Investigation of the breakdown process of syntactic foam under lightning impulse stress at liquid nitrogen temperature


In superconducting elements for electrical power distribution networks liquid nitrogen (LN2) based mostly insulation systems are commonly used. LN2 features a cooling and an insulating function simultaneously. One disadvantage of these insulation systems is that the bubble formation inside LN2 thanks to heat losses of the present carrying conductor, which reduces the dielectric strength of the insulation system drastically. An different is a solid insulation system where LN2 mainly takes a cooling perform. This paper focuses on syntactic foam as a solid insulation system for superconducting power elements. Syntactic foam could be a composite material consisting of a polymeric matrix and embedded hollow microspheres. Each epoxy resin and unsaturated polyester resin serve as matrix material. The hollow microspheres' sheath is created from glass or ceramic. Numerous syntactic foam compositions generated from the mentioned materials are investigated regarding their dielectric strengths underneath lightning impulse voltage stresses at liquid nitrogen temperatures (LNT). Plus the experiments, numerical field simulations are administered to perceive the process of breakdown among syntactic foam.

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