Jiangsu Zhongtian Technology Co., Ltd
3 / 5
Damping Scheme
1. Summary
The project-data are as the table below. Conductor/Cable Type:
ACSR Rail
Stranding direction of outer layer Direction Right
Conductor diameter mm 29.61
Cross section mm2
517.4
Conductor weight kg/km 1603.5
Rated tensile strength kN 116.07
Every day stress kN 23.535 22% of RTS
For ACSR Rail, the FR Stock-bridge damper series is recommended
to control the
Aeolian vibration of cable.
2. Damper Selection Method
The vibration damper, i.e. its mechanical properties
(impedance), must fit for the
conductor or optical fiber aerial cable. If not, either the
damper can cause damages at its
clamp on the conductor or aerial cable, or the damper itself can
be destroyed. The type
of Anti-Vibration Dampers (FR series) is Stock-Bridge. The
damper selection is based on
the conductor size, which determines its vibration frequency
range, including
characteristic impedance Z
Z= (T' x M)1/2
Where:
T: Everyday Tension of cable (KN)
M: Mass per unit length (kg/km) Z Damper type
Z 110 FR-2 110
Jiangsu Zhongtian Technology Co., Ltd
5 / 5
SPAN (M) Quantity of the damper in
the span (SET) Quantity of every side
(SET) 340 < SPAN 800 4 2 800 < SPAN 1200 6 3
1200 < SPAN Please refer to the ZTT for special design.
5. Installation position sketch: A. Damper placement scheme
(Suspension string):
B. Damper placement scheme (Tension string):
L1 L2 L3
L3L2L1
