Overview

Dillon dynamometers and tension meters are used within the public utility for a variety of tasks including telephone and electric power line sagging by helping to reduce man hours on site and providing accurate tension readings.

While erecting an overhead line, it is very important that the conductors are under a safe tension. If the conductor wires are too stretched between supports in a bid to save conductor material, the stress in the conductor may reach unsafe value and in certain cases the conductor may break due to excessive tension. Over tensioning of the conductors also puts great strain on the supporting poles so in extreme weather conditions this can mean poles or support collapsing under the increased strain. In order to permit safe tension in the conductors, they are not fully stretched but are allowed to have a dip or sag. In an overhead line, the sag should be adjusted so that tension in the conductors is within the recommended safe limits.

The tension is governed by the conductor weight, effects of wind and ice loading plus ambient temperature variations. It is a standard practice to keep conductor tension at less than 50% of its ultimate tensile strength i.e. minimum factor of safety in respect of conductor tension. Ensuring you have the conductor under the correct tension will mean that you will increase the service life and reduce overall maintenance costs as you will be minimising fatigue and storm damage.

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