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This paper describes the design, construction and testing of a protective electrical system which is an effective and reliable solution for blocking the DC current in the neutral of grounded “Y” configured power transformers. The blocking design uses sensors and electronic controls to automatically remove a metallic grounding path, leaving a capacitive blocking device in the transformer neutral connection...
This paper investigates a method to minimize the flow of geo-magnetically induced currents (GIC) through power transformers. The solution examined was an AC grounding path provided by a capacitor between the earth ground and the neutral point of a power transformer only when GIC was detected. The effectiveness and problems of this approach were investigated through simulation of a 765 kV transmission...
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