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Motor protection and control tips, procedures

  • May 2005
  • Number of views: 9804
  • Article rating: No rating

Richard Hughes (deceased)
Pump & Motor Works, Inc.

This series of four articles covers many schemes of motor protection and control.

Topics covered include:

  • Time delay fuses
    • Fuse selection
    • Over-current protection
    • Avoiding fuse overloads
  • Circuit breakers
    • Inputs to electronic protection relays
    • Feeding, protecting a motor starter
    • Common features
  • Motor starters
    • How motor starters operate
    • Light, medium or heavy duty
    • Momentary start button
    • Wye series start, parralel run
    • Variety of controls
  • IEEE and ANSI power system device numbers
  • Dashpot type overload relay
  • Thermal overload relay
  • Current transformer
  • Compact relays
  • Restoring balanced voltage
  • Transient voltages
  • Surge capacitor, surge arrestor

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EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • 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

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Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

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  • How to read a motor nameplate
  • Motor storage recommendations

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EASA/AEMT Rewind Study

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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.

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ANSI/EASA AR100-2020

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Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

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EASA Technical Manual

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Revised May 2024
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.

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