The Protection Method against the Operation under Unbalance Voltage in 3-phase Squirrel-Cage Induction Motor

3상절형유도전동기의 불평형운전에 대한 보호 방안

A new method of protecting 3-phase squirrel-cage induction motor aginst burning-out by unbalance operation is proposed. This paper studied various kinds of situations occurred by unbalance operating in 3-phase induction motor, and we provided the search coils in the slots of stator and rotor for the purpose of detecting electrical phenpmena during unbalance operation. Through experiments, we find that search coils in the slots of stator is effective method for protecting the induction motor from unbalance operating.