At 2010-09-07 10:27, Nathan Edgars II wrote:
On Tue, Sep 7, 2010 at 9:10 AM, Alan Mintz <alan_mintz+...@earthlink.net>
wrote:
> tower_type=a_frame :
> http://sites.google.com/site/am909geo/osm-1/power_a_frame.jpg Usually seen
> as the input and output interfaces of a substation. The example shows
two of
> them at right angles to each other. They are made of two identical A-shaped
> structures with a single pole across the apex of them, similar to a
> sawhorse. The insulators are spaced evenly across that pole between the
> A-shaped sides. Additional structures are added sideways to accommodate
more
> circuits.
http://wiki.openstreetmap.org/wiki/Power_lines_in_OSM#inside_power_stations
appears to call these switches. I've been tagging each node where a
line ends in a substation as power=transformer, since I don't map the
individual parts of a substation, and the transformer is the most
important part.
The particular structures I showed are not switches. They simply support
the insulators that support the incoming/outgoing cables and spread them
from the vertical orientation in which they are carried on multi-circuit
towers to the horizontal orientation used in the substation. Some
open-frame switches/fuses may be somewhat similar in appearance, though
they are generally closer to the ground and more complex-looking. The
A-frames that I describe are easy to spot at the external interfaces to the
substation.
--
Alan Mintz <alan_mintz+...@earthlink.net>
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