Research On Evaporative Cooling System Of SCR Commute Circuit

The paper studied the evaporative cooling system of SCR commute circuit in theory and experiments. The main component in the commute circuit is controlled silicon rectifier. The controlled silicon rectifier is a kind of electric and electron component and the mostly component of it is thyristor. During the working, thyristor will produce a great quantity of heat. So, the central problem of this article is cooling. As an electric and electron component, the application field of thyristor is very wide. To these days, in the fields of direct current transfer, reactive power compensator, etc, thyristor still play an important role. Thyristor is a high-power semiconductor device, and the standard of its rated current is temperature. So, the study of cooling is a matter of great significance.Firstly, the article stated the wide application of evaporative cooling technology. Enumerated some achievement on the application of large electrical equipment in resent years. From these, we'll found the excellent future of evaporative cooling technology. Secondly, discussed the selection of coolants. By comparing the different character of coolants, which used on the electrical equipments and newly developed ones, and analyzing the cooling condition in commute circuit, Rl 13 was chosen for the research.Thirdly, the article analyzed the impossibility of the evaporative cooling system of commute circuit and the importance of presser regulation system. After that, the evaporative cooling commute circuit system was build-up. The temperature of thyristor and the thermal resistant between thyristor and air was calculated. The corresponding parameter was compared in different cooling system. At last, we'll find the cooling effect of evaporative cooling system is excellent. Evaporative cooling is the best cooling style for large electncal equipment.