OREANDA-NEWS. Mitsubishi Electric enhanced cooling performance in the VP-X by improving main insulation and cooling gas ventilation without incorporating a water-cooling system for the stator winding. Until now, all large-capacity turbine generators in the 900 MVA class have relied on water-cooling.

Mitsubishi Electric's VP-X also boasts a simplified design that will help improve the appearance of power plants, as well as lower the requirements for maintaining and operating turbine generators. The overall size is 20% smaller than conventional indirectly hydrogen-cooled generators. In addition, both the footprint and frame diameter are smaller, making transportation easier. Elimination of a water-cooling system for the stator winding helps to simplify maintenance. Also, needs for manual inspection have been reduced through a partial discharge monitoring system that incorporates a microstrip antenna for continuous monitoring of the main insulation and an inspection robot.

In addition, a new parallel-manufacturing method for the stator core and stator frame shortens delivery time.