Michael Schueller

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As gas insulated DC transmission systems unite the advantages of space saving installation and big transmission capacity, this technology will become essential soon. The main problem in operation with respect to insulation seems to be identified today, which is charge accumulation on the surface of the insulators, so called spacers. These trapped charges(More)
Stationary DC electric fields are determined by the resistivity distribution of the insulation materials. In the presence of interfaces between different insulation materials, charge accumulation at these boundary layers may have a significant influence on the electric field distribution and with it on the breakdown strength of the arrangement. In many(More)
In the present contribution, we analyze and quantify micro-discharge currents originating from rough electrode surfaces in HVDC gas insulated switchgear (GIS) applications. These currents can be significantly larger than those in the gas phase caused by natural ionization or those from bulk conduction in the solid insulators. They may thus dominate the(More)
Stationary DC electric fields are determined by the resistivity distribution of the insulation materials. In the presence of interfaces between different insulation materials, charge accumulation at these boundary layers may have a significant influence on the electric field distribution and with it on the breakdown strength of the arrangement. In many(More)
Cross-sections for the production of (181)Re, (182m)Re, (182g)Re, (183)Re, (184)Re, and (186)Re from proton bombardment of natural tungsten have been measured using the stacked foil technique for proton energies up to 17.6 MeV. Results are compared with the theoretical excitation functions as calculated by the EMPIRE II code (version 2.19) and experimental(More)
Stationary DC electric fields are determined by the resistivity distribution of the used insulation materials. In the presence of interfaces between different insulation materials, charge accumulation at these boundary layers may have a significant influence on the electric field distribution and with it on the breakdown strength of the arrangement. To(More)
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