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The desire to decrease electrical loading by using energy efficient lighting has resulted in a high level of attention to replacing conventional incandescent lamps with compact fluorescent lamps (CFL). In Iran from energy management point of view, people are encouraged by ministry of power to use CFLs. Also after elimination of subsidies, the substantial increase in electric energy price resulted...
Application of nonlinear - load especially power electronic devices in power system causes the increase of harmonics content. It causes greatly harmful to the stable operation of power grids, and power systems equipment. Traditional harmonics monitoring system is mainly based on hardware, Because of its simple function; it has a lot of disadvantages. This paper presents a design scheme of harmonics...
Based on the research subject of harmonic pollution of Nanhai in Foshan, a harmonics survey in Nanhai gird is presented in this paper, on which a large number of statistical analysis have been worked. This survey takes almost a year and includes 490 enterprises, 772 distribution transformers at 12 towns. According to inspecting results, it shows that the harmonic pollution in Nanhai city is more severe...
With the rapidly developing of electrified railways, the adverse effects on the public power grid brought by traction power-supply system have been increasingly taken into account by railway and electricity department. In order to analyze the harmonics influence caused by traction power-supply system, the models based on PSCAD/EMTDC of typical traction power-supply system and public power grid have...
With the rapidly developing of electrified railways, the adverse effects on the public power grid brought by traction power-supply system have been increasingly taken into account by railway and electricity department. In order to analyze the harmonics influence caused by traction power-supply system, the models based on PSCAD/EMTDC of typical traction power-supply system and public power grid have...
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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