挖沙船的变频节能改造分析

挖沙船上主电机在采用变频调速以前，多用星三角起动或自耦减压起动方式。这种启动方式起动电流较大，导致所选用的柴油发电机的容量过大。采用变频调速以后，可以减小电动机的起动电流，降低柴油发电机的容量，减少前期投资，给企业带来可观的经济效益。

Analysis of Frequency Conversion for Energy Saving of Dredging Ship

Before using Variable frequency adjustable speed, dredging ships main motor mostly use the star delta starter or autotransformer starting mode. This startup mode will produce large starting current, as a consequence a large capacity diesel generator must be chosen. The use of Variable frequency adjustable speed can reduce the starting current of the motor,the capacity of diesel generators, and upfront investment, which can bring considerable economic benefits to the enterprise.