Dr.-Ing. Hermann Koch is Director of Standards and Regulations of the High Voltage Technology at Siemens. He graduated in Industrial Control Engineering at the Fachhochschule Rüsselsheim and in Electrical Engineering at the TU Darmstadt in 1979 and 1986, respectively, after also studying at New Jersey Institute of Technology, Newark, New Jersey, USA. In 1990 he received his Dr.-Ing. degree from the TU Darmstadt. Since 1991 he is working with Siemens High Voltage Division in different responsibilities.
Hermann Koch is Chairman of the IEEE PES Substations Committee. In IEC he is Secretary of SC 17C High Voltage Switchgear Assemblies, and in CIGRE member of the Strategic Advisory Group of SC B3 Substations. He has published more than 130 technical papers and holds 31 patents in the field of gas insulated technology, his area of expertise. He is engaged in studies, innovations, and R&D activities for high voltage gas insulated power transmission systems.
With the increase of wind and solar energy generation, the need of strong transmission lines for power exchange between regions will increase. New transmission routes are required and existing will need up-grading. The gas insulated line can offer solutions
when underground transmission is needed. This tutorial gives basic theoretical information on the gas insulated technology for the design and physical layout. The historical development of GIL product design, insulating gases, laying options, testing, system
and network requirements, environmental impact, economical aspects and examples of practical applications are content of the tutorial. Mile stones of applications like the first 400 kV GIL in Schluchsee, Germany from 1975, the first gas mixture GIL at Palexpo, Geneva, Swiss in 2001 and the first gas mixture insulated and directly buried 400 kV GIL at Kelsterbach, Germany in 2010 are explained in detail.