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Aimed at the overvoltage trouble of electric equipments in 500 kV GIS substation caused by lightning strikes to overhead line, four protection solutions were proposed. Through ATP simulation, the protection margins and economy of the protective devices such as transformer, reactor, CVT and GIS-inlet were estimated. It is concluded that installation of a set of outdoor type surge arrester at line inlet...
Partial discharge (PD) signals character analyzing and interference suppressing are very important for PD on-line measurement. In this paper, chaos theory is introduced in the PD on-line monitoring. The mechanism of PD phenomena has been researched by series of typical insulation defect PD experiments in the lab. Through calculating the non-linear dynamics character of PD detecting signal time sequence,...
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