Research On New Compensation Method And Efficiency Analysis Of Distribution Transformer

With the rapid development of China’s economy and society and the significant improvement of people’s living standards,the safety and stability of power production has received more and more attention.Distribution transformers,as the power equipment that converts electrical energy from high voltage to low voltage to directly supply users,belong to the last-stage transformer in the power system and play a pivotal role in the power distribution system.They play a role in transmitting,distributing and regulating electrical energy It has the characteristics of large number and wide distribution.The failure rate and power loss account for the largest proportion in the distribution network.It is also one of the most important and expensive electrical equipment in the distribution network.Its economic operation and reliability are directly Related to the safety and stability of the power supply system.Distribution transformers will produce certain losses during operation,including active loss and reactive loss,and reactive loss accounts for the majority,which will also cause a lot of economic losses.The existing reactive power compensation methods are carried out on the load side of the distribution transformer,so that the reactive power loss caused by the core excitation and eddy current during the operation of the distribution transformer itself does not have special on-site reactive power compensation measures.Therefore,it is of great significance to study a new compensation method for reactive power compensation on the high-voltage side of the distribution transformer,and to conduct a theoretical comparison and analysis of its safety and economic efficiency.This paper mainly studies the efficiency and advantages of adding a parallel capacitor on the high-voltage side of the distribution transformer for lightning protection and economic operation.First,clarify the reactive power demand and compensation principle,summarize the advantages and disadvantages of the existing reactive power compensation method,study and propose the idea of compensation on the high voltage side of the distribution transformer;ATP-EMTP simulation software establishes a simplified model of distribution transformer broadband lightning strike,performs lightning simulation analysis on the high-voltage side of the distribution transformer,and studies the effect of the addition of parallel capacitor devices and lightning arrester devices on the lightning overvoltage on the distribution transformer insulation.The conclusion that high-voltage compensation is conducive to limiting lightning overvoltage;finally,through theoretical analysis and simulation calculation of reactive powerrequirements of distribution transformers and distribution lines,comparative analysis of the safety and economic impact laws of high-voltage and low-voltage reactive power compensation of distribution transformers To study the characteristics of the effect of high-voltage compensation on the qualification rate of power supply voltage,and draw the conclusion that it is "safe,reliable,economically feasible,and excellent in efficiency" to install a non-compensation device on the high-voltage side of the distribution transformer.The research in this paper shows that the addition of a parallel capacitor device on the high-voltage side of the distribution transformer has a certain protective effect on lightning,which can reduce the wave head and steepness of the lightning wave on the high-voltage side.Reduce the distribution transformer lightning strike damage accident;adding a parallel capacitor device on the high voltage side can not only compensate the reactive power consumed by the distribution transformer itself,but also compensate the reactive power consumed by the distribution line and load,improve the high and low voltage side of the distribution transformer and the load The voltage qualification rate on the side is conducive to energy saving and consumption reduction,and improves economic efficiency.The conclusion of this paper can provide practical reference for lightning protection and reactive power compensation of distribution transformers.