700-m 400-MW Class Ultrahigh-head Pump Turbine

Abstract

OVERVIEW: The first unit of the world-leading ultrahigh-head pump turbine was commissioned in December 1999 at the Tokyo Electric Power Company (TEPCO)’s Kazunogawa pumped-storage power plant in Japan. This paper describes several state-of-the-art technologies applied to the hydraulic and mechanical designs, which ensure the pump turbine’s high reliability and stable operation. Kazunogawa; vertical Francis-type single-stage reversible pump turbine, turbine head 728 m, output 412 MW, maximum pumping head 779 m, speed 500 min-1. Kozo Ikeda Morihito Inagaki Kazuo Niikura Katsuhiro Oshima