非计划停运，指不在正常计划内的停止某项活动或者班、列车或者航班。非计划停运的原因也常常是发生不可抗力的自然灾害，不会出现较大的事故，但会带来诸多不方便。
据对全国电力系统运行中的事故类型统计分析，断路器引起的非计划停运次数最多。
According to the statistical analysis of the accidental types in the operation of electric power system, the time of unplanned outage of electric power system caused by the circuit breaker is most.
及早发现锅炉的轻微泄漏对避免机组非计划停运、缩短检修时间具有非常积极的意义。
To discover the minor leakage in boiler on time is significant to avoid unscheduled downtime of power unit and minimize maintenance period.
发电容量的退出是为了计划维修或计划停电，或者偶然由于非计划或强迫停运。
Generating capacity is taken out of service for scheduled maintenance or planned outage and is occasionally lost on an unplanned or forced outage.
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