Frequency converters for a synchronous electric drive with heavy starting duty

As a result of research into the starting process of powerful cement mills at a number of cement industry plants, it was found that the starting current has an extremely negative influence on the motor life (due to heavy duty operating modes) and on the mill drive wear. ZAO TechnoStyle (Russia) suggested installing a smooth start-up the device (VPChS-2000), which can be used for starting up both one mill and a group of mills. The mill motors are of the 6, 10 kV voltage class and are based on high-voltage smooth start-up devices of and frequency converters.
In the middle of 2007, the first similar system of smooth start-up (VPChS-2000 for start-up of seven mills) was delivered to and commissioned at OAO Ulyanovsk-Cement. In May 2008 this devices was installed at ZAO Pikaliovsky Cement for alternate shock-free start-up of six synchronous motors SDM 20-49-60 of ball mill drives. Today these systems are still successfully operating.

Author: Yu.M. Sennov, G.M. Minaev, A.V. Tarasov, V.A. Kulabukhov

Section: Equipment and technology

Keywords: synchronous motor, conversion transducer