Abstract
In this paper we introduce a newly developed measuring system for partial discharges (PD) in after-laying tests on site for a long-distance gas insulated transmission line (GIL) in a tunnel. We evaluate the length of harmful particles for the overvoltages to be considered for the Shinmeika-Tokai GIL. The length ofparticles detectable by the PD sensors is compared with the length of harmful particles. The highly sensitive PD measuring system took advantage of low noise levels in the tunnel. We applied the system to the after-laying test on site and confirmed that the developed system was effective to verify the required performance of a long distance GIL in a tunnel.
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