HOMEWORK 8 This electric motor was operating just fine, then one day it mysterio

Question

HOMEWORK 8 This electric motor was operating just fine, then one day it mysteriously shut down. The electrician discovered two blown fuses, which he then replaced: On/off switch From 3-phase power source · motor When the on/off switch was closed again, the motor made a loud "humming" noise, then became quiet after a few seconds. It never turned, though. Upon inspection, the electrician discovered the same two fuses had blown again. If you were asked to help troubleshoot this electric motor circuit, what would you recommend as the next step? Subject: princble of machine and power

Explanation / Answer

Fuses are continuously blown meand there will be high current flowing through the motor. Hence first check the terminals(outside) of the motor properly connected or not, i,e check armature and field terminals first.

If the terminals are good then use multimeter to measure the resistace of winding in between terminals. if the resistance is very low and also measure the current if possible again by inserting fuses. if current is high and resistance is low at terminals then it means there is a short circuit in the winding. . and also check the initial load on the motor , if the load is high the fuse will blown

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