Frekvenční měniče Katalogy, manuály (EN+CZ)

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

Strana 811 z 825







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. all cases, the performance these high-speed drives has been excellent and they are operating the full satisfaction the users. Drives for applications hazardous areas have been constructed meet the corresponding standards and have been certified authorities following extensive testing the works. Both supply and machine converters usually operate 12-pulse mode and most are equipped with water- cooled thyristors. High-speed drive applications • compressors for drives gas and chemicals • boiler feed pumps power plants • drives for test bays Advantages • gears and therefore higher reliability and availability • reduced length shaft train • much improved drive efficiency • low maintenance costs High-speed synchronous motor driving boiler feed pump power plant Continuous rating: 10 MW Speed range: 5 0.High-speed synchronous motor drives The maximum possible speed directly connected two-pole synchronous motor on a system 3000, respectively 3600 rpm.5 and they operate speeds to 6500 rpm. Higher speeds can obtained from two- pole motor inserting frequency converter in the motor supply which applies frequencies higher than the power system frequency to it. The only difference the higher output frequency which can as high 125 Hz.. They are used mainly for driving boiler feed pumps power plants and large compressors gas and chemicals and various kinds test bays. Proven converter design The LCI converter used supply variable voltage and frequency high-speed synchronous motor basically the same as those already described for operation at normal speeds. The maximum speed possible for a synchronous motor this kind arrangement varies with power rating, but cannot exceed about 7500 rpm due the constraints the rotor and exciter design (see diagram on page 4).5 to 41. 12 . 5222 rpm Short-time rating: 13 5700 rpm High-speed drive references Since the first high-speed synchronous motors with LCI frequency converters went into service the beginning the 80’s, ABB has installed more than with total power of about 700 MW. The individual power ratings range from 2