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When traveling wave analysis based on Marti model are employed for transient analysis, frequency-dependent line parameters are taken into account, so that calculating results would be more accurate. On the basis of original parameters provided by State Grid Corporation, Marti model of the 1000 kV UHVAC power transmission demonstration project are built in this paper. The transient characteristics...
What this paper study is the influence of electric locomotive loads to three kinds of pickup unit of microcomputer relay protection. A model is constructed by EMTDC/PSCAD, containing typical power grid and three kinds of pickup unit of microcomputer relay protection. The influence degree by electric locomotive loads to the phase abrupt current pickup unit, the phase-phase abrupt current pickup unit...
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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