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CONTACTOR SWITCHED APFC SYSTEMS

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CONTACTOR SWITCHED APFC SYSTEMS 1
Power Quality Management• Available

CONTACTOR SWITCHED APFC SYSTEMS

ENGINEERING DESCRIPTION
Shreem Electric's LVAS-C is an auto switched, contactor based power factor correction system for low voltage networks, designed for automatic PF correction in variable industrial loads such as AC/DC drives, furnaces, cement and paper mills, steel, oil and gas, water and sugar industries, and distribution transformers feeding commercial loads. The panel works at 415 V, 440 V, 550 V or 660 V, 50 Hz, and is built in a powder coated metal cabinet for indoor or outdoor use (IP40/55) with natural or forced ventilation, top or bottom cable entry, and an MCCB, ACB or SFU incomer. An intelligent power factor controller with 1 CT or 3 CT sensing and parameter display manages the switching, and the 3 CT version offers data downloading. Capacitor steps are switched by capacitor duty contactors (AC6b duty) fitted with damping resistors, which greatly reduce inrush current compared to standard AC3 contactors, while low wattage free wheeling resistors across the series reactor reduce insulation stress on components. The system can be supplied with all polypropylene (APP) film and foil capacitors (IS 13585) or metallised polypropylene (MPP) capacitors (IS 13340), along with 0.2%, 7% or 14% reactors (IS 5553) for inrush limiting or detuned operation. Panels are available in compartmentalized and non-compartmentalized designs, comply with IEC 61439 Parts 1 and 2, IEC 61921 and IS 8623, and come in standard sizes from 150 to 800 kVAr, with custom sizes and ratings possible on request.

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