Winding Diagnostics and High Voltage Technology

Energy - Power Generation Jürgen R. Weidner Generator Engineering Mülheim E F PR GN QM AE Page 1 of 1

C:\Documents and Settings\weidn00j\Local Settings\Temporary Internet Files\OLK381\Improved distance ring design_1110.doc 19.11.10 14:19:50

Improved Design of Copper Lead Distance Ring at Direct Hydrogen Cooled Generator Terminal Bushings Type EKMI 24,5 GC-100 At improper brazing joints (red arrows), which fix the distance ring to the copper tube, some cracks were found at this type of bushing at a maintenance stand still.

For new bushings the design has been improved in September 2010 by Siemens and HSP as shown below. The distance ring is now inherent part of the copper flange and no brazing joints to the ring are needed any more. Nothing else has been changed at this well proved bushing design.

Old Design New Design

J. R. Weidner Mülheim a. d. Ruhr, 2010-11-19