The paper discusses the impact of electric vehicles on household electric energy consumption. The estimation of daily and annual energy demand of an electric vehicle from an average household is investigated and expressed as the probabil ity of energy required to charge the vehicle battery. A variety of scenarios of electric vehicles' performance for present day and future were analysed using a Matlab simulation to estimate the energy demand. The data used for the simulation are based on UK travel patterns and the National Travel Survey. The results demonstrate that, despite of significant increase of electric vehi cles in future, the estimated energy demand by the vehicles from households will be reduced due to increase of the number of charging stations in other locations.

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The paper presents a new approach for detection of broken rotor bar fault in squirrel cage induction motors operating under varying load conditions. A mathematical model used in the presented method was developed using winding function approach to provide indication references for induction motor parameters under load variation. The model shows a strong relationship between broken rotor bar fault and stator current. The method is based on analysis of stator current using discrete wavelet transform. To verify the proposed method a squirrel cage induction motor with 1, 2 and 3 broken bars at no-load, half-and full-load conditions was investigated. Obtained experimental results confirmed the validity of the proposed approach.

This paper demonstrates a possibilities of using brute force methods for evaluating the effectiveness of hierarchical management systems. Proposed model of hierarchy provides finding the optimal distribution of load between the executive elements at a predetermined structure. A simple hierarchical structure has been used as an example to investigate the functionality of the model and its software implementation.

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