One of the effects of voltage and current harmonics within the power systems is ageing of the insulation of electrical equipment and components and thus shortening of their useful life. In the rotating machines harmonics cause additional stator and rotor losses and reduce the output torque. In this sense, the purpose of this paper is to determine an electric motor life (with together motor efficiency) according to the temperature increase due to harmonic currents.

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The demand to electrical energy increases day by day. It is very important to rejlect this increasing demand accurately to power plant planning. ANN technique can be efectively used in load forecasting. In this paper, ANN load forecasting is performed by using some non-linear input parameters such as temperature, humidily, rain conditions. Real electrical date obtained for the national grid and meteorological parameters are used in the presented application.