transformer drying methods

例句：

1. 1. The transformeris used to convert AC power into DCpower.
   变压器用于将交流电转换为直流电。
2. 2. The transformer was designed to improvethe efficiency of the electrical system.
   变压器的设计目的是为了提高电气系统的效率。
3. 3. Thetransformer is essential formaintaining the stability of the electricalgrid.
   变压器对于维持电网的稳定性至关重要。