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Hello Muthu, 76°C is at full load operation and if I remember correct,the inlet air temp. is plus 50 °C. As I thought, increasing the air ducts in middle might cool the core more effectively, but this was way too much cooling at middle. Is there any solution to fix this problem...apart from...

Hello Muthu, The laminations for 2 machines were from same vendor, so I guess there is no change in lamination grade.. Please find attached file for core stacking...... I am just thinking about plugging some air ducts at the middle of core, so that the temp. rises at middle and comes more...

Hello Tony, Yes, same OEM for both machines, (winding RTD's are sandwiched between lower and upper bar), core RTD's are embedded and the laminations are in good conditions, completly new stator... Arun.

We have two 35MW air cooled, closed type hydro generator. The first machine with equal core packet height. During full load the core temp is 15°C more at middle than the core ends.(middle of the core is hot compared to core ends top and bottom). The second machine with varying core packet...