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Cross_linked Polyethylene IN sulated Power cables with voltages up to 35kv
Ò»¡¢ Introduction
For XLPE insulated power cable£¬either chemical method (peroxide or silane cross-linking)or physical method had been employed to transform the molecular structure of PE from linear chain into three-dimensional network£¬so that thermoplastic PE had been changed into thermosetting XLPE£¬After cross-linking£¬The mechanical properties£¬heat-aging properties have been greatly improved while it¡¯s excellent electrical properties are still maintained.
The nominal conductor operating temperature of XLPE insulated power cable is 90¡æ which is higher than of paper¡¢ PVC or insulated power cable¡£The cable has the advantages of simplicity in construction£¬small outer diameter ¡¢lightness in weight¡¢and in ues and good ¡¢it can also be laid with no limitation of level difference at installation.
¶þ¡¢ Standards
The cables is manufactured according to GB12706-2002 or IEC 60502-1997.It is suitable for the power transmission and distribution with rated voltage of (U/Uo)3.6/6-26/35kV
Èý¡¢ Operation characteristic
1.Maximum operating temperature
The maximum operating temperature of conductors shall not exceed 90¡æ.when the cable is used for long period¡£The temperature of short-circuit shall not exceed 250¡æ£¬maximum sustain period not exceed 5 seconds¡£
2.Permissible time for earth fault
UkV
Uo
kV
kV
category A and B
category C
6
3.6
6
10
6
8.7
15
8.7
12
20
12
18
30
18
  
35
21
26
Category A£ºthe earthing-block time does not exceed 1 minule each times.
Category B£ºthe earthing -block time usually does 1 hour each times and not more than 8 hours at most.
Category C£ºthis Category comprises all systems which do not fall into Category A or B.
The cable¡¯s rated voltage for three-phase system is defined in table.
3.The installation of cable is not limited by the difference of level the route. The ambient temperature should not below 0¡æ during installation.
4.The minimum bending radius of cable at installation
Bending radius of single core cable 20(d+D)
Bending radius of multi core cable 15(d+D)
D=actual outer diameter of cable(mm)
d=actual diameter of conductor(mm)
ËÄ¡¢Type¡¢description¡¢Application
Type
description
Application
YJV YJLV
Cu or Al Conductor XLPE insulated PVC sheathed power cable
 For laying indoors£¬in tunnel and in ducts.Able to bear a forces of during laying but not external mechanical forces.
YJY YJLY
Cu or Al Conductor XLPE insulated PE sheathed power cable
  
YJV22
YJLV22
Cu or Al Conductor XLPE insulated PVC sheathed inner steel tape armoured power cable
 For laying indoors£¬in tunnel¡¢in ducts and underground£¬Able to bear external mechanical forces but not pulling large forces¡£Impermissible to used sigle in Ac circuit.
YJV23
YJLV23
Cu or Al Conductor XLPE insulated PE sheathed Inner steel tape armoured power cable
  


Construction:
Main Properties
Test item
Uo/U(kV) Rated Voltage Uo/U(kV)
3.6/6
6/6 6/10
8.7/10 8.7/15
12/20
18/20
18/30
21/35
26/35
conductor resistively test
+20¡æconductor D.c resistively not more than the following table's values
Routine A.C Voltage test (kV)
12.5
21
30.5
42
63
73.5
91
Time(min)
5
5
5
5
5
5
5
Routine partial A.C voltage(kV)
6.2
10.4
15.1
20.8
31.1
36.3
45
Discharge testhot cirded not greater than¡Ü(PC)
10
10
10
10
10
10
10
Sample 4h A.C voltage test (kV)
14.4
24
34.8
48
72
84
104
Partial discharge after bending (kV)
6.2
10.4
15.1
20.8
31.1
36.3
45
Test in temp type test
5
5
5
5
5
5
-
hot cirded ¡Ü(PC)
-
-
-
-
-
-
-
T=Rated temperature¡Ü
-
0.0008
0.0008
0.0008
0.008
0.001
0.001
Temp type test breakdow test (kV)
60
75
95
125
170
200
200
The cable of flame retardant except according to GB12706,The flame retardant property of the flame retardant cable must meet the corresponding demands class A.B.C which in GB12666.5 or IEC332-3.class A is best.The firc retardant property of the fire-resistance cable can he class A and class B.can choose as practical needs.