Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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A Study on Evalution of Corrosion Properties in cooling tube of water cooling transformers

수냉식변압기 냉각튜브의 부식특성 평가에 관한 연구

  • Jeong, Nyeon-Ho (KEPCO Research Institute, Engineering Center, E&C Team) ;
  • Min, Byung-Yeon (KEPCO Research Institute, Engineering Center, E&C Team) ;
  • Park, Hyun-Joo (KEPCO Research Institute, Engineering Center, E&C Team)
  • 정년호 (한국전력공사 전력연구원) ;
  • 민병연 (한국전력공사 전력연구원) ;
  • 박현주 (한국전력공사 전력연구원)
  • Received : 2010.08.23
  • Accepted : 2010.10.28
  • Published : 2010.10.01
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Abstract

Most of the thirteen substations in operation in the metropolitan area were installed around the year 2000, and since water cooling methods are used to directly withdraw heat from transformer oils, a stable supply of electric power is required through optimal maintenance of facilities. The water cooling tower installed outdoors, which uses the water supply as sprinkler water, experiences the most problems. Since more than 90% of the cooling water is reused, the dissolved composition in the water becomes concentrated due to long operating hours, and impurities dissolve in the water due to air flowing in from the outside, forming hard scales on the outer surface of the cooling tube, and in extreme cases, reacting with the tube material composition, leading to corrosion. As a result, not only is cooling efficiency lowered, but in extreme cases the cooling tube must be replaced. In this study, the characteristics and composition of the scales formed on the cooling tube were analyzed and corrosion characteristics of material types were identified in order to find an efficient maintenance method for cooling tubes. In addition, the degree of dissolution of various chemicals were investigated during the removal of scales that have been formed.

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References

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