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Distribution transformers that maintain a constant output voltage

A technology for distribution transformers and output voltage, applied in the field of distribution transformers, can solve the problems of many voltage regulation conditions and unstable output voltage of distribution transformers, and achieve the effect of constant output voltage

Active Publication Date: 2019-11-08
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 transformers that maintain a constant output voltage
  • Distribution transformers that maintain a constant output voltage
  • Distribution transformers that maintain a constant output voltage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 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.

[0017] 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

[0021] 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 .

[0022] 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

[0030] 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, in particular to a distribution transformer for maintaining a constant output voltage. It includes a main transformer, and is characterized in that it also includes an auxiliary transformer. The low-voltage output end of the main transformer is connected to the primary side of the auxiliary transformer through a voltage regulator. The voltage regulator is composed of at least one single-phase voltage regulation circuit, and the single-phase voltage regulation circuit The input end is connected to an IGBT tube group composed of 4 IGBT tubes connected in series, in which the first and third IGBT tubes conduct in the same direction, the second and fourth IGBT tubes conduct in the opposite direction, and the second and third IGBT tubes are connected to single-phase through a filter circuit. The output terminal of the voltage regulator of the voltage regulating circuit. An auxiliary transformer is added without changing the settings of the original distribution transformer basically. The primary side of the auxiliary transformer is powered by a voltage regulator. The voltage is continuously adjustable and the polarity can be changed to ensure a constant output voltage.

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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Patent Type & Authority Patents(China)
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