Frekvenční měniče Katalogy, manuály (EN+CZ)

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

Strana 809 z 825







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A high basic insulation level inside the cubicles minimises the risk short-circuits. Special designs are available kV. Special enclosures and proofing are available comply with higher protection classes. . The series connection thyristors or thyristor bridges (e. The advantages high system voltage are: • reduced losses because the higher power achieved with less current • better cost/benefit ratio for the motor • cheaper cables with lower cable losses • fuses can avoided. Converters for higher ratings are broken down into suitable units for shipment. The advantages modular construction are: • compactness and robustness • fast erection site • adaptability the customer's needs • ease maintenance • simple replacement components • easy handle and ship High voltage for high power At the lower end the power range, single thyristor per branch usually sufficient. The standard DIN enclosure protection class is IP30 for water-cooled converters and for air-cooled converters. for 12-pulse operation) has thus become standard practice for converters with voltage ratings kV. For powers MW, all the modules are mounted common base frame and fully Water-cooled MEGADRIVE-LCI Rated power: MW 10 metal clad and are shipped single unit.Converter design and cooling Part water-cooled thyristor stack Compact and modular The main components converter are: • thyristor stacks with thyristor heat sinks • snubber circuits • gate control units with either magnetic or optical fibre transmis­ sion the control impulses • semiconductor supervision devices • reactors • current and voltage transformers • fans the case of air cooling • cooling unit with heat exchanger and pumps the case of water cooling • control and protection equipment • excitation system • local control panel Both the power and control sections the converter are constructed modular units. Higher powers are generally achieved by connecting thyristors series divide the voltage rather than parallel share the current.g