Vous êtes ici


SES se considère, en premier lieu, une compagnie de recherche et de développement. Cependant, SES conduit non seulement ses propres recherches mais elle utilise aussi ses propres logiciels afin d'offrir des services de consultation. Cette unique combinaison permet à SES de développer des logiciels toujours de plus en plus puissants. Ainsi SES-EUROPE s'inscrit pleinement dans cette lignée en traitant également ses propres thèmes de recherche.


Les premières contributions de SES-EUROPE

F. Grange, S. Journet, F. P. Dawalibi, S. Fortin and Y. Li

"Investigation of Transient Voltages in a Tokamak Building Hit by Lightning"
7th Asia-Pacific International Conference on Lightning (APL 2011), Chendu, China, November 1 - 4, 2011. 


The ongoing international Tokamak (nuclear fusion) demonstration project (ITER) will be housed in a building supported by a 17 m deep complex seismic isolation pit. This 120 m long and 90 m wide pit will house the anti-seismic foundations of the future Tokamak Complex. Safety to persons in contact with the building and damage to the anti-seismic foundation structures due to repeated lightning strikes is a major concern and must be prevented by adequate lightning bonding and grounding mitigation measures. This paper describes the results of a detailed study of the response of the Tokamak building structures and associated anti-seismic pit foundations structures to lightning strikes. This paper focuses on the transient response and related safety aspects.

W. Ruan, S. Fortin, F. P. Dawalibi, F. Grange and S. Journet

"Transient Ground Potential Rises at a Nuclear Fusion Experimental Power Plant Hit Directly by a Lightning Strike"
7th Asia-Pacific International Conference on Lightning (APL 2011), Chendu, China, November 1 - 4, 2011.


Electric substations are often exposed to lightning strikes. When that happens, very fast large transient voltage stresses occur. Surge limiters can be destroyed and electronic equipment inside control rooms can be damaged. In order to develop appropriate mitigations that prevent such catastrophic damages, a model of a lightning strike hitting a shielding structure of a substation feeding an experimental nuclear fusion facility (Tokamak) is analyzed. Transient Ground Potential Rises (TGPR) of the substation are studied using an electromagnetic field approach. The system analyzed consists of a detailed model of the grounding system of the substation as well as a skeleton of the power plant grounding system. The effects of the soil resistivity on the TGPR are studied. It is shown that the transient GPR increases when the soil resistivity increases. When the soil resistivity is low, there is little difference in the transient GPR between the substation grounding system alone and the substation grounding system interconnected to the power plant grounding system. However, when the soil resistivity is high enough, the interconnected grounding system between the substation and the power plant can significantly reduce the transient GPR in the substation control room in both its magnitude and its extent over time. Consequently, stress voltages on electronic equipment inside the substation control room can be greatly reduced.