Abstract: Abstract:The main equipments of Togtoh Power Generation Company Limited were introduced. The reasons of auxiliary power outage accident were analyzed. The situations of the units after auxiliary power failed and the influence of the accident on normal operation were summarized. The treatment measures after the auxiliary power failed and the recovery steps of electrical devices were expounded. The result in this paper ensures to give correct direction for accident treatment, to enhance ability of quick response and emergency treatment and to minimize the losses caused by the accident.

Key words: Key words:auxiliary power outage, accident treatment, power unit stop, prearranged plan