نوع مقاله : مقاله برق
نویسندگان
1 دانشکده برق و الکترونیک دانشگاه سمنان
2 دانشیار گروه آموزشی قدرت ، دانشکده مهندسی برق و کامپیوتر دانشگاه سمنان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The improved limiting parameter method of Monte Carlo is used in this study to estimate the impact of back-flashover (BF) due to lightning and provide an evaluation criterion for the insulation risk of the transformer in the high-voltage substation. In order to avoid the computational burden of the transient-state simulation, the Monte Carlo (MC) simulation method is combined with the limiting parameter method while taking into account the environmental conditions governing the high-voltage substation. Insulating behavior may be different before or after applying stress. Additionally, it is necessary to consider how the presence of environmental pollutants affects on BF lightning overvoltage amplitude. Therefore, the voltage-time-dependent strength accumulation characteristic has been developed in this study based on the transformer's non-self-healing behavior when exposed to various insulation stresses. By selecting appropriate distribution of expected strokes to estimate insulation risk, the finite area MC method that is being proposed calculates the insulation risk of the transformer based on the transient overvoltage that appears at the transformer terminals. Also discussed is the relationship between BF lightning and the contamination level of the insulation under the stresses brought on by lightning strikes. In this manner, the insulation coordination of the transformer can be known with the least number of calculations by using the structural data of the substation, the lines connected to it, and the transformer. The simulation results presented in this study were performed in a real sample network.The results showed an 18 percent increase in insulation risk considering the effect of environmental condition.
کلیدواژهها [English]
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