Open-phase protectection of A three-phase asynchronous motor

Since the phenomena of a motor turnt out due to open-phase running holds a large proportion of the running faults of a three-phase asynchronous motor,it should attached importance to by electricians.paper analyzes the electrical parameter while open phase running and suggested that an open-phase protective thermorelay should be adopted to give the motor overload protection.This suggestion may be reference for electrician.