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PdMA Tip of the Week: Why Wye

This week’s PdMA tip: Why Wye?

Why Wye

Sometimes your six lead motors are configured to start in a Wye configuration and switch to a Delta configuration during the start-up known commonly as Wye Start/Delta Run.

This starting method minimizes current demand during starting and reduces the impact on the power system, therefore, lessen the chance of the motor tripping off-line in a distressed power system.

As motor analysts and technicians, we need to remember that when de-energized the three phases are completely disconnected from each other. Connecting your MCE® test leads to motor leads 1,2,3 will indicate an open Phase with no conductivity. The recommended approach is to move your test leads to each phase and check that phase separately.

Referring to the handy EASA Electrical Engineering Handbook, we can determine which motor leads make up the three independent phases:

  • Motor lead 1 and 4 (phase 1)
  • Motor lead 2 and 5 (phase 2)
  • Motor lead 3 and 6 (phase 3)

Also, remember that each phase can have its independent resistance and capacitance-to-ground reading as a result of being disconnected from the other phases.


PdMA® Corporation is an industry leader in the field of predictive maintenance (PdM) and condition monitoring, globally offering Electric Motor Testing instruments.

You are invited to submit an Electric Motor Testing Tip of your own and receive a free PdMA® mug or hat if we publish it! Contact Lou at 813-621-6463 ext. 126 or [email protected]

Copyright 2016 PdMA® Corporation. All rights reserved. The PdMA Tip of the Week is produced by PdMA. PdMA shall not be liable for any errors or delays in the content, or any actions taken in reliance thereon. L&S Electric is reproducing with permission.

The post PdMA Tip of the Week: Why Wye appeared first on L&S Electric.



This post first appeared on Watts NewL&S Electric | The Official Blog For L&S, please read the originial post: here

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PdMA Tip of the Week: Why Wye

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