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The first low-voltage AC network system is reported to have been installed in Memphis, Tennessee, c. 1907. The network transformers were supplied by primary feeders through distribution cutouts and were connected to a solid grid of low voltage cables that were protected with fuses. In 1921, improvements were made to the basic system in Seattle, Washington by Puget Sound Power & Light Co. This...
Since the 500 kV DC transmission project was put into service by monopolar link in Dec. 2002, noises of the 500 kV main transformers around WuNan increase significantly (about 21 db). This article discussed the impact of ground direct current produced by DC monopolar link upon equipment in AC system. It includes the impact of DC magnetic biasing on transformers and current transformers, the impact...
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