The advantages of shell form split winding type power transformer against short circuit trouble are analyzed, and one of the ideal path to solve this problem is pointed out by the use of shell type structure. 分析了壳式结构启动备用变压器在抗短路能力方面的特点,说明了采用壳式结构是提高发电厂用启动备用变压器抗短路能力的理想途径之一。