水电厂的维修日益趋向于从定期检修转变到按发电机组的工况维修。利用在线数据采集和分析，可以对各部件目前的工况作出连续评估，因而大大降低检修费用和工作量，并能早期探测到偏离正常运行状态，以便采取适当对策。此外还介绍了一个诊断系统的实例。 Maintenance of hydropower plants increasingly tends to shift from regular maintenance to generator maintenance. With on-line data acquisition and analysis, continuous evaluation of the current condition of each component can be performed, greatly reducing maintenance costs and workload, and detecting deviations from normal operation early in order to take appropriate countermeasures. An example of a diagnostic system is also introduced.