformer is supplied with power by the voltage regulator, the voltage can be continuously regulated, the polarity can be changed, and constant output voltage is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a distribution transformer for maintaining a constant output voltage. Background technique [0002] With the continuous improvement of industrial technology and living standards, the use of a large number of precision instruments and high-quality electrical appliances has also put forward higher requirements for the power supply quality of the distribution network. The output voltage of the existing distribution transformer changes continuously with the change of the load and the change of the input terminal voltage. The instability of the output voltage causes the decline of the efficiency, life and performance of the electrical equipment. Most of the existing distribution transformers are equipped with off-load tap changers, but they cannot solve the problem of constant output voltage. Very few transformers are equipped with on-load tap changers, but they are costly...

Claims

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Application Information

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IPC IPC(8): H02M5/293H02M5/12H02M1/32
CPCH02M1/32H02M5/12H02M5/293H02M5/2932
Inventor 汪隽迈冯志宏
Owner ZHEJIANG DIANNIU ELECTRIC CO LTD