XLPE INSULATED POWER CABLE

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Product Description:

It applices to the transmission and distribution lines with rated voltage from 0.6/1 kilovolts to 26/35 kilovolts , while flame retardant power cable is used in theplaces with special demands of flame retardant property , where cable is laid tightly


Table of rated voltage for 3 phase cable

U

Um

Uo


class 1


class 2

1

3

6

10

15

20

35

1.2

3.6

7.2

12

17.5

24

42

0.6

1.8

3.6

6

8.7

12

21

0.6

3.6

6

8.7

12

18

26

  class 1 applies to system of the duration of syngle phase earthing fault normally less than 1 minutes each time or the system of maximum duration less than 8 hours each time, but the total duration not more than 125 hour.

  class 2 applies to system of more duration of earthing fault or the system with higher requirement to property of insulation.

Standards

  The products are produced in accordance with GB/T12706-2002, i.e. , Copper or Aluminium Conductor Plastic Insulated Power Cable with Rated Voltage UP to and Including 35 kilovolts,part 3-XLPE Insulated power Cable.

4Characteristics

 -maximum rated temperature of conductor is 90℃

 -maximum temperature is 250℃ when cable is shorted for less than 5 seconds

 -ambient temperature should be not lower than 0℃ when cable is installed

 -minimum bending radius is as follows when cable is installed

五 Key Technical Property(for type test)



Rated voltage,unit:KV


3.6/6

(7.2)


6/6

6/10


8.7/10

8.7/15


12/20


18/20

18/30


21/35


26/35


ConductorD.C.resistanceunit:Ω /km


see the following table



Partial discharge test at1.73time U o ,unit:pC


< 5


Partial discharge test at1.73time U o afterbending test,unit:pC


< 5


pC Partial discharge test at1.73time U o after heat cycle test,unit:pC
Partial discharge test at1.73time U o ,unit:pC




< 5


4hours A.C.volatage test,not break down,unit:kV


14.4


24


34.8


48


72


84


104


Pulse voltage test,unit:kV


60


75


95


125


170


200


15minuses power frequency voltage
withstanding test,unit:kV


12.5


21


30.5


42


63


53


65



Rated voltage, unit: kV

3.6/6

(7.2)

6/6

6/10

8.7/10

8.7/15

12/20

18/20

18/30

21/35

26/35

XLPE hot set test

Test condition:15min., 20N/cm2

Max. elongation under load

Max. elongation after cooling,no load





175



15

Min. tg δ at AC 2kV and 90±5℃



8×10



10×10

Mechanical and physical property of insulation and sheath


Maximum D.C. resistance at 20 ℃    unit: Ω /km


Cross-sectionmm 2


Copper


Aluminium


Cross-sectionmm 2


Copper


Aluminium


1.5

2.5

4

6

10

16

25

35

50

70


12.1

7.41

4.61

3.08

1.83

1.15

0.727

0.524

0.387

0.268


~

12.1

7.41

4.61

3.08

1.91

1.20

0.969

0.641

0.443


95

120

150

185

240

300

400

500

630

800


0.193

0.153

0.124

0.0991

0.0754

0.0601

0.0470

0.0366

0.0283

0.0221


0.320

0.253

0.206

0.164

0.125

0.100

0.0778

0.0605

0.0469

0.0367

6Calculation Condition of Ampacity

 -ambient temperature is 25℃ (underground) , 40℃ (air).

 -conductor working temperature is 90℃

 -soil heat resistance coefficient is 1.0℃·m/W , but not consider its rise resulted from water migration when it operates continuously.

 -gap between axis of cable and surface of ground is 700 millimeter when it is laid in earth

  -for many cable being laid in parallel. gap of axis of cables is 2 ti

7Factor of Affecting Ampacity of Cable

 1 Ampacity coefficient when many group of cable are laid

Coefficent when cable is laid horizontally,directly in earth


Numbers of group


2


3


4


5


6


7


8




Gap


Contacted


0.79


0.69


0.63


0.85


0.55


0.50


0.46


7 cm


0.85


0.75


0.68


0.64


0.60


0.56


0.53


25 cm


0.87


0.87


0.75


0.72


0.69


0.68


0.64


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