Huaming Cao

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Islanding detection is an important issue for distributed generation operating with main network. To solve the problem of reliability and sensitivity of conventional vector shift method, this paper presents a composite islanding detection method utilizing both angle change and frequency variation derived from distributed generator terminal voltage. The(More)
This paper discusses electric field under overhead lines with a nearby building. Surface charge method is used. Planer triangle surface charge element is chosen. Electric potential and electric field strength produced by a planer triangle surface charge are presented. And analytical expression is deduced. Then electric field of 220kV double circuit overhead(More)
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