The law of differential expansion variation under start/stop and normal operation for GEC Alsthom 600 MW turbine and factors influencing the differential expansion are described. The experience of expansion control is summarized.

• 介绍GECALSTHOM600MW汽轮机启停、正常运行中的差胀变化规律以及影响差胀的变化因素，总结了控制差胀变化的经验。