The Gas Insulated Switchgear (GIS) is intended to be both maintenance free and inspection free, inhibiting the affects of the external environment by sealing the main circuit equipment with SF
6 gas in a tank. Once an abnormality occurs inside it, however, it may develop into a major malfunction. Therefore, it is necessary to develop the fault locating technique.
In this paper, we present the fluorescent plastic optical fiber system for a way to detect a fault location in the GIS, and we examined the system reliability using a full scale GIS.
The sensitivity of the fluorescent plastic optical fiber is considered to be influenced by structure of the GIS, decomposed material of SF6 gas deposited on the fiber surface, and other environmental conditions. We conducted reliability tests against these factors. We conclude that under the normal field condition, we can practically locate 100A fault current, if faults occur somewhere in the units of GIS, even inside the current breaker units.
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