Effects of Unbalance Voltage on Induction Motors

Induction MotorUnbalance phase voltages on a three (3) power system produce negative sequence components of the voltage. Even a small voltage unbalance will result in large current unbalance during the running of motor by a factor of 6 to 10 times.

The effects of unbalance voltages are:

  • Negative phase sequence components causes motor overheating;
  • Negative phase sequence currents reduce motor output torque;
  • Motor runs at higher slip increasing rotor loss and reducing efficiency.

This is one of the reasons why in a three(3) phase distribution design, single phase loads should be distributed evenly on each phase. Unbalance single load distribution creates unbalance phase currents. The unbalance currents produce unequal voltage drop on each phase conductors leading to unbalance voltages on the load terminals.

Electrical engineers should always consider balancing single phase loads evenly across all phase when doing load distribution as voltage unbalance effects considerably the efficiency of induction motors which will affect the overall efficiency of the power system.

About the Author

Ver Pangonilo
A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia and Professional Electrical Engineer (PEE) - Philippines with extensive experience in concept select, front-end engineering, HV & LV detail design, construction and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and waste water pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).

4 Trackbacks & Pingbacks

  1. A Low Carbon Best Practice Exchange Interview: Seggy Segaran, MD, Crucible Technolgies
  2. DEWALT DW744X 10-Inch Job Site Table Saw with 24-1/2-Inch Max Rip Capacity - The ToolShed
  3. The budget for hormone stature of hair is it? | Uncategorized | Welcome to the healthy hair beauty supply blog!
  4. The budget for hormone stature of hair is it? | Uncategorized | Welcome to the healthy hair beauty supply blog!

Comments are closed.

WP Facebook Auto Publish Powered By : XYZScripts.com