《企业供电系统及运行》是中等职业技术学校电工类专业课程,是学生今后从事电工,尤其是变电运行电工职业之前的必修课。这门课对培养学生的逻辑思维,提高学生分析问题与解决问题的能力有十分重要的作用,并为学生将来解决工厂实际问题作好必要的理论准备。我们在教学中却发现,学生学习这门课程的难度偏大,教师难教,尤其在涉及高压开关的结构、灭弧原理以及短路电流计算等方面,教学效果不太理想。究其原因,一是 “Enterprise Power Supply System and Operation” is a secondary vocational and technical school electrical engineering courses, students in the future to engage in electrical, especially electrical substation operation required before the class. This course has a very important role in cultivating students ’logical thinking, improving students’ ability of analyzing and solving problems, and provides the necessary theoretical preparation for students to solve practical problems in factories in the future. In our teaching, we found that students’ difficulty in learning this course is too large and teachers are hard to teach. The teaching effect is not ideal especially in the structure of high-voltage switch, the principle of arc extinguishing and the calculation of short-circuit current. The reason, one is