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Gas Insulated Switchgear (GIS) has been in use in transmission system for more than 30 years with good reliability. However, in our case study of 631 CB-bays of GIS operating under tropical conditions, we observed failure rates over twice the value reported in the 3rd CIGRE's survey of 2007. Following this observation, it becomes practically important to develop a condition assessment model for GIS...
Many methods have been developed to justify the condition of power transformer; one of the newest and well known is by using sweep frequency response analysis techniques. The basic concept of this method is by injecting a constant-amplitude of sinusoidal signal under various frequencies (sweep). The current result then compared to the former frequency response (under normal condition) to evaluate...
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