Stockbridge damperS

oVerHead LiNeS

product cataLogue

For effective control of conductor vibrations

VibratioN c

oN

tro

L

exceLLeNce

Features

PFISTERER SEFAG vibration dampers are designed to:

control aeolian vibration in each span of the line within �the internationally accepted limits with the minimum number of units;

maintain damping capacity over the entire range of �ambient temperatures and for the whole expected life of the line;

be free from corona at the maximum voltage of the line �when installed on the phase conductors;

be installed and removed on energized lines; �

be maintenance-free for the whole expected life of the line; �

VibratioN damperS

general

Fatigue failures of overhead conductor strands due to wind-induced vibrations were observed since the beginning of the last century.

The most effective protection device was invented by George Stockbridge in 1924 in the form of an inertial energy absorber equipped with a stranded steel cable holding two weights. Since then, the Stockbridge’s vibration damper underwent several design and manufacturing changes that increased its performance and endurance.

Despite many other damping devices have been invented during the last century, the Stockbridge type vibration damper is still the best technical and economical solution for the control, within safety limits, of the overhead cable vibrations.

iN aeoLiaN VibratioN dampiNg

2

maintain a suitable grip on the cable resisting the loos- �ening effect of vibrations;

guarantee that individual components are secured against �becoming loose in service.

key data

PFISTERER SEFAG has been one of the manufacturers who actively contributed, during the last 50 years, to the enhancement of the stockbridge damper.

Today, PFISTERER SEFAG can supply powerful units with excellent performance, suitable for any type of overhead cable, including new conductors such as OPGW, ADSS, GTACSR, ACCR, etc.

PFISTERER SEFAG vibration dampers can be equipped either with bolted clamp or with helical rod attachment.

PFISTERER SEFAG vibration dampers are installed all over the world and well proven in the most severe environmental conditions.

Stockbridge dampers in service

VibratioN damperS

3

comprehensive client assistance

Facilities and services

PFISTERER SEFAG can provide a full package including:

vibration damping study and design of the most appropriate �damping system for any specific project, at offer stage;

evidence of comprehensive type testing and intensive �quality control during production;

supply of vibration damper units manufactured in �accordance with the most modern technology;

supply of clear installation instructions and availability �for any further client’s requirement;

capacity to perform field vibration measurements using �vibration recorders designed and manufactured by PFISTERER SEFAG.

Vibration test laboratory

Field testsQuality control

Production

CounterWeight: TYPE2

L1 [ mm ] :

17

L2 [ mm ] :

18

L3 [ mm ] :

130

L4 [ mm ] :

130

R1 [ mm ] :

25

R2 [ mm ] :

16

R3 [ mm ] :

16

S [ mm ] :

13

Density [ kg/dm^3 ] :6.7

Mass [ kg ] :

1.624

Flex. Inertia [ kg * m^2 ] :4.791129E-03

X distance to C.O.G. [ mm ] :35.4

Tors. Inertia [ kg * m^2 ] : 8.121876E-04

Y distance to C.O.G. [ mm ] :0

TECNOSOFT III Pfisterer

Date: 05/10/2008

licence :U.Cosmai

TYPE2

TECNOSOFT III © Pfisterer Date: 05/10/2008

Damper G

Damper Response : Damper G

Freq Force Phase Freq Force Phase Freq Force Phase Freq Force Phase Freq Force PhaseHz daN/m Deg Hz daN/m Deg Hz daN/m Deg Hz daN/m Deg Hz daN/m Deg

