Planning and organizing workDrawing work execution schedule
Preventive Maintenance of Low Voltage Overhead linesInspection Checklist
CHECK LISTS/S NumberInspection DateDayMonthYearChecklist NumberLocationTeam LeaderStaff NoFeeder & Primary Substation NameSupervisorStaff NoCircuit InspectedDepotArea
Defect DescriptionCircuit InspectedPole Number1234CONDUCTORSPVC insulation on conductor peeling off *Clash marks /Spacers on conductors*Conductors frayed/in poor stateNon uniform size of the phase conductors *Foreign Object on the conductors*C.S.A. of Neutral conductor smaller than phase conductors*Aerial Bundled Conductor(ABC) poorly suspended/TerminatedSpans lengths more than 50m (164’)*Poor sag due to low conductor tension
Jumpers & connections1.10Jumper /Tee – off connections poorly done1.11Conductor/jumper joints in poor condition1.12*Jumper cross section area smaller than line conductor 1.13*More than one joint on conductor within span1.14*Aluminium/Copper conductors connection within span1.15*Neutral jumper connection not Double line tapped1.16*Densoltape not applied on Aluminium/Copper connections
2CLEARANCES2.1*No guardnet at Railway/Telecom line crossing2.2Line strung on same side of Road/Street as Telephone line2.3Angle of crossing 2.3.1*Telecom. lines less than 45o2.3.2Public Roads & Railways less than90o2.4Height of conductor across2.4.1*Public Roads < 5.8m (19')2.4.2*Private Land < 5.2m (17')2.4.3*Telephone lines < 0.6m (2’)2.4.4*Railway line < 9.2m (30')2.5Separation between LV 2.5.1Conductors <0.305m (1')2.5.2& 11kV conductors< 1.4m(4’7’’)2.5.3& 33kV conductors< 2.28m ( 7’5’’)2.5.4& 66kV conductors< 3.2m (10’6’’)
3INSULATORS AND ACCESSORIES3.1*Shackle insulators broken/damaged3.2*Conductor off shackle insulators3.3Shackle insulator loose in ‘D’ Iron3.4*Shackle straps deformed or broken3.5D/Iron, ABC suspension/Dead end clamp assembly corroded/damaged/ incomplete
4POLES4.1*Location posing danger to traffic4.2Not easily accessible4.3*Leaning/Crooked/out of alignment4.4*Pole planting depth <1.6m ( 5’3’’)4.5*Soil eroded at pole base4.6*Residues, silt, water retention, garbage etc. at base4.6Wooden pole4.6.1*Rotten/Broken/Damaged4.6.2With missing Pole Caps/banding tape4.6.3Of insufficient height/diameter4.6.4*Termite/woodpecker attack evident4.6.5*Condition of strut-pole poor4.7Concrete poles 4.7.1*Cracked/Concrete chipping off4.7.2*With broken base/foundation4.8Steel poles4.8.1*Rusted/Damaged4.8.2Presence of Wasps/bees evident in hollow column
5STAYS5.1*Stay wire in poor state/not tensioned5.2Size of Stay wire < 4/8‘’5.3*Stay wire short circuiting LV conductors5.4*Insulator shattered/missing5.5Stay insulator mounted < 3m (10')from ground level5.6*Stay rod damaged/vandalized5.7*Soil eroded at stay base
6EARTHING 6.1*Earth resistance greater than 10 6.2PVC earth slat/guard missing/in poor condition6.3*Earthing system exposed/damaged/vandalized6.4Earthing system connections (testing point etc.) corroded6.5Earthing lead cross sectional area < 16 mm2cu.
You've reached the end of your free preview.
Want to read all 19 pages?
- Spring '18
- Professor Obura Oluoch
- The Work, Upper Hill