Re: Short Protection in Yards

Vollrath, Don <dvollrath@...>
 

Allan's advice makes a lot of sense. Each operator should be isolated by mistakes of others.
Make the yard a separatly protected power district, isolated from main tracks where other operators would be working.
If the yard is double ended and worked by two operators, make each end a separate district.
Likewise, make other industrial switching areas separate districts from main tracks.
Isolating each track is overkill. If you have unknown shorts, find & fix before you attempt operating sessions.
DonV

-----Original Message-----
From: WiringForDCC@...
[mailto:WiringForDCC@...]On Behalf Of wirefordcc
Sent: Monday, January 16, 2006 8:04 PM
To: WiringForDCC@...
Subject: [WiringForDCC] Re: Short Protection in Yards


You could make the entire yard a single protected zone or you could
protect each individual turnout. In between is everything you can
imagine.

With a yard, if you get a short, you will likely know why. Chances
are you are in the middle of a movement and are staring right at the
cause of the short.

So what purpose is served by short protection? Probably the most
useful purpose is to not shut down other operators. So protecting
the whole yard as a single unit is probably enough. If you have
more than one yard operator or a double-ended yard being operated
from both ends, maybe protecting the yard as two zones is
appropriate.

Probably the second most important function served by short
protection is limiting the amount of railroad that is rendered
inoperable. Suppose you have a short and can't identify why. Or
you found the problem, but the middle of an operating sessions isn't
the time to fix it. So maybe you break your double-ended yards into
say four zones. Now if you have a short you can't fix, it only
immobilizes a portion of your yard.

You could certainly protect each individual track, but that results
in a rats nest of wiring and may not be worth it.

I hope these thoughts help.

Allan






http://www.WiringForDCC.com
Yahoo! Groups Links

Join w4dccqa@groups.io to automatically receive all group messages.