简述了机组在线状态监控系统的基本功能与应用情况，以及对故障诊断系统进行改进和完善的方法。
The basic function and applicating condition of on_line monitoring system is briefly described. Improvement and perfection are carried out on trouble diagnosis system.
最后提出了防止航空三相电动机过热与起火的方法，包括采用电机在线状态监控、主动维护、增加有效的保护装置等。
Several measures are put forward to prevent the motor from overheating and catching fire, including online monitoring the motor status, maintaining actively and adding effective protection devices.
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