发电机设计（一次）与继电保护（二次）工作的分离，存在发电机安全运行的隐患。
The separation of generator design (primary) and protection (secondary) can produce the hidden trouble in safe operation of generator.
通过对离心式水泵高效工作区的性能曲线进行二次拟合，分析了离心式水泵机组并联调速运行特性。
The parallel-connection and variable-speed operation characters of the centrifugal pump groups are studied by conics fitting of the character curves in the high efficiency area.
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