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Articles by J. Jasni
Total Records ( 3 ) for J. Jasni
  J. Jasni , N. Azis , H. Hizam , M.Z.A. Kadir , M.N. Mariun , S.B.M. Noor and S. Sobri
  This study has been initiated to improve the time taken by the CPF method and eliminate the convergence problem for the tested system by enforcing the General Minimal Residual (GMRES) method at the initial point at the start up, herewith referred as CPF-GMRES solver. Analyses have shown that this new algorithm not only reduced the computation time but also eliminated the convergence problem for the tested system.
  M.Z.A. Ab Kadir , M.H. Ahmad and J. Jasni
  The withstand capability of the insulation system of an equipment under lightning overvoltages is measured by the international standard 1.2/50 μs waveform. Many workers and designers of the power apparatus equipment have dedicated their research tried to understand how the insulation behaves under the non-standard waveform. The fact that the lightning-caused transient voltage can have very fast components and the need for higher reliability and cost effectiveness have added the impetus in recent years to better understand the effects of a non-standard lightning voltage on the power system. As far as the lightning is concerned, much attention has been paid to the breakdown occurring at extremely fast rise times, which could be in nanosecond regime. This research provides some reviews on the non-standard waveform of the lightning and focuses on the simulation of the effect of the non-standard lightning current and waveshape on lightning surge analysis using the PSCAD/EMTDC software.
  M.Z.A. Ab Kadir , W.F. Wan Ahmad , J. Jasni and H. Hizam
  This research focuses on the simulation of the effect of corona model on different conductors used in transmission line design when subjected to the lightning surge. The paper details the procedures used in modelling the corona, as well as the implementation in the PSCAD/EMTDC software for surge propagation studies. There are many models available range from a simple and fixed capacitance to the more complex voltage-dependent capacitance. The corona used for this study is modelled based on the approached relationships and the analyses were done by comparing the results with other models for different types of conductors. The travelling voltage is then measured at different point-of-interest (POI) and compared in terms of the steepness and magnitude for different conductors.
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