13.3.2 Summary

•

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This document discusses the advantages of using a delta-connected power source. If one of the windings in a delta-connected three-phase source fails open, the line voltage remains 120V and the only effect is extra current in the remaining functioning windings, allowing fault tolerance.

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pen failures in the load elements.
e greatest advantage of the ∆-connected source is its fault toler
f the windings in a ∆-connected three-phase source to fail open
ng load voltage or current!

120 V ! 0o 120 V
+ -

+
winding 120 V 120 V 120 V
failed open! ! 120o
-

Even with a source winding failure, the line voltage is still 120 V,
120 V. The only difference is extra current in the remaining fu

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