Charikar and Doshi220/20 kV Substations

Michael A BreckonJuly 2005

Location of Doshi and Charikar

DSH

Background - Doshi Substation

Doshi is a 220/20 kV Substation for distributing power at 20 kV. Will be supplied by the PUL to CHM 220 kV dble cct Tx lineWill provide 20 kV to households within approximately 60 km radius of DoshiWill have a single 5 MVA 220/20 kV transformer installed

5 MVA 220/20 kV Transformer will enable:8,300 households to be supplied at 600 VA per household peak demand (ADMD)5,000 households to be supplied at 1,000 VA per household peak demandThese figures exclude possible industrial, commercial and agricultural load

Doshi Single Line Diagram

Doshi Substation – Key Features

• Outdoor 220 kV double bus, conventional technology, low cost with good reliability and serviceability

• Single 220/20 kV 5 MVA transformer with space allowed for up to 2 x 16 MVA transformers to be added at a later date

• Indoor 20 kV metalclad bus and switchgear, to be located in a switchgear room adjacent to the control room

• Control room includes heating and cooling, lighting, water and sanitary supply

• Full SCADA and remote CSCS control allowed for, with network communication via OPGW

• Technical specifications, schedules of quantities, technical schedules and budget cost have been prepared

Doshi Substation – Estimated Cost

Item Cost USD million• 220 kV Switchgear 1.5• Power Transformer 0.3• 20 kV Switchgear 0.2• Civil Works 2.5• Installation 0.4

Total 6.3

CHK

Background – Charikar Substation

Charikar is a 220/20 kV Substation for distributing power at 20 kV. Will be supplied by the PUL to CHM 220 kV dble cct Tx lineWill provide 20 kV to households within approximately 60 km radius of DoshiWill have two 16 MVA 220/20 kV transformer installed

2 x 16 MVA 220/20 kV Transformers will enable:53,000 households to be supplied at 600 VA per household peak demand (ADMD)32,000 households to be supplied at 1,000 VA per household peak demandThese figures exclude possible industrial, commercial and agricultural load

Charikar – Single Line Diagram

Charikar Substation – Key Features

• Outdoor 220 kV double bus, conventional technology, low cost with good reliability and serviceability

• Two 220/20 kV 16 MVA transformers with a capacity to be subsequently up-rated as the load develops

• N-1 Reliability - Failure of one transformer will not mean a loss of supply

• Indoor 20 kV metalclad bus and switchgear, to be located in a switchgear room adjacent to the control room; two incomers and two local service transformers 20/0.4 kV (n-1 reliability)

• Control room includes heating and cooling, lighting, water and sanitary supply

• Full SCADA and remote CSCS control allowed for, with network communication via OPGW

• Technical specifications, schedules of quantities, technical schedules and budget cost have been prepared

Charikar Substation – Estimated Cost

Item Cost USD million• 220 kV Switchgear 1.5• Power Transformer 0.5• 20 kV Switchgear 0.4• Civil Works 2.5• Installation 0.4

Total 6.8

Questions?

michael.breckon@maunsell.com