Apprentice Lineman Transformer Theory Questions and Answers
8 views 0 purchase
Course
Apprentice Lineman Transformer Theory
Institution
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
Written for
Apprentice Lineman Transformer Theory
Apprentice Lineman Transformer Theory
Apprentice Lineman Transformer Theory
All documents for this subject (2)
Seller
Follow
Gurustudy
Reviews received
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Gurustudy. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.00. You're not tied to anything after your purchase.
