闫涛

摘 要：空冷器主要应用在电站和石化行业，近些年空冷器在核电方面也有所突破，国内有的空冷制造商甚至取得了核电认证。电站空冷器分为直接空冷和间接空冷，直接空冷采风机来进行通风换热，风机大多采用变频风机，即风机电机用变频器控制，变频控制可以随时调整风机转速，以达到控制背压或者介质温度的目的，这样既控制灵活，又节约能源，所以空冷上变频器的选择和变频器至风机电机电缆的选择则尤为重要了。下面就空冷变频器及电缆选型及应用做以浅显的分析和研究，为空冷电气部分变频及优化提供一些建议。

关键词：变频器；变频电缆；谐波

中图分类号：TN773 文献标志码：A 文章编号：2095-2945（2018）11-0161-02

Abstract： Air cooler is mainly used in power plant and petrochemical industry. In recent years， air cooler has also made a breakthrough in nuclear power， and some domestic air-cooled manufacturers have even obtained nuclear power certification. The air cooler of power station is divided into direct air cooling and indirect air cooling. The direct air cooling fan is used for ventilation and heat exchange. The fan mostly adopts frequency conversion fan， that is， the fan motor is controlled by frequency converter， and the frequency conversion control can adjust the fan speed at any time. In order to achieve the purpose of controlling back pressure or medium temperature， it is not only flexible to control， but also save energy， so the choice of air-cooled upconverter and the cable from converter to fan motor is particularly important. The following air cooled inverter and cable selection and application to do a simple analysis and research for air-cooled electrical part frequency conversion and optimization to provide some suggestions.

Keywords： frequency converter； frequency conversion cable； harmonic

电站空冷和煤化工行业中的空冷器，主要采用变频控制，当然也有部分国外项目因为其它因素综合考虑后采用单速电机或者双速电机控制。但就节能效果来说，变频控制显得更为优秀。在空冷器运行过程中，变频控制可以同时调节空冷风机电机转速，以达到控制排汽压力或者出口介质温度的目的。相对于单速电机和双速电机，更能够精确控制换热器的换热能力，如果采用单速电机或者双速电机，无论是对换热稳定性还是对电厂电网都可能存在着一定的影响。

1 空冷器用变频装置

在空冷器上应用的变频装置输出侧通常含有较多的谐波，这些谐波有1、3、5次谐波和非正弦波，输入侧进入的是一个非线性整流电路，对风机电机和全厂电网均有着一定程度的影响。……