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Vacon solutions for MV motors

Vacon has introduced a perfect solution for controlling medium voltage AC drives with low voltage frequency converters and standard transformers.

Frequency converters designed for medium voltage motors (3.6, 6 or 10 kV) are typically expensive and need a lot of space for assembly. In addition, there are few medium voltage drives available for lower power ratings such as 250 or 800 kW. Still, motors with those power ratings are fairly common in water and wastewater plants; also district heating plants use these for the main feeder pumps.

Controlling the flow by throttle is inefficient. A more efficient alternative is available: adjusting the speed of the motor by changing the supply frequency. The Vacon solution builds on the use of low voltage frequency converters and standard transformers. The transformers can be of dry-type e.g. cast resin or vacuum die cast or of oil-immersed type.

Benefits of the Vacon solution

• energy savings due to less consumption
• soft starts, no mechanical and electrical shocks
• no risk of damage to the motor, the sinus filter prevents voltage distortion
• easy to install, no need to replace the motor or the pump
• if and when the pump is going to be changed, it is also possible to change to a low voltage motor 
• only a short interrupt time as the system can be pre-installed before changing the supply
• the transformers can be installed away from the frequency converters 
• uses well proven low voltage technology
• Vacon 24-hour service network guarantees uninterrupted operation

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