Neckarwestheim Nuclear Power Plant
| Neckarwestheim Nuclear Power Plant | |
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Nuclear power plant Neckarwestheim
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 Location of Neckarwestheim Nuclear Power Plant in Germany
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| Country | Germany |
| Location | Neckarwestheim |
| Coordinates | 49°02′30″N 9°10′30″E / 49.04167°N 9.17500°ECoordinates: 49°02′30″N 9°10′30″E / 49.04167°N 9.17500°E |
| Construction began | 1971 |
| Commission date | May 26, 1976 |
| Owner(s) | EnBW |
| Operator(s) | EnBW |
| Nuclear power station | |
| Cooling source | Neckar River |
| Cooling towers | 1 |
| Power generation | |
| Units operational | 1 × 1,400 MW |
| Nameplate capacity | 1,435 MW |
| Capacity factor | 87.1% |
| Annual output | 17,060 GW·h |
Neckarwestheim Nuclear Power Station is a nuclear power plant in Neckarwestheim, Germany, sometimes abbreviated GKN (for German: Gemeinschaftskraftwerk Neckar), operated by EnBW Kernkraft GmbH.
Block I, in service since 1976, carries a nominal electrical power of 840 megawatts. The 50 Hz three phase AC power is 567 megawatts and for the 16.7 Hz traction current power 174 MW. The traction current generator is the world's largest single-phase AC generators. The generator block 1 is rated 21,000 volts at a current of 27,000 amperes, and the traction current generator is rated 14,500 volts and a current of 12,000 amperes. The current produced by the generators is stepped up to 220 kilovolts (three-phase alternating current) or 110 kilovolts (single-phase traction current) with the unit transformers. Block I was the only nuclear power station which produces traction current. Block I was shut down on March 17, 2011 for a three-month moratorium on nuclear power, an announcement on May 30, 2011 named block I as a unit that would not be returning to service.
Block 2, in service since 1988, has a nominal electrical power of 1400 megawatts. The generator produces 50 Hz three-phase alternating current with a voltage of 27,000 V and a current of 35,000 amperes. Unlike Unit 1, no dedicated traction current generation takes place, but some of the power produced is converted at the traction current substation. This is transmitted through the 380 kV generator transformer block of the II and the 380 kV-machine transformer of the motor-generator sets.
The GKN station has a 16.7 Hz traction current converter plant. It is close to the switchgear of block II, has two identical sets, consisting of a three-phase 50 Hz AC motor with 12 poles and a four pole single phase 16.7 Hz AC synchronous generator. The rated voltage of the three-phase AC asynchronous machine and the traction current machine is 12.5 kV. The set has a length of 17.5 meters and a maximum width of 7 meters. The nominal power rating for each set is 70 megawatts, which are the largest traction current motor-generator sets ever built. It feeds the 110 kV balanced line traction power network through appropriate transformers. Power can be transferred from the Block II nuclear generator over the 380 kV transmission network.
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