Briefs the protection for underexited out of step as for BSB-2,and rotor overvoltage protection as for HCK and ASLG,and whose theorem,application and reform.

• 对BSB-2型低励磁失步保护和HCK型、ASLG型转子过电压保护的原理、运用及改进作简要的介绍。 图4