Distribution Dead End Stub
Distribution Dead End Stub
(OP)
I have run across a dead end distribution line, with an extension running about 200 feet further from the last transformers. Supposedly, this is for lightning surges; the reflection at the end of the line subtracts at the transformers.
Has anyone else seen this? Does it really work?
Has anyone else seen this? Does it really work?






RE: Distribution Dead End Stub
IMHO, the extension is a waste of money. It does allow you to put the transformer on a tangent pole where there is more space. It might be worth it if you needed the extra span anyway for secondary.
RE: Distribution Dead End Stub
But, maybe I am missing something. Maybe an arrestor at the end where the reflection doubles up means less surge at the transformers (and they would still have their own arrestors).
RE: Distribution Dead End Stub
When there is an arrester that is conducting surge current, there is a negative reflection. The voltage at the arrester is minimum (equal to the arrester I²R discharge voltage), but the negative reflection reduces the voltage at other points on the line as it propogates down the line.
RE: Distribution Dead End Stub
It's not a new trick; just something messed up!
Thanks for the reality check.