Loss of Voltage in Delta System

[Humble2000]

Quote"

In a delta system, the loss of one phase results in sensor readings with magnitudes slightly more than 1/2 of normal phase-to-phase voltage. Simultanious loss of two phases is not detectable as a phase imbalance condition.

Does this line make sense?

 

[wareagle]

With the loss of one phase you get full voltage across one transformer and half voltage across the other two.
Loss of 2 phases would give you zip. Check here for more info.

http://www.progress-energy.com/cust...ntations/MotorProtection_VoltageUnbalance.pdf