1 0.00 0.0 26 2580.56 59.2 51 6448.85 50.4 76 6889.41 72.8 101 12300.98 26.6 2 0.00 0.0 27 2798.24 53.5 52 6908.95 47.6 77 6857.27 70.0 102 12624.42 25.8 3 0.00 0.0 28 3332.67 48.2 53 7631.24 46.3 78 6845.15 67.0 103 12953.05 25.1 4 0.00 0.0 29 4225.33 46.0 54 8737.50 45.1 79 6874.09 64.0 104 13286.77 24.5 5 234.95 1.5 30 4873.72 46.6 55 10225.29 47.1 80 6914.97 61.0 105 13625.48 23.8 6 360.72 1.0 31 5531.45 48.9 56 11751.69 56.3 81 6992.20 58.0 106 13969.12 23.2 7 517.24 1.0 32 6113.17 53.4 57 12519.73 67.6 82 7120.00 55.1 107 14317.61 22.6 8 711.32 1.0 33 6442.97 60.1 58 12687.30 77.5 83 7263.31 52.3 108 14670.86 22.0 9 952.58 1.1 34 6609.25 67.6 59 12569.82 84.1 84 7437.64 49.7 109 15028.83 21.4 10 1247.09 2.1 35 6591.59 74.1 60 12395.70 87.7 85 7639.78 47.1 110 15391.45 20.9 11 1666.31 4.7 36 6491.86 78.8 61 11939.70 89.6 86 7897.48 44.7 111 15758.66 20.4 12 2036.22 44.2 37 6310.46 84.8 62 11079.78 90.9 87 8193.70 42.6 112 16130.40 19.9 13 1879.25 55.0 38 6075.61 88.8 63 10576.42 91.8 88 8498.34 40.7 113 16506.63 19.4 14 1766.47 56.7 39 5772.64 90.5 64 9955.31 92.5 89 8814.90 38.9 114 16887.30 19.0 15 1708.92 52.5 40 5536.57 89.4 65 9364.60 92.8 90 9118.72 37.1 115 17272.36 18.6 16 1770.56 46.0 41 5295.87 85.9 66 8969.71 92.6 91 9376.91 36.0 116 17661.77 18.1 17 2165.21 44.8 42 5156.91 81.9 67 8606.14 91.7 92 9641.83 34.8 117 18055.49 17.7 18 3438.18 68.9 43 5066.85 78.3 68 8302.42 90.5 93 9913.29 33.7 118 18453.49 17.3 19 3327.69 81.8 44 5033.25 74.5 69 8006.40 89.1 94 10191.10 32.7 119 18855.73 17.0 20 3037.11 87.1 45 5148.94 69.8 70 7769.07 87.3 95 10475.10 31.7 120 19262.18 16.6 21 2786.71 87.9 46 5385.04 67.7 71 7554.80 85.3 96 10765.14 30.7 121 0.00 0.0 22 2549.34 87.4 47 5531.37 62.5 72 7363.15 83.1 97 11061.06 29.9 122 0.00 0.0 23 2346.13 82.7 48 5701.31 60.2 73 7207.37 80.7 98 11362.73 28.9 123 0.00 0.0 24 2293.89 74.1 49 6080.02 56.1 74 7075.87 78.4 99 11670.02 28.2 124 0.00 0.0 25 2420.59 64.9 50 6244.74 53.3 75 6962.36 75.6 100 11982.80 27.3 125 0.00 18.6

TECNOSOFT III ©Pfisterer

Date: 05/10/2008licence :U.Cosmai

Run File : GSW10Type : Single No Dampers

Run date : 05/10/2008

Res File : None

Fat File : NoneConductor : GSW10

Diameter (mm) : 10Tensile load (kN) : 10.24

Unit mass (kg) : 0.483Stiffness (N*m^2) : 72.97

Damping (Joules) : 21498.51

Exp wavelength : 4.35Exp amplitude : 2.35

11 Armor rods

Length (m) : 1.2

Diameter (mm) : 3

Wind file: SINGLE

Turbulence : 7 %

Function : Variable-2

No Dampers

Note:If color print, then black = maximum strain at clamps, red = maximum damper amplitude,

blue = antinode amplitude, green = maximum strain at damper clamp.

All plotted or printed values are 0-peak.

VibratioN c

oN

tro

L

pFiSterer SeFag ag Phone +41 (0) 41 4997 272 Fax +41 (0) 41 4972 269E-mail connect@sefag.ch

Werkstrasse 76102 Malters, Luzern Switzerland

www.pfisterer.com

01/2

009

/ Ver

sion

01E

n

I ©

PFI

STE

RE

R S

EFA

G A

G, 2

009

I

Sub

ject

to te

chni

cal m

odifi

catio

ns

I

Con

cept

& R

ealis

atio

n: w

ww

.sta

rmed

ien.

