We have Electrical motor trip without any thing No alarm and from CB is everythi

Question

We have Electrical motor trip without any thing No alarm and from CB is everything is ok Just trip and we made rest for dry fault And start the motor , now it's working smoothly without trip What could be the reason?
I want to write RCA analysis or report . How I should write ???? We have Electrical motor trip without any thing No alarm and from CB is everything is ok Just trip and we made rest for dry fault And start the motor , now it's working smoothly without trip What could be the reason?
I want to write RCA analysis or report . How I should write ???? We have Electrical motor trip without any thing No alarm and from CB is everything is ok Just trip and we made rest for dry fault And start the motor , now it's working smoothly without trip What could be the reason?
I want to write RCA analysis or report . How I should write ????

Explanation / Answer

Maintenance team came into the conclusion that over heating causes rapid deterioration of motor winding insulation and it got tripped.There are mainly five main reasons for this overheating—overload, poor power condition, high effective service factor, frequent stops and starts, and environmental reasons.

Standard CB are not designed to trip instantaneously for every loads. Breakers will be designed with a time curves they must meet, and for anything but the highest currents there is a noticeable delay from seconds to hours.

Bearing and the winding damages are the most common motor failures. The main reason will be excessive heat. Preventive maintenance practices frequently limit on-line electrical measurements to interpreting current levels. While important, this method is inconclusive in identifying failures caused by excessive winding heat.

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