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This paper aims to establish criteria for the automatic classification of surface conditions of outdoor insulator based on the leakage current (LC) analysis and fuzzy logic approach. The study is done in an artificial fog chamber and the LC is characterized for different stages; e.g. dry, wetted and presence of early discharge activities. Time-frequency and spectral analysis are adopted to calculate...
Insulator flashover under polluted conditions has been a serious threat on the reliability of power systems. It is known that the flashover process is mainly affected by the environmental conditions such as the pollution level and humidity. Those are the essential parameters influencing the wetting process. This paper presents an investigation of the characteristics of the leakage current (LC) developed...
Electrical systems are subjected to constraints more severe continuation with overvoltage's which can be due to lightning and switching strikes. Under the influence of the intense corona effect which accompanies of atmospheric overvoltage, these overvoltages undergo deformations at the same time as an attenuation of their amplitude, this phenomenon of distortion, which is superimposed on the distortion...
Corona in the HV overhead transmission lines is a highly nonlinear and non deterministic phenomenon, it can be an important source of attenuation and distortion of overvoltage surges. This paper presents a mathematical model to predict the capacitive changes at conductor of transmission line due to corona. This model has been incorporated into the Alternative Transients Program version of the Electromagnetic...
Several mathematical and physical models of corona effect have been developed over the world. The main difference between them resides in the modeling techniques and the adopted hypotheses. To the author knowledge, until now the ATP-EMTP (ElectroMagnetic Transients Program) package does not have such model. The main objective of this work is the implementation of a model which is based on the phenomenon...
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