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 2.3 Shielding Of Phase Conductors 2015-09-04
    Shield wires form part of the overall design of an overhead line and are used to protect(or 'shield') the phase conductors from dircect lightning striks. If properly located,the shield wires provide an intercepting path for linghtning strik...
 2.2 How Lightning Interacts With An Overhead Line 2015-09-03
    Lighting interacts with overhead lines in the following two basic ways: · Direct strikes to the phase conductor,shield wire,or tower. · Nearby strikes to ground. When a direct strike terminates on the phase conductor . and not the shield wi...
 2.1 THE PHYSICS OF LIGHTNING 2015-09-03
    INTRODUCTION Lightning faults on overhead line make up as mush as 30% of total transmission line faults annually.A large percentage of these can be caused by corrosion of the lightning strikes a tower with poor earthing. The resulting fault...
 1.11 HARDWARE 1.12 CONCLUDING REMARKS 2015-09-02
    HARDWAREThe line hardware should carefully be inspected for missing,loose,corroded or travelling split pins,’W’ clips,and lock nuts or fasteners. Assembly wear,suitability,corrosion or discoloration of the hardware should also be recorded...
 1.9-1.10 SHIELD WIRE 2015-09-01
    1.9 SHIELD WIRE The earth conductor is used to provide shielding of the overhead line against lighting. It is located above the phase conductor in order to perform this function. The condition of the earth conductor should be assessed in t...
 CONDITION MONITORING OF IN-SERVICE INSULATORS 1.8 2015-09-01
    1.8.2 POLYMERIC INSULATORS As described earlier,typical damage to polymer insulators can occur in the following ways: ·Surface erosion.Puncturing of the sheds. ·Splitting of the sheds. ·Damage to the end fitting seal. ·Exposure to the co...
 1.8 CONDITION MONITORING OF IN-SERVICE INSULATORS 2015-09-01
    1.8 CONDITION MONITORING OF IN-SERVICE INSULATORS The cost of insulators is thought to amount to approximately 5%of the cost of the line,yet insulators are responsible for approximately 95%of line fault. It therefore becomes important to kn...
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