Mon Oct 9, 2017 Announcements • Matlab to be incorporated ... · PDF fileWind-induced...
Transcript of Mon Oct 9, 2017 Announcements • Matlab to be incorporated ... · PDF fileWind-induced...
EE 5
200
- Lec
ture
16
Mon
Oct
9, 2
017
Topi
cs fo
r Tod
ay:
•A
nnou
ncem
ents
•M
atla
b to
be
inco
rpor
ated
in u
pcom
ing
Hm
wks
.•
Offi
ce h
rs: 4
:05-
5:55
pm W
,F•
Offi
ce: E
ER
C 6
14.
Pho
ne: 9
06.4
87.2
857
•R
ecom
men
ded
prob
lem
s fro
m C
h.4,
5 so
lutio
ns p
oste
d•
Nex
t: Tr
ansm
issi
on L
ine
C P
aram
eter
s, C
hapt
er 6
Cha
pter
4 -
Ser
ies
Res
ista
nce
of T
rans
mis
sion
Lin
es•
Con
duct
or d
ata
(link
s pr
ovid
ed o
n w
eb p
age)
•S
pira
ling,
effe
ctiv
e le
ngth
is a
bout
2%
long
er•
Ser
ies
Res
ista
nce,
tem
pera
ture
cor
rect
ion
Cha
pter
5 -
Ser
ies
Indu
ctan
ce o
f Tra
nsm
issi
on L
ines
•S
elf-i
nduc
tanc
e of
a c
ondu
ctor
•R
evie
w o
f mut
ual i
nduc
tanc
e co
ncep
ts•
Mut
ual i
nduc
tanc
e be
twee
n 2
cond
ucto
rs•
Indu
ctan
ce m
atrix
for g
roup
of c
ondu
ctor
s
Win
d-in
duce
d os
cilla
tion
(from
Wik
iped
ia)
Win
d ca
n ge
nera
te th
ree
maj
or m
odes
of o
scill
atio
n in
sus
pend
ed c
able
s:[4
]
•G
allo
p ha
s an
am
plitu
de m
easu
red
in m
etre
s an
d a
frequ
ency
rang
e of
0.08
to 3
Hz;
•A
eolia
n vi
brat
ion
(som
etim
es te
rmed
flut
ter)
has
an
ampl
itude
of
mill
imet
res
to c
entim
etre
s an
d a
frequ
ency
of 3
to 1
50 H
z;•
Wak
e-in
duce
d vi
brat
ion
has
an a
mpl
itude
of c
entim
etre
s an
d a
frequ
ency
of 0
.15
to 1
0 H
z
The
Sto
ckbr
idge
dam
per t
arge
ts o
scill
atio
ns d
ue to
aeo
lian
vibr
atio
n; it
is le
ssef
fect
ive
outs
ide
this
am
plitu
de a
nd fr
eque
ncy
rang
e. A
eolia
n vi
brat
ion
occu
rs in
the
verti
cal p
lane
and
is c
ause
d by
alte
rnat
ing
shed
ding
of v
ortic
eson
the
leew
ard
side
of t
he c
able
. A s
tead
y bu
t mod
erat
e w
ind
can
indu
ce a
stan
ding
wav
e pa
ttern
on
the
line
cons
istin
g of
sev
eral
wav
elen
gths
per
span
.[4] A
eolia
n vi
brat
ion
caus
es d
amag
ing
stre
ss fa
tigue
to th
e ca
ble[
5] a
ndre
pres
ents
the
prin
cipa
l cau
se o
f fai
lure
of c
ondu
ctor
stra
nds.
[4] T
he e
nds
ofa
pow
er li
ne s
pan,
whe
re it
is c
lam
ped
to th
e tra
nsm
issi
on to
wer
s, a
re a
tm
ost r
isk.
[5] T
he e
ffect
bec
omes
mor
e pr
onou
nced
with
incr
ease
d ca
ble
tens
ion,
[5] a
s its
nat
ural
sel
f-dam
ping
is re
duce
d.
Tran
smis
sion
Lin
e V
ibra
tion
Dam
pers
-
Top:
Tra
ditio
nal S
tock
brid
ge -
2 fre
quen
cies
Bot
tom
: Spi
ral t
ype
Tran
smis
sion
Lin
e V
ibra
tion
Dam
per -
Fou
r Res
onan
t Pea
ks
Spacer Dampers, Stockbridge Dampers, Recorders and Warning Spheres
Triple Spacer DamperPFISTERER’s spacer dampers are specifically designed and coordinated to providedamping against conductor motions caused by wind. In particular the spacer damperscontrol the levels of aeolian vibration and subspan oscillation within the acceptedsafety limits, under all service conditions and for the expected life time of the line.PFISTERER offers a complete range of spacer dampers for two, three, four and sixbundles, with spacing ranges from 300 to 600 mm.
Stockbridge DamperPFISTERER’s range of stockbridge dampers is designed to dissipate energy from alltypes of conductors, shieldwires and OPGW cables caused by wind-induced motions.Many tests are needed to prove a successful damper design, which includescorrosion resistance, damping performance and fatigue behaviour. These tests arenecessarily supplemented by electrical tests in regard to corona and RIV and areperformed in PFISTERER’s own laboratories.
Vibration RecorderAs the ultimate means of checking damping systems or to investigate the cause ofconductor damages, PFISTERER offers vibration recorders. These can be used toeasily measure vibrations on lines in operation. Moreover, the component of windvelocity acting perpendicularly to the line and the ambient temperature can berecorded. The conductor vibration data can be recorded and converted. Byautonomous, long-term and direct measurements, an assessment of all critical linesections can be made.
Warning SpherePFISTERER’s warning sphere has a diameter of 600 mm and is especiallymanufactured to avoid the loss of colour and UV-degradation by using a specialmaterial and painting technology. Optimisations have been applied to eliminate clamploosening and audible noise due to vibration. Installation costs can be reduced thanksto its simple installation. The sphere is available in various colours and for severalconductor diameters.
Spacer Dampers, Stockbridge Dampers, Recorders and Warning Spheres http://us.pfisterer.com/p-freileitung_feldabstandhalter.php?nav=overheadl...
1 of 1 10/8/2012 2:13 PM