Transcription of Motor Protection - Electrical Sector
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Motor Protection - Electrical Sector
133 2005 Cooper BussmannFor Summary of Suggestions to Protect Three-Phase Motors AgainstSingle-Phasing see the end of this section, page , the causes of Motor failure can be attributed to:Overloads30%Contaminants19%Single-pha sing14%Bearing failure13%Old age10%Rotor failure5%Miscellaneous9%100%From the above data, it can be seen that 44% of Motor failure problems arerelated to a Motor to reach and operate at a temperature 10 C above its maximum temperature rating will reduce the Motor s expected life by 50%.Operating at 10 C above this, the Motor s life will be reduced again by 50%.
©2005 Cooper Bussmann 133 For Summary of Suggestions to Protect Three-Phase Motors Against Single-Phasing see the end of this section, page 137. Historically, the causes of motor …
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