33KV Single Core Middle Voltage Electric Cable 300MM2 COPPER / XLPE / AWA / PVC Underground Cable

Item

Units

Required

Tendered

1.

Voltage phase to phase (U to BS 6622:2007)

kV

33

33

2.

Number of cores

One

One

3.

Conductor

• Cross sectional area

mm²

300

300

• Material

Copper

Copper

• Design

round

• Overall Diameter

mm

20.6

• Welding or soldering temp

⁰C

≤40

4.

Conductor screen

• Material

Semi-conductive XLPE

• Thickness Approx:

mm

0.8

5.

Insulation

• Material

XLPE

XLPE

• Thickness Approx:

mm

8.0

6.

Core Screen

• Material

Semi-conductive XLPE

• Thickness ,approx.

mm

1.0

• Diameter over screen

mm

40.2

7.

Metallic Layer

• Material

Copper tape

• No. of Wires or Tapes

mm

1

• Size. of wire or Tape

mm

0.12

• Cross Section

mm²

32

8.

Metal sheath

Not Applicable

Not Applicable

• Material

• Nominal Thickness

mm

• External Diameter

mm

9.

Lead alloy Sheath Composition

• Tin

%

• Cadmium

%

• Antimony

%

• Lead

%

10.

Aluminum Armour

• Maximum Working Hoop

kPa

165

• Stress

172

• 0.1% Proff Stress

kPa

235

• Purity

%

99.9

• Plumbing Temperature

⁰C

25

11.

Outer Cover

• Material

PVC

• Minimum Average Thickness

mm

2.7

• Type of termite Repellent

Additive

• UV Protected

Yes

Yes

12.

Completed Cable

• Overall Diameter, approx

mm

54.4

• Weight per Meter

kg

5.5

• Drum Length

m

500

• Nominal

500

13.

Cable Drums

• Overall Diameter

m

2.2

• Width

m

1.4

• Weight Loaded

kg

120

14.

Conditions upon which current carrying

Capacities laying in trefoil formation are based

• Axial spacing between phase cable

mm

50

• Axial spacing between circuits

mm

600

• Soil thermal resistively

Deg.

25

• Ground Temperature

⁰C

35

• Air Temperature

⁰C

40

• Burial depth

m

1.2

• Type of earth bonding :Single Point

Yes/No

YES

15.

Maximum dielectric stress at the Sector screen (assumed smooth)

kV/mm

3.15

16.

Minimum radius of bend around which can be laid

• Laid direct

m

0.9

• In ducts

m

0.9

• In Air

m

0.8

17.

Nominal Internal diameter of pipes or ducts through which cable may be pulled.

mm

80

18.

Maximum D.C Resistance of conductor per meter of cable 20 ⁰C

• Of conductor

microhm

60.1

• Of metallic layers

microhm

592

19.

Maximum A.C Resistance of conductor per meter of cable at maximum conductor temperature

microhm

77.7

20.

Insulation Resistance of cable per core

• 20 ⁰C

MΩ

10000

• At max. rated temp

MΩ

10000

21.

Equivalent Star Reactance per meter of 3-phase Circuit at nominal frequency

microhm

0.227

22.

Maximum Electrostatic capacitance per meter of cable

pF

246

23.

Maximum Charging Current per core per meter of Cable at nominal voltage U₀

A

0.01

24.

Current Carrying Capacity Based on the conditions specified

Main Transformer Feeders

A

800

800

Line Feeders

A

400

400

25.

Maximum Conductor Temperature

• Laid direct in Ground

⁰C

90

• Drawn into ducts

⁰C

90

• Erected in air

₀C

90

26.

Conductor short circuit current carrying capacity for one second, cable loaded as above prior to short circuit and final conductor temperature of 250 ⁰C

kA

25

25

27.

Metallic layer earth faulty current Carrying Capacity for one second, cable loaded as above Prior to earth fault and final screen temperature

kA

16

16

⁰C

250

28.

Maximum dielectric loss of cable per meter of three phase circuit when laid direct in the ground at nominal voltage Uo, nominal frequency and operating oil pressure at maximum conductor Temperature

W/m

0.03

29.

Maximum dielectric loss angle of charging VA of Cable when laid direct in the ground at nominal voltage ,Uo,normal frequency at

tan d

0.001

• A Conductor temperature of 20 ⁰C

0.001

• Maximum Conductor Temperature

tan d

0.001

30.

Maximum dielectric loss angle of charging VA of cable at normal frequency conductor temperature of 20 ⁰C at

• 50% rated voltage Uo

tan d

0.001

• 125% rated voltage Uo

tan d

0.002

• 200% rated voltage Uo

tan d

0.002

31.

Metallic layer loss (including amour if applicable) of cable per meter of three-phase circuit at nominal voltage Uo and normal frequency at the circuit rating stated above

W

5.2

32.

Horizontal distance between cable supporting racks

1000mm

33.

Creepage distance of sealing and porcelain

Specified

mm

15

Guaranteed

mm

15

34.

Type test certificate

Yes

Yes

35.

Partial discharge at 2U₀

pC

<=5

<=5

Construction

Thickness (mm)

Diameter (mm)

1---Copper conductor

--

20.6(+0.1,-0.1)

2---Copper screen

0.8

22.3

3---XLPE Insulation

8.0

38.2(+0.5,-0.5)

4---Insulation screen

1.0

40.2

5---Copper tape screen

0.12

40.6

6---PVC inner sheath

1.4

43.4

7---Aluminum wire amour+ aluminum tape

2.5+0.3

49.0

8---PVC outer sheath

2.7

54.4(+2.0,-2.0)