SL150 — cycloconverter, 1.5–4 kV, 2.8–40 MVA for high-power low-speed drives

Description

SL150 is a cycloconverter (a direct thyristor frequency converter) for low-speed drives with high torque in metallurgy, mining and heavy industry. The technology has been improved for more than three decades and provides maximum availability, robustness and efficiency in the most severe conditions; it is ideal for retrofitting existing drives. The cycloconverter converts the grid voltage directly into a reduced-frequency voltage without an intermediate DC link, which is optimal for very low rotational speeds at high torques. The output voltage is 1.5–4 kV; the power is 2.8–19.4 MVA in the air-cooled version and 12–40 MVA in the water-cooled version. The maximum output frequency is about 44 % of the supply grid frequency. Control is vector control for synchronous and asynchronous motors. The degree of protection is IP21 for air cooling and IP00/IP54 (in an E-house) for water cooling. Four-quadrant operation provides regenerative braking. Efficiency reaches 99 %, and availability exceeds 99.5 %. The converter is simple to control, requires practically no maintenance, is convenient to service and integrates easily into the plant. The manufacturer calls it “tougher than all the others”. SL150 works well in the drives of roll stands of rolling mills, mine hoists, crushers and excavators; it drives large rolling mills, mine hoists, cruise ship propulsion units and powerful material handling mechanisms in the mining and cement industries. It is usually applied together with the low-speed synchronous motors of the manufacturer (HV RM rolling, HV CW torque, HV SM ring). Lifecycle service, modernization and Inspire IQ monitoring are offered. In total, the manufacturer has sold more than 30 000 medium-voltage converters with power from 100 kW to 100 MW, with built-in redundancy and global service support.

Technical specifications