Ashutosh Ambey's Post

Handling of Conductor and Earth wire The running blocks shall be suspended in a manner to suit design of the cross-arm. All running blocks specially those at the tensioning end, will be fitted on the cross arms with jute cloth wrapped over the steel works and under the sling to avoid damage to the slings as well as the protective surface finish of the steel work. In case, section towers are used even for temporary terminations, if this be unavoidable, they shall be well guyed and steps shall be taken to avoid damage. The drums shall be provided with a suitable breaking device to avoid damage, loose running out and kinking of the conductor. The conductor shall be continuously observed for loose or broken strands or any other damage. When approaching end of a drum length at least three coils shall be left when the stringing operations are stopped. These coils shall be removed carefully and if another and if another length is required to be run out a joint shall be made as per the recommendations of the conductor manufacturers. normally, the joints shall be so made that these are not required to pass through running out of blocks, the joints will be protected with suitable joint protector sleeves. The conductors, joint 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 conductors. Repairs to conductors, in the event of damage being caused to isolated strands of a conductor during the course of erection, if necessary, shall be carried out during the running out operations with repair sleeves. Repairing of conductor surface shall be done only in case of minor damage, scuff marks etc, keeping in view both electrical and mechanical safety requirements. The final conductor surface shall be clean, smooth and shall be without any projections, sharp points, cuts, abrasions etc. Repair sleeves may be used when the damage is limited to the outermost layers of the conductor. Derricks shall be used where roads, rivers, channels, telecommunication or overhead power lines, railways, fences or walls have to be crossed during stringing operation. it shall be seen that normal services are not interrupted or damage caused to property. Shut down shall be obtained when working at crossing of overhead power lines. The proposed transmission lines may run parallel for certain distance with the existing 400 KV, 220 KV & 132 KV lines which will remain energised during the stringing period. As a result, there is a possibility of dangerous voltage build up due to electromagnetic and electrostatic coupling in the pulling cables, conductors and earthwires which though comparatively small during normal operations can be severe during switching and ground fault conditions on the energised lines.

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