软启动器在“引增合一”改造工程中的应用

Application of soft starter in reformation project of merging of induced draft fan and boost fan into one

某电厂#6机组进行"引增合一"改造后,引风机电机直接启动时,6 kV母线电压降为额定电压的76%,不满足规程要求。采取在一次回路中加装软启动器的方案,降低引风机启动电流。引风机电机启动电压降计算和现场试验表明:软启动器的限流倍数取4.0时,6 kV母线电压降为额定电压的84%,符合规程要求。最后指出了软启动器启动过程中对系统及设备的影响以及软启动器现场使用的注意事项。

After the reformation of merging of induced draft fan and boost fan into one for the unit No. 6 of a power plant,when the motor of the induced draft fan started directly,the voltage of6kV bus lowered to 76% of the rated value,which can not meet the requirement of relevant regulations. A scheme of adding soft starter in primary circuit was adopted to lower the start current of the induced draft fan. It was shown by calculation and field test that when the limitation of over-current multiple of the soft starter is selected as 4. 0,the voltage of 6 kV bus will lowers to 84% of the rated value,which can meet the requirement of relevant regulations. At last,the influence of the soft starter in start process on the system and equipments and the matters needing attention in site use of the soft starter were pointed out.