ch

4

VibratioN damperS

order information

Type Clamp range "A" Part number

ST 715

for conductor Ø 7 – 15 mm

Ø 7 – 15 182 025-101

Ø 15 – 23 182 025-211

Ø 23 – 31 182 025-311

ST 1523

for conductor Ø 15 – 23 mm

Ø 15 – 23 182 025-201

Ø 23 – 31 182 025-321

Ø 31 – 39 182 025-421

ST 2331

for conductor Ø 23 – 31 mm

Ø 23 – 31 182 025-301

Ø 31 – 39 182 025-431

Ø 39 – 47 182 025-531

ST 3139

for conductor Ø 31 – 39 mm

Ø 31 – 39 182 025-401

Ø 39 – 47 182 025-541

ST 3947for conductor Ø 39 – 47 mm

Ø 39 – 47 182 025-501

Type Clamp range "A" Part number Clamp range "A" Part number

STO 715

aluminium clad steel rods for conductor Ø 7.06 – 14.37 mm

galvanized steel rods for conductor Ø 6.96 – 14.01 mm

Ø 7.06 – 7.51 182 025-700 Ø 6.96 – 7.36 182 025-800

Ø 7.52 – 7.99 182 025-701 Ø 7.37 – 7.84 182 025-801

Ø 8.00 – 8.47 182 025-702 Ø 7.85 – 8.30 182 025-802

Ø 8.48 – 8.96 182 025-703 Ø 8.31 – 8.80 182 025-803

Ø 8.97 – 9.46 182 025-704 Ø 8.81 – 9.49 182 025-804

Ø 9.47 – 9.97 182 025-705 Ø 9.50 – 9.90 182 025-805

Ø 9.98 – 10.38 182 025-706 Ø 9.91 – 10.51 182 025-806

Ø 10.39 – 10.81 182 025-707 Ø 10.52 – 11.09 182 025-807

Ø 10.82 – 11.45 182 025-708 Ø 11.10 – 11.78 182 025-808

Ø 11.46 – 12.11 182 025-709 Ø 11.79 – 12.46 182 025-809

Ø 12.12 – 12.82 182 025-710 Ø 12.47 – 13.25 182 025-810

Ø 12.83 – 13.58 182 025-711 Ø 13.26 – 14.01 182 025-811

Ø 13.59 – 14.37 182 025-712

STO 1520

for conductor Ø 14.38 – 20.28 mm for conductor Ø 14.02 – 20.12 mm

Ø 14.38 – 15.05 182 025-713 Ø 14.02 – 14.87 182 025-812

Ø 15.06 – 15.89 182 025-714 Ø 14.88 – 15.76 182 025-813

Ø 15.90 – 16.93 182 025-715 Ø 15.77 – 16.53 182 025-814

Ø 16.94 – 17.82 182 025-716 Ø 16.54 – 17.87 182 025-815

Ø 17.83 – 18.68 182 025-717 Ø 17.88 – 18.99 182 025-816

Ø 18.69 – 19.50 182 025-718 Ø 19.00 – 20.12 182 025-817

Ø 19.51 – 20.28 182 025-719

STO 2027

for conductor Ø 20.29 – 26.81 mm

Ø 20.29 – 21.38 182 025-720

Ø 21.39 – 22.62 182 025-721

Ø 22.63 – 23.89 182 025-722

Ø 23.90 – 25.29 182 025-723

Ø 25.30 – 26.81 182 025-724

STO 2734

for conductor Ø 26.82 – 33.90 mm

Ø 26.82 – 28.46 182 025-725

Ø 28.47 – 30.14 182 025-726

Ø 30.15 – 31.97 182 025-727

Ø 31.98 – 33.90 182 025-728

materialsHelical rods: aluminium clad steel or galvanized steel �Clamp: aluminium alloy �Counterweights: galvanized steel �Messenger cable: galvanized steel �

orders with clamp options:

Orders for clamp options must be indicated with the com- ponent code of the desired option at the end of the part no.

options

Component codes:

B Shear head capS Stainless steel boltBS Shear head cap and stainless steel bolt

materialsClamp: aluminium alloy �Bolt, nut, plain washer: galvanized steel �Safety plate: stainless steel �Counterweights: galvanized steel �Messenger cable: galvanized steel �

A A

Helical rod attachment bolted clamp