closed core type transformer

例句：

1. 1.The closed core type transformer is widely used in industrial power systems.
   封闭式铁心变压器在工业电力系统中被广泛使用。
2. 2. The closed core type transformer is an important component of the power system.
   封闭式铁心变压器是电力系统的重要组件。
3. 3. The closed core type transformer has a high efficiency and low loss, which makes it widely used in various fields.
   封闭式铁心变压器具有高效率和低损耗，因此被广泛应用于各个领域。