dive deeper into the transmission world
TRANSCRIPT
Transmission structures are generally broken down
into three types; Tangent, Angle and Dead-End.
Tangent
• More
economical due to
lighter loads
• Generally no
longitudinal loads
on the structure
Angle
•Used when
transmission route
changes direction
•Used from anywhere
less than a 5 degree
angle to a 90 degree
angle
•Experience greater
transverse loads
caused by the
transverse component
of the wire tension
Dead-End
• As name applies, dead-
ends are designed to
take the full component
of every wires’ tension
•Does not necessarily
mean end of
transmission line
There are different configurations whether tangent,
angle or dead-end structures are used, and may
have phases in:
•Horizontal configurations- provides the lowest
profile
•Vertical configurations- requires the minimum
width right-of-way
•Delta configurations- can reduce electrical line
losses by using horizontal and vertical distances to
maintain phase clearances
Self-supporting structures do not
use guys. They are not tied to the
ground or any other structure in a
way that offers additional support.
They are better for restrictions to
right-of-ways and tend to have
loads small enough to not warrant
guys.
Guying of structures is used to support the structure to allow for a
more economical design in both the steel structure and the
foundation. Guying of a structure will reduce bending and
deflection. The downside of guying, is that it requires more
right-of-way.
Guyed
Considerations for guyed
structures:
•Line voltage
•Electric air gap clearance
requirements
•Ground clearance requirements
•Insulation requirements
•Structural loading
•Right-of-way requirements
•Aesthetic design criteria
•Number of circuits to be
supported
•Electric & magnetic field limits Two Single-Circuit Guyed
Angle Structures
•Either base-plated with
anchor bolts or directly
embedded
•Easy installation
•Can be used as tangent,
angle pole or dead-end
structure
•Can be used for small
right-of-ways
Tangent, mono pole with arms, delta
configuration, non-guyed structure
Self-Supporting Mono Pole
•Made up of at least two
poles
•Connected with one or
more crossarms
•Sometimes guyed when
used as an angle structure
to lessen uplift, bending,
deflection
•Sometimes guyed
longitudinally when used
as dead-end structures
•Use more space in right-
of-way Tangent H-Frame, Weathering Steel
H-Frame
•Made up of three poles
•Each pole carries one
phase
•Used for large divergent
angles or as dead-ends
•Requires more right-of-
way space
•Can be self-supporting,
but are usually guyed to
lessen bending and
deflection
Double-Circuit, 3-Pole
Angle Structure
3-Pole Structure
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