Engineering Summary: Kandahar Breshnakot EPC Sub-Contract – KDBK 73.1010

The project involves the construction of a new 110/20kV substation in the existing Kandahar Breshnakot substation, located in Kandahar, Afghanistan. The substation is designed to provide reliable and efficient power supply to the region. The project includes the demolition of the existing substation and the construction of a new substation with a three-diameter one-and-a-half-breaker 110kV switchyard. The substation will have four 110/20kV step-down transformers, two of which are currently installed and secured on site, while the other two are kept as spares. The substation will also have four 20kV switchgear containers, two of which are type A1 and A2, and two of which are type B1 and B2. The project scope includes the construction of a two-short-span single-circuit 110kV transmission line for connecting the new substation to the existing 110kV transmission line. The existing 110kV transmission line span that crosses the canal will be disconnected and reconnected to the new transmission line on the north side of the canal. The existing 110kV substation will be removed and disposed of after the new substation is energized. The project also involves the installation of new 20kV circuits from the existing generators to the new 20kV switchgear, as well as the removal of existing 20kV circuits from the existing switchgear. The ground grid will be interconnected between the generating station ground grid and the substation ground grid. The step-up transformers at the generating stations will be retained. The project includes the construction of a new control room and the installation of new 110kV relay/control panels, metering panels, battery and battery chargers, AC/DC station service equipment, remote control panels for the new 20kV switchgear, and PLCC panels. The project also includes the installation of two fused disconnect switches and station service transformers to provide for the primary and secondary AC station service sources. The transition from the existing 110kV to the new 110kV substation and the existing 20kV distribution system to the new 20kV distribution system has been carried out in a systematic manner to minimize supply interruptions to the ultimate customers. The project has been executed in accordance with the approved outage and reconnection schedule. The project scope for the subcontractor began and ended at the existing 110kV structure north of the canal west of the substation for the 110kV transmission line configuration work. The subcontractor's scope of work also began and ended at the QSK-60 switchgear existing circuits terminations for the one 20kV circuit from the new 20kV switchgear feeder breaker, and at the MTU switchgear circuit terminations for the two 20kV circuits from the new 20kV switchgear feeder breakers. The project has been completed in accordance with the approved project schedule, and the new substation is now operational, providing reliable and efficient power supply to the region.