This document discusses different types of dampers used in overhead transmission lines to reduce vibrations caused by wind. It describes Stockbridge, ELGRA, torsional, Haro, and various spacer dampers. Stockbridge dampers use weights to counteract vibrations and have not changed much since their development in the 1920s. ELGRA dampers from Sweden use elastomer pads and weights. Torsional dampers are designed for bundled high voltage lines. Haro dampers effectively reduced vibrations but were difficult to transport. Spacer dampers establish conductor distance and reduce amplitudes on bundled lines.

2. DAMPERS
Submitted To:
Sir, Muhammad Shafiq Ahmad
PRESENTED BY:
Rana Adeel BSET-01113066
Shafiq-ur-Rehman BSET-01113035

3. DAMPING SYSTEMS
 Due to wind, overhead transmission lines will be excited to
vibrations and oscillations that can lead to damage on the
conductor of the overhead transmission line, single parts or
the pole. In order to reduce these vibrations and oscillations
to an uncritical dimension, damping systems will have to be
installed in the overhead transmission lines.

4. VIBRATION DAMPER IN TRANSMISSION LINE
 Wind-induced vibration of overhead conductors is common
worldwide and can cause conductor fatigue Near a hardware
attachment.

5. EFFECT OF VIBRATION:
 It should be understood that the existence of vibration on a
transmission or distribution line doesn’t necessarily constitute
a problem. However, if the magnitude of the vibration is high,
damage in the form of abrasion or fatigue failures will
generally occur over a period of time.

6. FEATURES:
Clamp
weights
Wire
Bolt

7. TYPES OF DAMPERS
1. Stockbridge Damper
2. ELGRA dampers
3. Tersional dampers
4. Haro damper
5. Twin Spacer Damper
6. Triple spacer Damper
7. Quadruple Spacer Damper

8. STOCKBRIDGE DAMPER
These dampers are used to counteract vibrations excited
by
wind, Depending on the type of the the conductor of the
Overhead transmission line, several damper types with
many
Different models are available. The name of the damper is
due to the scientist H. Stockbridge, who advanced the
development of the damper in the 1920’s. The functional
mode has not changed up to now and is one of the
methods
for reducing vibrations on overhead transmission lines that
are spread most.

9. ELGRA DAMPERS
ELGRA dampers from Sweden were installed on the first
330kV lines emanating from the Snowy River. These consisted
of a number of weights resting on elastomer pads around a
central rod suspended vertically.

10. TORSIONAL DAMPERS
Torsional Damper is the most modern anti-galloping device available today
which has been specially designed for use on bundled high voltage and extra
high voltage (132kv and up to more) power transmission lines.

11. HARO DAMPER
The Haro damper, although expensive, virtually solved the
vibration problems at Saskatchewan Power. Its one
disadvantage
was that it was over a meter in length and was difficult to
transport and install.

12. SPACER DAMPERS
Spacers serve to establish a distance between the partial
conductors of a bundle line in order to prevent the conductors
from knocking together and thus avoid damage done to
conductors. Spacer dampers will be used if vibrations excited by
wind need to be expected. the vibration amplitudes of the conductor
can be reduced to an uncritical dimension. In this context, many
different models of the spacers are available for different bundle
arrangements.

13. TWIN SPACER
Twin Spacer - Dampers are
used to control vibration and
conductor oscillation, maintain
conductor spacing and restore
conductor spacing after a short
circuit occurs.
Material:
Frame, arm and keeper
Aluminium alloy
Nut and bolt

14. TRIPLE SPACER DAMPER
 Spacer dampers were originally developed to suppress bundle conductor sub
span oscillations that could cause damage to multi-conductor bundle systems.
 Spacer Dampers are designed to provide corona free performance on operating
voltages up and including 500 kV. Special designs are available for 765 kV
applications.

15. QUADRUPLE SPACER DAMPER
 Spacer-damper installed on a square four conductor
bundle to control both vibration and wake induced
oscillation.

16. REPLACEMENT AND INSTALLED