Research On Harmonic Suppression Measures Of Transformer

Due to the development of social economy and people’s increasing demand for electricity, thus ensuring the purification of the power supply network becomes more and more important. Harmonic is the most general phenomenon in power system, and harmonic is the main index of power quality. At present a large number of nonlinear devices are adopted, the problem of harmonic pollution becomes worse and worse, so governing and researching harmonic pollution which improve the quality of power supply network and ensure the safe operation of the power system will be of important significance.There are two main measures to reduce harmonic:one is trying to reduce or eliminate the harmonic source by electrical installation, another is installing various types of filter near the harmonic source. This article will solve the harmonic problem how to use the principle and structure of transformer, which is important equipment in the power system.The development of the urban rail transit will become the significant time in next few years. This paper analyses the working principle of24-pulse rectifier unit and harmonic theory through the harmonic problems of urban rail transit power supply system, and analyses respectively with two phase shift±7.5°superposition of24-pulse phase-shifting principle of rectifier transformer. Proving the superiority of equivalent24-pulse rectifier system in reducing harmonic by analyzing.