Frekvenční měniče Katalogy, manuály (EN+CZ)

| Kategorie: Katalog  | Tento dokument chci!

Vydal: ABB s.r.o, ELSYNN Autor: ABB ELSYnn

Strana 810 z 825







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• Closed-circuit: The cooling air circulates closed circuit inside the converter cubicles. Water-cooling Deionised water flows closed-circuit through the thyristor heat sinks and around the snubber circuit resistors and cooled by either water-to-water water-to-air heat exchanger. The advantages air cooling are: • simplicity • overload capability for short duty cycles • permits converters installed where cooling water not available. The advantages water cooling are: • space-saving layout • losses easily conveyed from control room • higher ambient temperature permissible • less noise • fully enclosed cubicle with protection class IP55 (protection against dust and splash water) for noise reduction and severe ambient conditions available Air-cooled MEGADRIVE-LCI driving a boiler feed pump a nuclear power plant Rated power: 3. The air the closed cooling circuit cooled by air-to-air air-to-water heat exchanger. This method necessary plants with dusty and/or aggressive atmospheres. This method necessary for high­ power applications and plants with dusty and/or aggressive atmospheres. Circulation pump, monitoring devices for flow, temperature and conductivity are part the converter assembly.Efficient cooling means higher reliability Air-cooling • Open-circuit: Fans force the cooling air through the thyristor heat sinks. All components are wired and the system tested the works prior delivery which considerably reduces the time required for erection and commissioning site. 11 . cooling water pipes have be disconnected drained order replace a thyristor. This method suitable plants with clean air conditions.4 MW Operating mode: 12/12-pulse Walk-in enclosure For outdoor erection, the converter complete with auxiliaries, switchgear, reactors and air- conditioning plant can installed fully sealed enclosure which can supplied for varying severities ambient conditions