Fixed-speed pumped-storage motor-generators up to 525 MVA
Fixed-speed motor-generators are reversible synchronous machines for pumped-storage power plants.
- Type
- reversible synchronous machine, salient-pole rotor, DC excitation
- Power (supplied)
- up to 525 MVA
- Kannagawa
- 525 MVA
- Kazunogawa
- 475,000 kVA, 500 rpm
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Fixed-speed motor-generators are reversible synchronous machines for pumped-storage power plants. In generator mode the machine produces electricity from the pump-turbine; in pump mode it operates as a synchronous motor and drives the pump-turbine to pump water into the upper reservoir. This is a direct functional analog of pumped-storage motor-generators. Design. The vertical machine has a stator with a three-phase winding, a salient-pole rotor (rim, poles with cores and coils), upper and lower spiders with bearings, and a shaft with slip rings for DC excitation. For starting in pump mode a static starting converter (SFC) and a reversing phase disconnector are used, which the manufacturer supplies as part of the station’s auxiliary equipment. Experience. In 1959 the first reversible unit was commissioned at the Omorigawa pumped-storage plant: a Francis pump-turbine and a 14,000 kVA motor-generator at 400 rpm. In 1969 one of the founding companies supplied 100,000 kVA motor-generators (277 rpm) for the Takane Daiichi pumped-storage plant. In 1999–2000, 475,000 kVA motor-generators at 500 rpm, the largest in Japan at the time, were commissioned at the Kazunogawa pumped-storage plant. A 525 MVA fixed-speed machine was installed at the Kannagawa plant. The 350 MVA motor-generator of the Okutataragi plant was converted in 2018 from fixed to adjustable speed. Features: during modernization, fixed-speed machines may be replaced with adjustable-speed machines having a cylindrical rotor and AC excitation. PEEK-coated bearings and TEHD thrust bearing calculation are used. Applications: high-power pumped-storage plants, modernization of existing units, and complete supplies with pump-turbines by the manufacturer. Geography of generator supply by the manufacturer and the founding companies: Japan — more than 33,000 MVA; North America — more than 8,000 MVA; Latin America — more than 13,000 MVA; Europe, the Middle East and Africa — more than 3,000 MVA; Asia and Oceania — more than 19,000 MVA.
Technical specifications
| Type | reversible synchronous machine, salient-pole rotor, DC excitation |
|---|---|
| Power (supplied) | up to 525 MVA |
| Kannagawa | 525 MVA |
| Kazunogawa | 475,000 kVA, 500 rpm |
| Okutataragi (before modernization) | 350 MVA |
| Takane Daiichi (1969) | 100,000 kVA, 277 rpm |
| Omorigawa (1959) | 14,000 kVA, 400 rpm — first reversible unit |
Request a price and lead time
Fixed-speed pumped-storage motor-generators up to 525 MVA. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
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