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A closer look: Winding protection device can prevent permanent damage to motor

  • March 2002
  • Number of views: 7725
  • Article rating:

Cyndi Nyberg
Former EASA Technical Support Specialist 

There are a number of different types of wind­ing protection devices used with motors. However, they all basically do the same thing; they sense a change from the normal operating temperature and either sound an alarm or take the motor off line when the specified temperature limit has been met or exceeded. 

Temperature protection is not limited to just large motors. A smaller motor that is critical to op­eration would be a good candidate for winding temperature protection if a failure would cause significant costs due to downtime. 

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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 1: General

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines
  • Section 5: Electronics

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 11: Motor Accessories & Terminal Boxes

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 11: Motor Accessories & Terminal Boxes

Tags: Resistance Temperature Detectors (RTDs) Winding temperature Winding protection
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