Abstract. Dengue fever is a recurring public health problem afflicting thousands of Malaysians annually. In this paper, the risk map for dengue fever in the peninsular Malaysian states of Selangor and Kuala Lumpur was modelled based on co-kriging and geographical information systems. Using population density and rainfall as the model's only input factors, the area with the highest risk for dengue infection was given as Gombak and Petaling, two districts located on opposite sides of Kuala Lumpur city that was also included in the risk assessment. Comparison of the modelled risk map with the dengue case dataset of 2010, obtained from the Ministry of Health of Malaysia, confirmed that the highest number of cases had been found in an area centred on Kuala Lumpur as predicted our risk profiling.
-Lightning over voltage has been a dilemma since the early days of electricity. Lightning mainly occurs on the Overhead Transmission Lines and overvoltage generated due to lightning travels along the line and ultimately reaches to the substation, where this overvoltage can damage the expensive equipment like Power Transformers, Circuit breakers, Isolators, Current Transformers etc. Power System networks in the urban areas mainly consist of Overhead Transmission Lines, High Voltage XLPE Power Cables and Gas Insulated Substations (GIS). The evaluation of the transient behavior of combined high voltage systems consisting of overhead lines, cables and GIS is an important task. In this research work, the complete model has been developed by using PSCAD/EMTDC computer application. The modeling of each component has been done by using the manufacturer's datasheets/parameters. The transient over voltages have been observed at different points of the power system by injecting lightning current. Surge arrestors have been used to mitigate the over voltages in the system. The outcome of this research would be to improve the insulation coordination of the 132kV Power System in Pakistan.
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