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Group-type transformer has poor ability withstand DC bias, which causes transformer local overheating, increases vibration, noise and other adverse reactions. The internal characteristics of group-type transformer DC bias are analyzed in this paper. Pointed out what it is increased with the increase of DC that harmonic of excitation current and frequency. With different DC bias current, the variation...
Recently years, UHVDC transmission system is paid more attention to in the field of China's power system. It takes key part in the tactic of China electrical power development. But, many problems caused by UHVDC system, such as DC bias, corrosion of metal underground and so on. DC flows through the neutral point and causes DC bias of transformer, as well as some other problems, such as vibrations,...
The on-line monitoring of high voltage equipment is an important technique to ensure the safe of electric power transmission. And the key of the technique is the detection of divulge current. At first, the error of the current transducer is analyzed. Then a type of low current transducer with cored structure and high accuracy is described which is specially designed for on line monitoring of high...
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