Conductor Stringing of 230kV Overhead Electrical Power Transmission Line

230kV Conductor Stringing and Erection Procedure

It should take special care that during the stringing of the phase conductor and earth wire to ensure that no contact is made with the ground or any obstacles such as walls, fences, or buildings etc., nor shall they be over-strained during this process. 

Drum battens shall not be removed until conductor drums are properly mounted at the drum station on the line and the battens shall be immediately refitted to the drums if any surplus conductor is left thereon. Drums will be transported and positioned on station with the least possible amount of rolling. 

The conductors, joints and clamps shall be erected in such a manner that no bird caging, over tensioning of individual wires or layers, or other deformation, or damage to the conductors shall occur. 

Clamps or hauling devices shall, under erection conditions, allow no relative movement of strands or layers of the conductor. If required by the Employer, this property shall be demonstrated by actual tests. 

It should make suitable arrangements for temporary guying of supports where necessary. Suitable plates (detachable or otherwise) shall be provided on the supports for the attachment of any temporary guys. The additional loads imposed on specific support during conductor stringing by the use of temporary guys shall be calculated prior to conductor stringing commencing. 

Each conductor shall be clamped in at suspension points and the adjacent spans fitted with spacer dampers or vibration dampers at a concurrent operation, after having been sagged and tensioned off at section supports. The maximum time period between clamping-in and fitting of spacer dampers or vibration dampers shall not exceed 36 hours, or such other time agreed with the Engineer. 

If this period is exceeded the Employer may take a random inspection of the unclamped and lowered conductor and if necessary the cutting out and replacement of any suspect conductor.