Reliability analysis of XLPE cables
Subject Areas :Mohammad Amin Nikkhah 1 * , Ramin Eslami 2
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Keywords: Cross-linked polyethylene cables, High voltage insulations, Arrhenius Law, Failure Rate, Operating Temperature, Reliability.,
Abstract :
High voltage equipment including transformers, generators and high voltage cables are among the most expensive equipment used in the power system, which imposes a lot of costs on the power grid in case of insulation failure. On the other hand, the outages caused by the failure of this equipment also leads to damage. Therefore, it is necessary to examine these equipments so that they can have good insulation endurance against overvoltages. On the other hand, the occurrence of overvoltages in the power grid is probable. The origin of these high voltages is due to the different switching that takes place in the power grid and is due to lightning. One of the important studies in the power system is reliability, which by conducting this study, the ability of this system to continue servicing subscribers is determined. In order to increase the reliability of the power grid, the reliability of the equipment used in it should be among the high voltage insulations. Accordingly, in this paper, the reliability of high voltage cross-linked polyethylene cables is investigated. In order to study the reliability of high voltage cables, the effects of environmental conditions on these insulations should be investigated. Accordingly, in this paper, the failure rate of high voltage cross-linked polyethylene cables is not considered constant, but the effect of environmental changes on the failure rate of these cables is considered. Arrhenius law is used to investigate the effect of temperature increase on high voltage insulations. In this law, the failure rate of high voltage cross-linked polyethylene cables is calculated in terms of the working temperature of the insulation. In order to determine the working temperature of the insulation, it is necessary to calculate the amount of equipment losses. The losses of electrical equipment also depend on the current passing through the conductors. Therefore, in this paper, the failure rate of cross-linked polyethylene cables and consequently their reliability in different environmental conditions are obtained
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