جستجوی مقالات مرتبط با کلیدواژه "insulation failure" در نشریات گروه "برق"

Today, the role of electric energy in creating social welfare and industrial development of human societies is not hidden from anyone. In recent years, comprehensive and complete laws have been compiled and implemented for the production and supply of this energy in the market. What shows up more than ever is the concern of engineers in this field for the production, transmission and uninterrupted supply of electrical energy. The use of efficient equipment with high reliability has led engineers to use gas insulated posts in transmission and distribution networks. The use of gas insulation, while reducing the dimensions, has caused a reduction in transportation costs and installation and commissioning time of this equipment. Although gas insulation equipment requires minimal repairs due to special manufacturing technology and insulation, but the reliability and proper functioning decreases as the life of this equipment increases. Often over time, partial drainage is a defect that occurs in this equipment. This event leads to insulation failure finally, which is an important quantity in assessing insulation conditions. The most common causes of partial discharge in gas substations are three factors: conductor electrode protrusion, Existence of void in insulation and free particles suspended in gas pressurized enclosure. In this paper, studies related to the factors affecting the insulation failure of GIS substations and its timely detection methods, based on the benefit of existing articles and research.

Resilience in power systems refers to the system's ability to withstand severe disturbances with a low probability of occurrence. Because in recent years extreme dust storms have caused severe damage to Iran's electricity industry, especially in the south and southwest, in this paper proposed a new scenario-based stochastic planning model for enhancement of power distribution systems resilience against extreme dust storms. In proposed model, in the first stage, the investment costs to improve the distribution system resilience against extreme dust storms are minimized due to the financial constraints, and in the second stage, the expected operating costs in dust storm conditions are minimized due to the operating constraints. Because network's insulation equipment are major cause of distribution system vulnerabilities in the dust storms, measures in the planning stage include replacement of porcelain insulators with silicon-rubber type, installation of automatic tie switches and installation of emergency generators. In the second stage, the measures are divided into preventive actions and corrective actions, and coordination between stages 1 and 2 is implemented in such a way that the results of each stage depend on the decision variables of the other stage. The simulation results for IEEE 33-bus test system and a 209 bus radial distribution network located in Khuzestan province, Iran, confirm the efficiency of the proposed model in different financial conditions.