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Three Core 19/33KV Medium Voltage Steel Wire Armoured Cable

Three Core 19/33KV (Um=36KV) Armoured

Voltage: 18/30KV

Conductor: Copper or Aluminum

Operating Temperature: up to 90°C

Short Circuit Temperature: 250°C

Bending Radius: 15 x OD

Email: manager@hdcable.com.cn

Three Core 19/33KV  Medium Voltage Steel Wire Armoured Cable Application

The three core cables are designed for distribution of electrical power with nominal voltage Uo/U ranging from 3.6/6.6KV to 19/33KV and frequency 50Hz. They are suitable for installation mostly in power supply stations, indoors and in cable ducts, outdoors, underground and in water as well as for installation on cable trays for industries, switchboards and power stations.
CONSTRUCTION :

Three Core 19/33KV  Medium Voltage Steel Wire Armoured Cable Construction


Conductor: Plain annealed copper or aluminium complying with IEC 60228/BS 6360. Copper conductors shall be stranded (class 2) and aluminium conductors shall be either solid or stranded (class 2).
Conductor Screen: Extruded layer of semi-conducting cross-linkable compound is applied over the conductor and shall cover the surface completely. The minimum thickness is 0.3mm and the maximum resistivity shall not exceed 500 Ohm-m at 90°C.
Insulation: Insulation is of cross-linked polyethylene compound XLPE (GP8) conforming to BS 7655-1.3 or EPR (GP7), conforming to BS 7655-1.2.

Table 1. Insulation Thickness

Nom. Cross Section Area

Insulation Thickness at Nom. Voltage

3.8/6.6KV(Um=7.2KV)

6.35/11KV(Um=12KV)

8.7/15KV(Um=17.5KV)

12.7/22KV(Um=24KV)

19/33KV(Um=36KV)

mm²

mm

mm

mm

mm

mm

70 – 185

2.5

3.4

4.5

5.5

8.0

240

2.6

3.4

4.5

5.5

8.0

300

2.8

3.4

4.5

5.5

8.0

400

3.0

3.4

4.5

5.5

8.0

Above 500

3.2

3.4

4.5

5.5

8.0


Insulaton Screen: Extruded layer of semi-conducting cross-linkable compound is applied over the insulation. The extruded semi-conducting layer shall consist of bonded or cold strippable semi-conducting compound capable of removal for jointing or terminating. As an option, a semi-conducting tape may be applied over the extruded semi-conducting layer as a bedding for the metallic layer. The minimum thickness is 0.3 mm and the maximum resistivity is 500 Ohm-m at 90°C. The screen is tightly fitted to the insulation to exclude all air voids and can be easily hand stripped on site.

Inner Covering & Fillers: For cables with a collective metallic layer or cables with a metallic layer over each individual cores with additional collective metallic layers, semi-conducting inner covering and fillers shall be applied over the laid up cores. The inner covering is made of non hygroscopic material, except if the cable is to be made longitudinally watertight. The inner covering shall be extruded or lapped.

The approximate thickness of extruded inner coverings is given in Table 2:

Table 2. Approximate Thickness of Extruded Inner Coverings

Ficititous Diameter over Laid Up Cores

Approx. Thickress of Extruded Inner Covering

mm

mm

>

<

 

35

45

1.0

25

35

1.2

35

45

1.4

45

60

1.6

60

80

1.8

80

-

2.0

*The approximate thickness of lapped inner coverings shall be 0.6mm.

Metallic Layer: The metallic layer shall be applied over each core or applied as a collective screen. The metallic screen shall consist of either copper tapes or a concentric layer of copper wires or a combination of tapes and wires. The metallic layer provides an earth fault current path, capable of withstanding fault current to earth of 1000A for one second at maximum temperature 160°C. Copper wires are applied over the conducting water blocking layer with a minimum diameter of 0.5mm. And over the copper wires, copper tape with minimum thickness of 0.1mm can be applied helically with overlap.

Total cross section of copper wire screen is shown in Table 3.

Table 3. Minimum Total Cross Section of Copper Wire Screen & DC Resistance of The Screen

Nominal Cross-Section Area of Cable

Minimum Cross-Section of Copper Wire Screen Area

 DC Resistance of the Copper Wire Screen

mm²

mm²

mm

up to 120

16

1.06

150-300

25

0.72

400-630

35

0.51

Separation Sheath (for armoured cable): The separation sheath comprises a layer of extruded PVC, PE or LSZH. The nominal thickness is calculated by 0.02Du + 0.6mm where Du is the fictitious diameter under the sheath in mm. The nominal separation sheath thickness shall not be less than 1.2mm.
Armour (for armoured cable): The armour consists of galvanized steel wire applied over the inner covering with diameter specified as in Table 4. 

