Title :
Corrosion in HVDC valve cooling systems
Author :
Jackson, P.O. ; Abrahamsson, B. ; Gustavsson, D. ; Igetoft, L.
Author_Institution :
ABB Power Syst., Sweden
Abstract :
Stainless steel couplings in the main cooling water pipes of HVDC thyristor valves have been in use since 1983, with an overall satisfactory behavior. However, some water leakage due to corrosion below the sealing O-rings of the couplings was observed during 1992. An extensive investigation and follow-up worldwide showed a direct correlation between water quality and the corrosion rate of the stainless steel couplings. Recommendations are given about actions to be taken in order to maintain a long lifetime for the fine water systems
Keywords :
HVDC power convertors; cooling; corrosion; seals (stoppers); stainless steel; thyristor convertors; HVDC valve cooling systems; accelerated corrosion; cooling water pipes; corrosion; dissolved oxygen removal; electrolysis; fine water systems; polypropylene couplings; sealing O-rings; stainless steel couplings; water leakage; water quality; Cooling; Corrosion; Couplings; HVDC transmission; Heat pumps; Steel; Structural rings; Thyristors; Valves; Water heating;
Conference_Titel :
Transmission and Distribution Conference, 1996. Proceedings., 1996 IEEE
Conference_Location :
Los Angeles, CA
Print_ISBN :
0-7803-3522-8
DOI :
10.1109/TDC.1996.545931
