How is pulling tension calculated for a 400kV cable?

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How is pulling tension calculated for a 400kV cable?

2025-08-16

The pulling tension for a 400kV cable must be calculated with extreme precision during the project's design phase. It's determined by the cable's conductor material and total cross-sectional area.

The maximum permissible tension ( $T_{ma x}$ ) is calculated as:

T_{ma x} = K \times S

$T_{ma x}$ is the maximum allowable pulling tension.
$K$ is the constant for the conductor material ( $50 N / m m^{2}$ for copper; $30 N / m m^{2}$ for aluminum).
$S$ is the total cross-sectional area of the conductors in $m m^{2}$ .

In addition to this calculation, other factors must be considered, such as the coefficient of friction (which can be reduced with professional lubricant), the number of bends, and the sidewall pressure the cable will experience when pulled around bends. Our puller-OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioners feature advanced electronic control systems that can be programmed with these values to ensure the pull never exceeds the calculated limits.

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