Repair/overhaul of 0.4 – 220 kV OHL

Regulations require that OHL on wood poles shall undergo repair/overhaul at least once in 5 years and OHL on reinforced and metal poles - at least once in 10 years.

During OHL repair/overhaul, parts of poles or grating of metal poles’ components are to be replaced.

ESS OHL repair/overhaul includes but is not limited to the following operations:  

- restoration of reinforced foundations of metal poles; formwork construction, if necessary;

- inspection and tightening of bolted connections and anchor bolt nuts;

- removing gaps between a pole foot and a foundation;

- cleaning metal poles from corrosion; painting metal poles;

- replacing metal grating damaged by corrosion; welding;

- restoration of reinforced components’ waterproofing with breaking up the soil;

- alignment of reinforced/metal pole top along the axis;

- repair and replacement of reinforced poles;

- replacement and alignment of vibration dampers;

- replacement of conductors and lightning protection ropes;

- inspection of conductors in bolted clamps;

- replacement of suspended line reinforcement in strain and suspension droppers;

- replacement of rope suspension and terminal clamps;

- replacement of damaged insulators;

- cleaning insulators from contamination;

- replacement of end caps in cross-arms with pin insulators;

- conductor connection in loop conductors and spans;

- rope connection in spans;

- inspection and repair of grounding devices;

- inspection and replacement of OHL electric accessories;

- reconstruction of OHL sand and crushed stone berms and blind areas;

- cleaning the route from bushes, trees and debris;

- restoration of pole numbering, phase coloring, fixing placards and tables.

Upon Customer request, Energy System Services carries out complete survey of overhead power lines which include the following operations:

- visual and instrument aided survey including photo recording of defects;

- current spreading resistance test for grounding devices;

- energized line inspection using a Man Lift;

- measuring reinforced foundations and poles’ concrete strength;

- measuring pulling of tension wires;

- measuring inclination of pole top along and across OHL axis;

- measuring conductor sag and distance to the ground and crossing objects;

- measuring actual coordinates of the poles;

- measuring corrosion and residual thickness of poles’ metal components, etc.