Protection System Design of Induction Motor for Industries

Table 1

Motor failure percentage [13].

IEEE study		EPRI study		Average %
Study name	%	Study name	%
Electrical related	30.6	Electrical related	36	33
Mechanical related	30.7	Mechanical related	32	31
Abnormal frequency	0.6	Bearing seals	6	Maintenance, environmental and other related failure reasons
Abnormal voltage	1.5	Frame	3
High ambient temp.	3	Wedges	1
Abnormal moisture	5.8	Oil leakage	1
Poor ventilation	3.9	Other components	21
Abrasive chemicals	4.2
Other reasons	19.7
Total	38.7	Total	32	36