By introducing the structure and function of testing unit, this paper makes user understand the theory of the system further, and provides guidance to the operation and maintenance.
通过介绍测试装置的组成和功能，让使用者从理论上进一步了解该系统，以指导该装置操作和维护工作。
Structure design for easy operation and maintenance: The unit with compact structure is required less space for repairing and is accessed in front for maintenance.
机组结构紧凑，只需很小的维修空间及地面空间，全正面维护。
But there are still many problems in the safe operation and maintenance management, such as the disturbances of commission and maintenance to the unit operation.
但这种集控模式在安全运行和检修管理方面存在一些问题，如容易走错间隔、调试和检修工作对运行机组造成干扰等。
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