Power transformer oil purifier described in this article is equipment that filters charged transformer oil in running transformers. Transformer oil can be filtered on line to improve performance of the transformer oil. This article analyzes the necessity of the purification and filtration on processing power transformer oil, describes the overall design ideas of oil purifier in line. Through examples, power transformer oil purifier in line is further discussed the steps and precautions in the application. By comparing the power outage transformer oil purifier and oil purifier in line, the superiority and science of oil purifier in line are clarified.

Through the analysis of harmonics caused by transformer, capacitor, electromagnetic voltage transformer and other accident, harmonics is an important indicator of power quality, which has been included in the “pollution" of power grid is found. In order to understand the harmonic, this paper from the concept of quality of electric energy, and then gradually extended to the field of harmonics. This paper firstly introduces the various reasons and equipment may produce harmonic, Secondly, illustrate harm of harmonic to operation of transformers, capacitors, electromagnetic voltage transformers and other electrical equipment, let more people know and understand the relevant knowledge of the harmonic, In order to save technical force and provide scientific basis for future effective harmonic.

In this paper, the rural power low-voltage of Li-Tang mains Trunk line raised the issue of secondary boost more than two groups reactive power compensation solutions, focusing on both the load power load variance method to calculate the location and placement of the regulator boost ratio, using precise moment method and reactive secondary terminal voltage rises method calculates the load side of intelligent reactive compensation on the trunk and installation location and capacity, to achieve the optimum design load tap rural power lines and intelligent var compensator configuration. The program changed in Fushun Li-Tang Trunk line in Li-Jia Transformer substation significantly after the implementation of effective, so that the end of the 31km-long line of power quality standards. Economic operation efficiency is improved.

This paper briefly expounds the determination of transformer pressure value, and introduces the principles of power frequency ac withstand voltage, variable frequency series resonance withstand voltage and multi-frequency induced withstand voltage. It also expounds the ac withstand voltage wiring method, and demonstrates a simple way in withstand voltage test on low voltage winding.

Contamination Monitoring is an important means of preventing pollution flashover of electrical equipment, the monitoring data can make the insulator design more economical, leading to a both win in economic and operational safety. The existing monitoring tools are based mainly on ESDD, the measurement data is affected by many factors, limited guidance. This paper will analyze several of factors which have impact on ESDD, and also propose additional measures and many forward-looking recommendations to face the reality, so that we can carry out anti-pollution work better.