7/30/2019 230kv-Switch-Yard-Check-List.pdf

1/2

230KV SWITCH YARD CHECK LIST

A. CIVIL

1. Grouting for all tower foundations is completed2. Grouting for all equipment foundations is completed3. All cable trenches are cleaned properly & covered with pre cast slabs4. All cable trench junctions are closed5. All earth pits are constructed and plastering is done6. Total Switch yard area is back filled and compacted7. Final back filling levels are noted8. 40mm metal is spreaded with a thickness of 40mm9. All fencing poles are fixed properly and painted10.Fencing mesh is laid properly11.Metering fencing is completed with gates and locks

B. ELECTRICAL

1. All towers structure foundations bolts are fixed as per drg.2. All towers structure foundation bolts are tightened properly3. All towers structures are erected as per drg.(Angles, Bolts, Washers, Spring washers & nuts)4. All equipment structure foundation bolts are fixed as per drg.5. All equipment structure foundation bolts are tightened properly6. All equipment structures are erected as per drg.(Angles, Bolts, Washers, Spring washers & nuts)7. All equipments are erected8. All equipments are named properly with standard painting9. Earth mat is laid for total Switch yard10.All cable trays support structures are treated with one coat of anti corrosive paint and 2 coats

of enamel paint

11.Earth mat is laid 2000mm away from fencing12.All towers are connected to earth mat by 75x12mm GI flat at 2 nearest locations13.All towers spikes are connected to earth pits by shield wire14.All equipment structures are connected to earth mat by 65X10mm GI flat at 2 locations15.All earthing joints are tightened propely16.All earthing joints are treated with anti corrosive paint17. All isolator mechanism boxes and earth switches are provided by separate auxiliary earth mat18.All equipments are connected to earth mat by 65X10mm at 2 locations19.All equipment junction boxes, mechanism boxes, etc.. are connected to earth mat by 50X6mm

GI flat at 2 locations20.All cable trays are connected to earth mat by 50X6mm GI flat all along the run

7/30/2019 230kv-Switch-Yard-Check-List.pdf

2/2

21.Earth flat along the cable trays are treated with anti corrosive paint22.All earth pits are excavated at a depth of 3mts23.All earth pits are located by GI/CI pipes24.Earth pits are filled with alternative layers of salt & charcoal for treated earth pits25.Transformer body is connected to nearest earth pits26.Transformer HV neutral is connected earth pit by 75X12mm Cu. flat27.Earth mat is connected to nearest earth pits28.Earth pit joints are tightened properly29.All Cable are laid properly and dressed properly30.All cables, cable glands are connected to earth flat by Cu. leads31.Earth pit resistances are measured and noted32.Individual earth pit resistance should be up to 1 Ohm(If the value is out of limit add the water

and measure once again)

33.Combined earth pit resistance should not be more than 0.5 Ohm34.All earth pits are covered with CI cover35.Individual earth pit resistances are noted by paint on respective earth pit with serial no.36.All power, control and relay panels are erected and earthed properly (CP, RP, ACDB, 220DCDB,

48V DCDB, SCADA, PLCC etc...)

37.Cable schedule is available38.Cable tagging is completed39.All testing activities are completed for all equipments40.All testing readings/reports are noted/collected41.Whether Switch yard is ready for taking Start Up Power