Large Capacity Technologies (Development of High Heat Transmission (HHT) Insulation System)

High Heat Transmission (HHT ®)

[Patent] International Publication No. WO01/016965 [Trademark Registration] Granted

We developed the original insulation system (HHT) that has more than doubled (compared with other Mitsubishi Power products) thermal conductivity of the insulation layer to produce improved stator winding cooling. This advancement has made it possible to apply hydrogen cooled generators in some of the capacity ranges that had used water cooled generators. Moreover, by using HHT in existing generators, it is possible to increase generating output, and improve efficiency through operation under reduced hydrogen pressures.

Flow of Heat from Stator Coils


Verification Testing using Actual-sized Coils

Comparison of Thermal Conductivity
Application in Actual Equipment