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measurement device cannot meet the requirements of the rapid development in the current power system because of the outdated structure while the Rogowski coil has significant advantages.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.

Metal oxide surge arresters cavity invasion along the humid, causing flashover discharge incidents, through the structure and assembly of metal oxide surge arresters construction process, discusses the causes MOA damp for various reasons. Test methods can be found listed MOA cavity invasion humid, and described the purpose of the various test methods and their respective advantages and disadvantages, while noting that the invasion is suspected cavity defects humid or with a family of metal oxide surge arresters, various test cycle should be shortened and comprehensive analysis, judgment, to prevent accidents of various test data.

According to the GMOA accident characteristics, the accidents causes of the GMOA are analyzed and the test methods applicable to GMOA are preferred. The principles and steps of the preferred test methods are described, and its feasibility and scientific are demonstrated.

The design structure of the high voltage winding of the box transformer lead to high voltage between the high voltage winding layers, and electric field of each layer winding end is over-concentration, and the additional loss of load loss is too high, and thus lead to further the enameled wire of high voltage terminal happens partial discharge seriously and cryogenic overheating are discussed through the defects analysis of box transformer and a series of related experiments, hanging core inspection and analysis. If the hydrogen content is overweight seriously, total hydrocarbons is overweight, and methane gas content of total hydrocarbons is very high, ethylene and acetylene is very low, it can initially determine that low-energy partial discharge fault is inside the device are demonstrated. Finally, the corrective measures for the common problem of this group box transformer are presented.