Engineering, 2013, 5, 101-103
doi:10.4236/eng.2013.51b018 Published Online January 2013 (
Copyright © 2013 SciRes. ENG
A New Type of Damper and It s F iel d Tests on Ice-coating
Transmission Lines
Wan-li Zhong1, Wei Wang1, Hang-hang Chen2, Wei Luo2 , Yun-chao Song2
1Electric Power Research Institute of Guangdong Power Grid Company, Guangzhou, China
2Power and Mechanical Engineeri ng School, Wuhan Universit y, Wuhan, China
Received 2013
The paper developed a type of damper with damping additive, of which the field tests were performed on 220kV trans-
mission line to stud y its da mping ef fects on vibr ation of transmission lines. First, based on the common damping mea-
surements, a scheme of filli ng the damping age nt in conventional damper is proposed to suppress the vibration ampli-
tude of the phase/ground line, thus reduce the dynamic stress of the towers and lines and decrease the fatigue da mage of
the system. Finally, the developed dampers were installed on a 220kV transmission line in Guangdong Province. The
on-line monitoring data show that and the dampers are capable of suppressing the variation of pitch angle and yaw an-
gle of the line, thus verify the effectiveness of the proposed damper.
Keywords: Tra nsmission lines ; Damper ; Da mping fl uid ; Iced trans mission line ; Vibra tion
1. Introduction
Transmission line is the key component of the power
grid system, thus its structure strength and reliability is
impo rtant fo r guarant ee the sa fety of p ower tra nsmis sion
system. Common disasters of the transmission line sys-
tem include ice coating, galloping and other types of
win d-induce d vibration, et. a l.
There are generally two type of icing disasters for the
transmission line. One is due to the static stre ss o f tower
and wires exceeding the allowable stress value, when t he
ice weights up to several times of that of the wires. In
this case, tower collapsing and lines broken may occur.
For instance, in early 2008, when the rare snowing and
freezing weather occurred in southern region of China,
icing disasters leaded to a wide range of power supply
interruption [1].
The second type of disaster is galloping of transmis-
sion line, which is a type of large amplitude (typically
from 0.1 to 1 times of the sag of the span) and low fre-
quency (from 0.10Hz up to 3Hz) wind-induced vibration
due to wind loads action on an ice-coated or wet snow
accretion on the conductors. Comparing to other types of
win d-induced vibration of overhead power transmission
lines such as Aeolian vibration, turbulent wind-induced
buffe ting, gall oping is the most noticeable and may cause
such serious problems as phase-to-phase flashovers due
to the short distances between phases, broken conductors,
snapping of the line-to-line spacers, damage of insulator
chains, and tower bolt failures or even the collapsing of
whole tower [2].
Furthermore, there is one more type of harmful phe-
nomenon, sustained small amplitude vibration of the
tower-line syst em. Thi s will c aus e fa tig ue d ama ge o n the
tower and l ine, which is caused b y dyna mi c stre ss.
2. Disaster Prevention Approaches
There are types of measurements to prevent disaster of
icing transmission line, such as thermal de-icing, me-
chanical de-icing, et. al.
(1) Thermal ice melting method: Using the principle
of Joule effect. Improve the conduct temperature through
increasing the load current and making short-circuit cur-
rent, or de-icing with high-frequency high-voltage exci-
tation. In 2001, Joshua D.McCurdy adopted an excitation
at approximately 33kV, 100 KHz to melt ice [3]. The ice
is a lossy dielectric at these frequencies which can be
(2) Mechanical de-icing method: Using mechanical
force (manually or automatically). In the early time me-
chanical de-icing was done by human being. This me-
Copyright © 2013 SciRes. ENG
thod is simple but with low efficient and insecure. No-
wada ys the hi gh-tech robot is being developed to replace
human being by de-icing, in China, Hunan University
develops a de-icing robot, which is an effective way of
mechanical de-icing [ 4] .
(3) Other new technology de-icing method: Many
constructive ideas have been proposed, such as applying
hydrophobic materials on transmission line, using laser
to melt ice[5] , e t, al.
3. Damper Structure
The new da mper structure prop osed in this paper co nsists
of four parts. A fixed-length high-strength galvanized
stranded wire is fixed with iron-casting hammer that has
hollow cylindrical shape at both ends, and the hammer is
filled with damping agent, while a clamp is used to fix the
damper to the phase/ground wire. This structural can be
transformed on the base of FR, FD-type da mper .
The damping factor varies according to the composi-
tion of the damping agent. We adopt different damping
agent according the vibration-controlled objectives in
different running situation.
The vibration damper is fixed in the transmission line
through the clamp. When the transmission line damper
vibrates, the damper installed in the trans mission line ha s
the upper and lower vibration. The steel strand wire con-
nected to the hammerhea d bends up and down becaus e of
inertia of the hammerhead. The continuous friction
between steel strand wire and damping agent has been
reducing the energy, as well as the continuous friction
between damping agent and molecule inside the cylin-
drical hammer. According to the law of conservation of
energy, the vibration of the transmission line will be re-
duced. The greater amplitude of the steel strand wire is,
the greater t he energy will be damped.
For the vibra tion of transmission l ine, the highest point
of vibration amplitude is called the crest, while the point
stays in the original position is named the node. The dis-
tance between two adjacent nodes is called the
half-wavelength of the vibration. The damper is usually
installed in the crest points that make the biggest swing-
ing amplit ude, thus co ns umes a s much e nergy as possible.
Installation distance is determined by the maximum
half-wavelengt h and minimum half-wavelength.
max max
min min
22 22
 
 
 
 
 
 
 
 
 
is the damper installation distance(plywood
centerline of the clamp centerline to the damper distance);
max is the maximum half-wavelength of the vibration;
min is minimum half-wavele ngth of the vibr atio n.
4. Field Application Tests and Data Analysis
To test the effects of the damper, field tests have been
performed on a 220kV high voltage transmission line
system in Shao Guan of Power Grid Company of
Guangdong Province. There dampers were fixed along
one span of phase line. To comparative evaluate the
damping effects, the dampers were only installed on
phase C. Based on According to the monitoring and
data col lec tion ter mi na l.
Based on the on-line monitoring system of the test
line, we collected three parameters, namely the wind
yaw angle, pitch angle, and the tension of the line dur-
ing an icing- deicing cycle from 1st to 10th January in
Fig. 1, Fig. 2 and Fig. 3 indicate the time curve of
the pitch angle, wind yaw angle, and tension. For the
test span, the phase C is installed vibration dampers,
while phase A is not. Compare and analyze the three
parameters of phase A and phase C and make a statis-
tical analysis of tension, pitch angle and wind yaw an-
gle of them, we can draw a conclusion that, after in-
stalling the vibration damper, the tension, pitch angle
and wind yaw angle are reduced by 72.0%, 88.9%, and
2.0%, respect ively.
Phase A
Phase C
Relative inhibitory
ratio of phase C rela-
tive t o phase A%
Max relative change of
pitch angle(°)
Max relative change of
wind yaw angle (°)
Max te nsionN
Figure 1. Time history of pitch angle of phase lin es A and Phase C
Copyright © 2013 SciRes. ENG
Figure 2. Time history of wind yaw angle of phase lines A and Phase C
Figure 3.Time history of tension force T of ph ase lines A and Phase C
5. Summary
Through the field tests of the damper application and
collected data analysis, we can conclude that the pro-
posed damper with damp agent is capable of suppressing
the vibration of transmission line effectively, thus re-
duce the fati gue da mage , and p rolong the s ystem ser vice
life. Moreover, this type of damp does not need power
supply for it consumes vibration energy passively.
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