General Condition

Element Units Abu

Dhabi Al Ain

Maximum ambient outdoor air temperature (shade) °C 49 50

Maximum daily average ambient shade temperature °C 40 40

Maximum monthly average ambient shade temperature

°C 37 37

Maximum annual average ambient shade temperature: °C 30 30

Minimum ambient temperature: °C 7 6

Storage temperature of equipment °C -10 to +70

Minimum barometric pressure (at sea level): Hecto Pascal 990 992

Maximum barometric pressure (at sea level): Hecto Pascal 1030

1030

Maximum ambient relative humidity: % 100 100

Minimum ambient relative humidity: % 1 1

Average annual rainfall: mm 85 85

Maximum annual rainfall: mm 255 165

Maximum daily (24 h) rainfall: mm 34 40

Maximum hourly rainfall: mm 80 50

Maximum seawater temperature: °C 36 -

Minimum seawater temperature: °C 20 -

Maximum ground temperature at 1 m depth: °C 40 41

Design Wind Speed: Km/h 160 160

Seismic load acceleration factor (horizontal) g 0.2 0.2

Seismic coefficient / importance factor (according to Zone 1 of Uniform Building Code):

0.075 / 1

0.075 /

Solar Radiation: W/m2 973 876

Isokeraunic Level: 7 thunderstorms

per year

Electrical Design Fundamentals

Description 220 kV

Phase to Earth Clearance 1700 mm

Minimum Safety Clearance – Conductor/ Live parts

To Walkways 8000 mm

To Public Road/ Highway 9000/1000 mm

To building, roofs, structures, light poles 6000 mm

Over pipeline 9000 mm

Minimum horizontal clearance b/w live part

Solid panel wall with a min. height of 1800 mm 2100 mm

wire mesh 2200 mm

Rail, chain, rope with a min. height of 1100 mm 2400 mm

substation perimeter walls of min. 1800 mm height 3600 mm

Live Conductor Crossings

11kV/33kV 5000 mm

132 kV 5000 mm

220 kV 5000 mm

400 kV 5000 mm

Tele-Communication Line 5000 mm

Minimum Clearances of/to Underground Cables & Cables to

other Services

Horizontal Cable Centre Line to Cable Centre Line

Between circuits 150 cm

Between phases (SC) 45 cm

Vertical Ground Surface to Cable Bottom 110 cm (in trough)

Horizontal/Vertical from Cables to other Services >200*,>60**/>100 (cm)

Note:

For OHTLs conductor clearances the maximum swing at maximum conductor sag of the concerned

OHTL conductor shall be considered (refer to DIN VDE 0210).

* distance from piles (horizontal)

** at cable crossings the space between the cable circuits shall be filled with CBS compound