Twin, Tri and Quad Damping Spacers up to 500 kV

  • Standard IEC 61854
  • Material: Aluminium Alloy (Clamp); Aluminium Alloy (Body); Hot Dip Galvanised Steel (Bolts and Nuts)
 BUNDLE OF CONDUCTORS CONDUCTOR RANGE   WEIGHT
MÍN MÁX
Twin 400 mm 2 21.0 a 36.8 mm 23.6 a 39.0 mm 2.60 a 2.86 kg
Twin 450 mm 2 21.0 a 36.8 mm 23.6 a 39.0 mm 2.68 a 2.94 kg
Tri 450 mm 3 21.0 a 36.8 mm 23.6 a 39.0 mm 4.28 a 4.67 kg
Quad 450 mm 4 21.0 a 36.8 mm 23.6 a 39.0 mm 5.70 a 6.22 kg

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Product Description

 BUNDLE OF CONDUCTORS CONDUCTOR RANGE   WEIGHT
MÍN MÁX
Twin 400 mm 2 21.0 a 36.8 mm 23.6 a 39.0 mm 2.60 a 2.86 kg
Twin 450 mm 2 21.0 a 36.8 mm 23.6 a 39.0 mm 2.68 a 2.94 kg
Tri 450 mm 3 21.0 a 36.8 mm 23.6 a 39.0 mm 4.28 a 4.67 kg
Quad 450 mm 4 21.0 a 36.8 mm 23.6 a 39.0 mm 5.70 a 6.22 kg

The more economical solution to increase the power capacity on the overhead lines is the increasing of the voltage. It makes necessary the use of big diameter conductors or simulate them by multiplying several conductors to maintain the electric field gradient on the proximity of the conductor standard diameter on a reasonable level the and avoid the losses because of the corona discharge, with the subsequent electromagnetic emissions. So, each phase will be constituted by twin, triple, quad or more bundle conductors.

To maintain the geometry of these bundles along the span and to avoid contact between sub-conductors an accessory consisting of a metallic body with some clamping devices to the sub-conductor bundle named space, is used.

Consequently, the spacer has to support all the efforts due to its function, such as aeolian movements of the sub-conductors, in particular the aeolian vibration and sub-span oscillation, as well as the short-circuits effects without distorting the geometrical bundle nor damaging the conductor on the clamps.

The type of joints on the spacer clamps, if they exist, and their inertial characteristics can constitute a barrier to the vibration transmission along the sub-conductors and make the use of dampers completely inefficient on the ends of the span, increasing the risk of breakage by fretting fatigue, either on the clamps on the end of the span or on the spacers themselves.

This problem could be solved by introducing dispersing articulations between the clamps and the spacer body and to optimise for this function the geometry and inertias, constituting a damping spacer.

A damping spacer is able to disipate vibration energy on the sub- conductors by distorsion movement of some elastomer parts inserted between the clamp arm and the spacer body and these constitute a rotary mechanism or joint that allows a relative movement between both parts of the spacer, in particular and principally the rotation of the arm in relation to the rotary axis.