Non-contact on-load automatic voltage regulation distribution transformer and method for automatic voltage regulation

Abstract

After the reform of a power grid, the voltage quality is relatively improved but the fluctuation range of voltage still exceeds the national regulation. The invention relates to an automatic voltage control distribution transformer with contactless on-load and a method for carrying out automatic voltage control. The automatic voltage control distribution transformer with the contactless on-load comprises a distribution transformer main body, and an automatic voltage control tapping switch with the contactless on-load. The distribution transformer main body is a current energy-saving distribution transformer with various models. Three tapping joints of nominal voltage such as UN, 95 UN and 105% UN are remained on the neutral point side by a high-voltage winding. The position between each tapping point and neutral point is provided with an anti-parallel thyristor module which is regarded as a contactless tapping switch. By measuring the variation of a high-voltage terminal voltage provided by a concurrent working power transformer T, a single chip supervisory system sends a pulse which is regarded as a trigger signal of the anti-parallel thyristor module off the contactless tapping switch, and the change of a working tapping joint is carried out, and the working tapping joint is regarded as the automatic voltage control tapping switch with the contactless on-load. The automatic voltage control distribution transformer with contactless on-load and the method for carrying out automatic voltage control are applied to a contactless on-load automatic voltage control distribution transformer.

Description

Technical field: [0001] The invention relates to a non-contact on-load automatic voltage regulation distribution transformer and a method for automatic voltage regulation. Background technique: [0002] The main indicators of power quality are frequency, voltage and waveform, and the stability of voltage is one of the most important indicators of power quality. With the development of society and the improvement of people's living standards, people's demand for power supply stability and reliability After technical transformation, although the voltage quality of rural power grids has improved, the range of voltage fluctuations in many places still exceeds the allowable value stipulated by the state. Voltage fluctuations directly affect the normal operation of agricultural production and people's lives. Power equipment It has brought serious harm to people's lives and seriously restricted the development and progress of the rural economy. [0003] The distribution power tran...

AI Technical Summary

Problems solved by technology

[0004] In the case of sufficient reactive power in the power system, the use of on-load automatic voltage regulation for distribution transformers is the most effective way to stabilize voltage. The switch is the main device of the automatic voltage regulating transformer. Most of the existing tap changers are mechanical contact switches. This kind of switch is not only accompanied by the generation of arc when switching, the mechanical contacts are easy to be damaged, and the adjustment speed is slow. Cannot be operated frequently, thus limiting the application range of this switch

[0005]At present, the distribution transformers all use non-excitation tap-changers. This kind of switch needs to cut off the power of the system to make adjustments, thereby reducing the power supply and disturbing the user's For normal electricity consumption, at the same time, this kind of switch cannot be adjusted frequently, and can only be adjusted periodically. However, the rural power grid fluctuates greatly between the load peak and the trough every day, and this kind of switch does not work for this situation. And if the off-excitation tap-changer is frequently adjusted, it is easy to cause oil leakage from the seal

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