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- Aug 31, 2018 -

The main purpose of spacers for split conductors of transmission lines is to restrict the relative motion between sub-conductors and to maintain the geometry of split conductors in normal operation.

Two, four or more split conductors are used for each phase of long-distance and large-capacity EHV transmission lines. At present, 220KV and 330KV transmission lines use two-splitting conductors, 500KV transmission lines use three-splitting and four-splitting conductors. UHV transmission lines with voltage higher than 500KV use six-splitting and more splitting conductors. In order to ensure that the spacing of splitting wire bundles remains unchanged to meet the electrical performance, reduce the surface potential gradient, and in the case of short circuit, there is no electromagnetic force between wire bundles, causing mutual attraction and collision, or even causing instantaneous attraction and collision, but after the accident is eliminated, it can be restored to the normal state, and therefore separated in the interval. Spacers are installed at a distance. The installation of spacers can also inhibit the oscillation of the secondary span and the breeze vibration.

According to the working characteristics of spacers, they can be divided into two categories: damping spacers and non damping spacers. Damping spacer rod is characterized by the use of rubber as damping material at the movable joint of spacer rod to consume the vibration energy of conductor and produce damping effect on the vibration of conductor. Therefore, the spacers are suitable for all regions. However, considering the economy of the transmission line, this kind of spacer is mainly used for the line in the area where the conductor is prone to vibration. Undamped spacer rods have poor seismic performance and can be applied to lines in areas where vibration is not easy to occur or as jumper spacers.

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