Introduces the constitutes of low voltage protection system of distributing transformer, analyzes the failure reason, puts forward concrete measures of improving low voltage protective reliability.

介绍了配电变压器低压保护的组成，对故障原因进行了分析，提出了提高低压保护可靠性的具体措施。

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The free chloride concentration distributing in concrete of simulant chloride environment is analyzed, that is chloride diffusion behavior.

分析了模拟氯盐环境中混凝土内部的自由氯离子浓度分布规律，即氯离子的扩散行为。

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With Ultrasonic ct technology (UCT), we can gain velocity distributing, identify location and dimension of abnormal concrete regions, conclude the type of defect and the intensity of defect.

利用声波层析成像技术可以获得测区混凝土的波速分布图，确定异常区的位置、尺寸，推断缺陷的类型、强度。

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