Renewable Energy
Palinpinon geothermal power plant, Valencia, Negros Oriental, the Philippines, produces a combined output of 192MW. The site comprises two power plants, the first containing 3 x 37.5MW generators and the second containing 4 x 20MW generators. Demand for electricity in the local area is high, with the site operating at full capacity and therefore it is essential that the generators are properly maintained and operating at their maximum potential.
Fig. 2. The project to overhaul one of the Fuji 37.5MW generators required careful planning to ensure the minimum of disruption.
the stator was sprayed with anti-track varnish. Meanwhile, the rotor was also stripped and cleaned before being tested along with the retaining rings. Non- destructive testing (NDT) methods were used to check the integrity of all of the components before the cleaned rotor coils were replaced and the finished rotor was again sprayed in anti-track varnish. Te redesigned stator coils used the latest in insulation technology, which, compared with 30 years ago, allows a reduced thickness of insulation to be used while still providing the required safety margin. Tis meant that the volume of copper used to make the new coil could be increased, which enabled the output of the generator to be increased from 37.5MW to 40MW – an improvement of over 6%, which will contribute toward satisfying the local demand for electricity. Modern insulation technology allows for thinner layers that can withstand greater dielectric stress and higher temperatures, which also allows more space for copper within the same slot area. Tis reduces the resistance of the stator
winding, which also runs cooler, allowing a small increase in output. By purchasing raw copper and using its
own in-house annealing process combined with automatic shaping machines and computer controlled heated presses, the high-voltage coil production facility can deliver consistently high quality coils.
Fig 3. The stator core was completely stripped, cleaned and tested before the new coils could start to be inserted, blocked and braced.
Te 24-hour production capability enables short delivery times. Coils can quickly be dispatched to any location worldwide, ready for installation. l
Sulzer Rotating Equipment Services, Birmingham Service Centre, Birmingham, UK.
www.sulzer.com
www.engineerlive.com 37
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