Discussion
Match the connection with its property.
1. Delta-star 2. Delta-delta 3. Star-star without tertiary
P. No phase shift and can run open delta Q. Thirty degree phase shift R. Liable to harmonic voltage distortion
Answer: A
Correct answer: 1-Q, 2-P, 3-R
Each connection has its characteristic property. Delta-star introduces the 30 degree phase shift between line voltages, which is why vector groups must match when transformers are paralleled. Delta-delta gives no shift and can continue in open delta on two units if one fails. Star-star without a tertiary has no path for triple harmonic currents, so its phase voltages are distorted.
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