KEYNOTE SPEAKER

Lightning Surge Analysis by EMTP and Numerical Electromagnetic Analysis Method

Prof. Akihiro Ametani
Doshisha University, Japan

Abstract

The EMTP has been widely used all over the world for the last 30 years for predictive calculations of over-voltages generated by lightning and switching in the transmission and distribution systems. Existing circuit-theory based approaches such as the EMTP cannot solve a transient involving non-TEM mode propagation, for example, a transient across an archon and a wave-front transient at a transmission tower due to lightning. Also, the circuit-theory based approach has difficulty solving a transient in a complex medium, such as a transient on a grounding electrode and that on a semi-conducting layer of a cable. Furthermore, the circuit-theory approach cannot be applied if circuit parameters are not known.
Recently, the numerical electromagnetic analysis (NEA) method is becoming one of the most promising approaches to solve transient phenomena that can be solved, with great difficulty, by the existing circuit-theory based simulation tools. The NEA can solve such problems because the NEA calculates Maxwell’s equation directly. However, the NEA requires an enormous amount of computer resources, and the accuracy is very much dependent on the cell size, time step and the analytical space of a simulation.
This keynote speech explains modeling methods of EMTP simulations for lightning surges, and summarizes the assumption and application limit of the EMTP together with calculation examples. Also, a brief summary of the NEA methods and application examples are described. Finally, a comparison of the EMTP and NEA simulations is demonstrated.

Biography of the Keynote Speaker

Prof. Akihiro Ametani was born on February 14, 1944. He received the Ph.D. degree from University of Manchester Institute of Science and Technology (UMIST), Manchester, U.K., in 1973. He was with UMIST from 1971 to 1974, and Bonneville Power Administration to develop EMTP for summer from 1976 to 1981. He has been a Professor at Doshisha University since 1985 and was a Professor at the Catholic University of Leuven, Belgium in 1988. He was the Director of the Institute of Science and Engineering from 1996 to 1998 and Dean of Library and Computer/Information Center from 1998 to 2001. He was the Vice-President of the IEE Japan in 2003. Dr. Ametani is a Chartered Engineer in the U.K., a Distinguished Member of CIGRE, a Fellow of IET, and a Life Fellow of IEEE. He was awarded a D.Sc.(higher degree in UK) from the University of Manchester in 2010.