The importance and necessity of the domestic and international distribution lightning direction and governance of the distribution line lightning damage are described, and the distribution line lightning protection assessment methods and procedures and how to choose the arrester combined with the actual situation are discussed. The lightning location system and counter combination is a means to test the merits of lightning protection components are deep-seated argued, and it will be an important part of future governance lightning disturbance of distribution lines. To prevent induction lightning damages is the main direction for distribution system is clarified through lightning damages prevention of 10kV Langshi line.

The traditional current transformer measurement device cannot meet the requirements of the rapid development in the current power system because of the outdated structure while the Rogowski coil has significant advantages. This article introduces some applications of Rogowski coil in power system. Now the research and application of Rogowski coil current transformer has become one of the most important research directions. Rogowski coil today has been widely used in electric power system.

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.

When the power transformer in partial discharge test, if the test equipment (voltage regulator, intermediate transformer, etc.) ontology partial discharge is big, it will severely affect the quality of testing, and even cause false identify.How to correctly identify partial discharge from the power transformer or from the test equipment itself, it is very important for the test personnel. This paper introduces to use the idle 220kV circuit breaker in parallel capacitor to cleverly find out in the whole process of partial discharge from the test equipment itself.