What is a medium voltage drive?
Medium voltage drives (also called VFDs or variable frequency drive) are adjustable speed drives used to control the torque and speed of AC motors. The use of VFDs in industrial powertrains is increasing, in part due to a reduction in their cost and size.
Why CHB is popular topology for medium voltage drives?
CHB advantages The output voltage can be increased by adding more cells and transformer windings through the modular approach. Very low input harmonics as the transformer secondary windings can be phase shifted. Motor current harmonics are very low and the dv/dt applied to the motor windings is reduced.
What are medium voltage drives used for?
ABB supplies medium voltage variable speed drives for a wide range of applications in the cement, mining and minerals; power; water; metals; marine and chemical, oil and gas industries. They are used to adapt the motor speed to the actual need, thus optimizing energy consumption and reducing CO2 emissions.
What voltage is medium voltage?
600-100,000V
Medium Voltage (MV) is typically defined as the range of 600-100,000V. In standard voltages, this includes 4160V systems up to 69kV systems even though most equipment ratings stop at 38kV.
Where is medium voltage used?
Medium-voltage cables are commonly used in mobile substation equipment, for distribution of power in industrial settings and in mining to supply power to drills, shovels, haulers, etc., said David Sedivy, Senior Product Manager at TPC Wire & Cable Corp.
What is LV drive?
Although they operate at a lower voltage, LV drives are often used with medium voltage motors—especially motors rated at 2300 or 4160 V. In order to use an LV drive with a medium voltage motor, a step-up transformer is added to the drive. Low voltage drives offer a solution for both low- and high-power applications.
What is MV and HV?
This document divides voltages into five classifications. These classifications can be combined into the categories below: High (HV), Extra- High (EHV) & Ultra-High Voltages (UHV) – 115,000 to 1,100,000 VAC. Medium Voltage (MV) – 2,400 to 69,000 VAC. Low Voltage (LV) – 240 to 600 VAC.
What voltage is considered HV?
Electricity is classified as high voltage (HV) if it exceeds 1,000 Volt AC or 1,500 Volt DC. Equipment and conductors that carry high voltage have specific safety requirements and procedures.
What is the range of medium voltage?
1000 V to 35 kV
Keeping the limits in check The limits are clearly defined, however, in the IEC 60038 standard: low voltage is up to 1000 V, medium voltage is from 1000 V to 35 kV, and high voltage is over 35 kV.
What is medium voltage vs high voltage?
There can be different ideas about what qualifies as a low, medium or high voltage motor. “Some people consider anything above 1000 V as high voltage. The limits are clearly defined, however, in the IEC 60038 standard: low voltage is up to 1000 V, medium voltage is from 1000 V to 35 kV, and high voltage is over 35 kV.