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The distribution power transformers with amorphous alloy cores are used to employing the core type structure since they were developed, which results in higher noise level and poorer short circuit withstanding ability. To explore the countermeasures for above challenges, the shell type power transformers with amorphous alloy cores are presented. A new type of clamp is designed to withstand the huge...
Decades of experience in underground substations indicated that the traditional cooling technologies have their own shortcomings. Therefore, a novel Oil-Evaporative liquid cooling technology is presented. This new cooling technology could be considered as a two-step cooling system, which could effectively transport heat energy from thermal sources underground to radiators on the ground by phase changing...
As the increasing demand for large capacity, high voltage and high reliability power transformers in urban power grid, oil-free, non-flammable and non-explosive equipment is recommended. For this reason, evaporative cooling transformers, gas insulated transformers and other electrical equipment using fluorocarbon as coolant and dielectric have been developed. This paper presents an experimental survey...
Thermal stress is one of the major causes of deterioration of insulation material for power transformers. An efficient cooling system is important to keep the operating temperature at lower levels. In shell-form transformers, the insulation structure plays an important role in not only insulation but also cooling efficiency. It is known that insulation of shell-form transformers is barrier insulation,...
Although the amorphous alloy core power transformers have the advantage of lower core loss, the high noise level and weak short-circuit strength are inevitable. To explore the countermeasures for noise decreasing, an amorphous alloy core model was employed for detailed experimental study. A large number of noise measurements (A-weighted sound pressure level) were implemented by changing magnetic flux...
Evaporative cooling power transformers with perfluoro-carbon as coolant and dielectric is a new kind of power transmission and distribution equipment. To lay the foundation for safety operation and maintenance, as well as fault diagnosis, an overheating experimental model of perfluorocarbon in the two-phase flow was designed, the decomposition products were analyzed by means of gas chromatography/mass...
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