Title :
Loading capability of HVDC transformer bushings with restricted oil circulation for use in HVDC valve halls
Author :
Johansson, L. ; Magnuson, B. ; Riffon, P.
Author_Institution :
ABB Components AB, Ludvika, Sweden
fDate :
7/1/1993 12:00:00 AM
Abstract :
The loading capability of a 500 kV high-voltage DC (HVDC) transformer bushing is calculated with some unusual conditions: the internal oil circulation in the bushing is blocked at the flange level and the ambient air temperature is raised to 60 degrees C. The theoretical model was verified with a full-scale heat run test on a 7.8 m long bushing. A 220 m/sup 3/ insulated test chamber was required to enclose the test set-up.<>
Keywords :
DC power transmission; bushings; electric breakdown; insulation testing; load (electric); power transformers; transformer testing; 500 kV; 60 degC; 7.8 m; HVDC transformer bushings; ambient air temperature; flange level; insulated test chamber; loading capability; power transformers; restricted oil circulation; testing; valve halls;
Journal_Title :
Power Delivery, IEEE Transactions on
