Vsi circuit breaker energy storage motor capacity

What are medium voltage VSI drives?

Simplified Block Diagram of LCI and VSI Drives Medium voltage VSI drives have progressed significantly in the past 15 years, and are now the standard practice in such demanding applications as main drives in metal processing, which require high overload with very high performance up to about 20 MW.

Do VSI drives increase power efficiency?

At the same time the usage of VSI (Voltage Source Inverter) drives for increased power efficiency has also occurred. The employment of these drives has primarily taken place at the lower end of the horsepower spectrum, leaving many higher horsepower 3 phase motors still operating directly off the 3 phase distribution system.

What is voltage source inverter (VSI)?

Abstract. Converting electrical energy from direct current to alternate current, or vice versa, is one of the most frequently performed tasks in today's electrical systems. The Voltage Source Inverter (VSI) is the most widely used topology to accomplish this task.

Do VSI drives have an output filter?

The only limitation in cable length between the drive and motor is the voltage drop in the cables. An output filter has not been used in the past for any VSI drives. The motors for VSI drives are custom built with appropriate motor insulation systems. This usually means a higher voltage insulation system than for a standard utility-fed motor.

How do VSI drives work?

The motors for VSI drives are custom built with appropriate motor insulation systems. This usually means a higher voltage insulation system than for a standard utility-fed motor. The input transformer is separate from the LCI drive, so there are no limits on the input transformer primary voltage.

What is a high power VSI drive?

Recent semiconductor and VSI developments have produced high power VSI drives, with a single channel power level up to 30 MVA, as shown in Figure 2. Multiple parallel channels can be employed as described in the table. Figure 2. LCIs have been used for many years for their high power and variable speed. A typical large LCI is shown in Figure 3.