Application of Voltage Step　-　down Starting of Electric Motor

Tang Ying（Engineering Company of Beijing General Research Institute of Mining & Metallurgy，

Beijing 100070，China）

 

Abstract The paper states the effect of voltage step - down starting of electric motor that is easily to be ignored in practical application based on the calculation of voltage step - down starting of squirrel - cage motor as well as the grounding fault protecting sensitivity of electric motor.

Key words　Squirrel - cage motor　Voltage step -down starting　Sensitivity of single - phase grounding protection

 

摘　要　通过对笼型电动机降压启动的计算，及对电动机接地故障保护灵敏度的计算，阐述电动机降压启动在实际运用中易被忽视的作用。

关键词　笼型电动机　降压启动　单相接地保护的灵敏度