Apprentice Lineman Transformer Theory Questions and Answers
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Apprentice Lineman Transformer Theory
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Apprentice Lineman Transformer Theory
Apprentice Lineman Transformer Theory
Why is a Closed Wye - Closed Delta primary neutral floated? - Answer- To prevent the backfeed of full primary voltage if a line cutout is blown.
Why is a 4th cutout installed on the primary neutral of a closed Wye -closed Delta Bank? - Answer- To prevent ...
what must be done before climbing above a transfor
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Apprentice Lineman Transformer Theory
Apprentice Lineman Transformer Theory
Apprentice Lineman Transformer Theory
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Apprentice Lineman Transformer
Theory
Why is a Closed Wye - Closed Delta primary neutral floated? - Answer- To prevent
the backfeed of full primary voltage if a line cutout is blown.
Why is a 4th cutout installed on the primary neutral of a closed Wye -closed Delta
Bank? - Answer- To prevent Ferroresonance while switching.
On an open transformer bank, what KVA capacity is the bank rated for? - Answer-
86.6% of nameplate ratings.
Expain the term "Backfeed" - Answer- Feeding the primary coil through the
secondary coil.
What must be done before climbing above a transformer? - Answer- Make sure the
tank ground is intact, de-energize the high side and remove secondary leads.
What determines the amount of voltage drop when a transformer is fully loaded? -
Answer- Impedance
Explain polarity of a transformer. - Answer- Relative direction of current flow primary
to secondary.
When paralleling or banking transformers, the impedance must be within _____% of
each other? - Answer- 10%
What KVA capacity would you have if you convert a closed delta bank to an open
delta bank? - Answer- 57.7% of the original 3 transformers. OR 86.6 of the remaining
2.
How much capacity would you gain from using a closed delta bank instead of an
open delta bank? - Answer- (57.7 to 100%) = 42.3%
What do you need to do with the neutral connection on a closed wye -closed wye
transformer bank? - Answer- Tie the primary neutral.
What purpose does the case ground serve on a transformer? - Answer- To make
sure the transformer case doesn't become energized, and on a single bushing
transformer the case ground is the H2 connection.
Name the types of transformer banks you can make with two or three transformers. -
Answer- Wye-Wye, Wye-Delta, Delta-Delta, Delta-Wye, Open Wye-Delta, Open
Delta-Delta
What does CSP mean? - Answer- Completely self protected
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