To improve the safety and reliability of converter in metallurgy crane,this article introduces the require-ments of clearance and creepage according to UL840,analyzes the application conditions and attention options, shows the way of getting accurate parameters,finally verifies the high-voltage withstand ability and gives out the method about how to solve actual problems in design.%为提高用于冶金起重机上的变频器的安全性及可靠性,合理设计变频器的安全间距,通过解读 UL840中对于电气间隙及爬电距离的相关要求,分析并说明了其应用条件及注意事项,给出了设计时得到正确参数值的方法,最后通过实验验证了所设计的满足文中安全间距要求的变频器具有安全可靠的绝缘耐压特性,并结合实际中可能遇到的问题给出了相应的设计思路。
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