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| Corrosion Failure of Distribution Automation Terminal in Hot and Humid Environment |
| Received:February 26, 2019 Revised:July 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.07.021 |
| KeyWord:southern power grid distribution automation terminal humid and hot environment corrosion failure protective measures |
| Author | Institution |
| SHI Xun-tao |
1. Southern Power Grid Research Institute Limited Liability Company, Guangzhou , China |
| LI Zhi |
2. State Key Laboratory of Environmental Adaptability of Industrial Products, China Academy of Electrical Appliances Research Limited, Guangzhou , China |
| CHEN Chuan |
2. State Key Laboratory of Environmental Adaptability of Industrial Products, China Academy of Electrical Appliances Research Limited, Guangzhou , China |
| XIANG Li |
2. State Key Laboratory of Environmental Adaptability of Industrial Products, China Academy of Electrical Appliances Research Limited, Guangzhou , China |
| ZHANG Wen-qiang |
2. State Key Laboratory of Environmental Adaptability of Industrial Products, China Academy of Electrical Appliances Research Limited, Guangzhou , China |
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| Abstract: |
| Objective To solve the corrosion failure problem of distribution automation terminal in hot and humid environment, guarantee the safe operation of distribution network automation system, and extend the service life of power distribution automation terminal. Methods Three overhead FTU terminals were selected as the research objects, to study characteristics of corrosion failure of distribution automation terminal in hot and humid environment and develop effective protective measures. The corrosion failure of distribution automation terminal was analyzed by SEM and EDS. Results EDS data showed that the content of oxygen in corrosion region was significantly higher than that of the slight corrosion region, and the presence of sulfur and chlorine indicated that the corrosion environment was mainly a humid environment containing sulfur and chlorine. The surface of aviation plug is covered by two plating layers of nickel and copper. While surface of corrosion sample is not only detected of copper, but also some iron. It meant that the plating was destroyed, the part of the base material was exposed, and the corrosion appeared. Combined with the SEM, it was found that the surface of corrosion products had a great number of coarse particles. The plating was destroyed obviously. Conclusion The corrosion failure of materials is mainly due to the accelerated corrosion of terminal equipment in the atmospheric environment of high temperature, humidity, chloride ion and sulfur, as well as the exposure of substrate caused by damage of plating layer or leakage plating, leading further development of corrosion. Therefore, targeted protection measures are developed according to the corrosion characteristics of the distribution automation terminal in the hot and humid environment. Then, the safety operation of distribution network automation system is guaranteed, and the service life of distribution automation terminal is extended at the same time, and the reliable basis will be provided for future empirical test. |
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