Table 4. Armour Wire Diameter

Fictitiious Diameter under the Armour

Armour Wire Diameter

mm

mm

>

<

 

 

25

1.6

25

35

2.0

35

60

2.5

60

-

3.15

Over Sheath: Overall sheath comprises a layer of extruded either PVC type 9 conforming    to BS 7665-4.2 or MDPE type TS2 conforming to BS 7655-10.1; LSZH can be offered as     an option. The over sheath is normally black in colour. When a DC voltage test is to be performed on the over sheath, a semi-conducting layer such as graphite coating shall be applied over the surface of the extruded over sheath. The nominal over sheath thickness is calculated by 0.035+D where D is the diameter immediately under the over sheath in mm. For cables with the over sheath not applied over the armour, the nominal over sheath thickness shall not be less than 1.4mm. And for cables with over sheath applied over the armour, the nominal over sheath thickness shall not be less than 1.8mm.

PHYSICAL PROPERTIES :

Operating Temperature: up to 90°C
Temperature Range: -5°C ( PVC or LSZH sheath ); -20°C ( PE sheath )
Short Circuit Temperature: 250°C (short circuit duration up to 5 seconds)
Bending Radius: 15 x OD

Table 5. Nominal /Operating /Test Voltages

Rated Voltage Uo/U

Operating Voltage (Um)

Testing Voltage (rms)

3.8/6.6KV

7.2KV

15KV

6.35/11KV

12KV

25.5KV

8.7/15KV

17.5KV

35KV

12.7/22KV

24KV

51KV

19/33KV

36KV

76KV

 

DIMENSIONAL DATA :

Three Core 19/33KV (Um=36KV)  Medium Voltage Steel Wire Armoured Cable

 

Nom. Cross- Section Area

 

Unarmoured Cables

Steel Wire Armoured Cables

Nom. Insulation Thickness

Copper Wire Screen Area

Nom. Sheath Thickness

Approx. Overall Diameter

Approx. Weight

Copper Tape Screen Area

Nom. Bedding Thickness

Nom. Armour Wire Diameter

Nom. Sheath Thickness

Approx. Overall Diameter

Approx. Weight

CU

AL

CU

AL

mm²

mm

mm²

mm

mm

kg/km

mm²

mm

mm

mm

mm

kg/km

35

8.0

16

3.1

60

3750

2880

6.5

1.7

2.5

3.2

74.9

9460

8700

50

8.0

16

3.2

65

5240

4260

6.7

1.8

3.15

3.4

79.0

10620

9680

70

8.0

16

3.3

70

6120

4730

7.1

1.8

3.15

3.5

82.5

11840

10440

95

8.0

16

3.4

74

7140

5240

7.5

1.9

3.15

3.6

86.4

13200

11350

120

8.0

16

3.5

77

8080

5710

7.9

2.0

3.15

3.7

89.9

14520

12190

150

8.0

25

3.6

80

9120

6220

8.2

2.0

3.15

3.8

93.6

16070

13280

185

8.0

25

3.7

84

10440

6940

8.6

2.1

3.15

3.9

97.3

17710

14090

240

8.0

25

3.9

91

12620

8010

9.2

2.2

3.15

4.1

103.2

20370

15460

300

8.0

25

4.0

95

14690

8800

9.7

2.3

3.15

4.3

108.2

22980

17210

400

8.0

35

4.3

103

17720

10230

10.3

2.4

3.15

4.5

116.8

27480

19450









 

ELECTRICAL DATA :


 

 

 

Nom. Cross- Section Area

 

 

Unarmored Cables

Aluminium Wire Armoured Cables

 

 

Current Ratings

 

 

D C

Resistance CU / AL

 

 

A C

Resistance CU / AL

 

Short Circuit Rating of Conductor CU / AL

1 sec

 

 

Capaci- tance

 

 

Charging Current

Short Circuit Rating of Copper Wire Screen Per Core 1 sec

Short Circuit Rating of Copper Tape Screen Per Core 1 sec

 

 

Reac- tance

 

 

Induc- tance

 

Ground

 

Duct

 

Air

 

CU

 

AL

 

CU

 

AL

 

CU

 

AL

mm²

µΩ/m

µΩ/m

kA

pF/m

mA/m

kA

kA

µΩ/m

nH/m

A

A

A

35

524/868

668/1113

5.0/3.2

132

0.79

2.6

0.9

140

460

170

135

155

120

180

145

50

387/641

494/822

6.8/4.4

142

0.85

2.6

1.0

134

430

210

160

185

140

225

175

70

268/443

343/568

9.8/6.3

159

0.95

2.6

1.0

127

400

255

195

225

170

275

215

95

193/320

248/410

13.3/8.5

175

1.05

2.6

1.1

121

390

295

230

260

205

330

260

120

153/253

196/325

17.2/11.0

189

1.13

2.6

1.1

117

370

335

260

300

235

380

300

150

124/206

159/265

21.2/13.5

201

1.21

4.3

1.2

113

360

375

290

335

265

430

335

185

99.1/164

128/211

26.6/17.0

217

1.30

4.3

1.2

109

350

420

330

380

300

490

390

240

75.4/125

98/161

34.9/22.3

237

1.42

4.3

1.3

104

330

480

380

430

345

570

460

300

60.1/100

80/130

43.8/28.0

258

1.55

4.3

1.4

101

320

530

425

480

385

650

520

400

47.0/77.8

64/102

57.3/36.6

282

1.69

5.8

1.5

96

290

590

480

520

420

700

570






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