Cables :
  110KV & 220KV XLPE insulated power cable


Standard of product

The 110KV XLPE Insulated power cable is produced according to the standard GB 11017 [Copper and Aluminum conductor extruded XLPE insulated power cables with rated voltage 110KV], which are equivalent to IEC 840 [Test for power cables with extruded insulation for rated voltage above 30kv (Un=36kv) up to 150kv (um=170kv)]. AEIC CS7 [Specifications for cross linked polyethylene insulated shielded power cable rated 69 through 138kv]. The 220kv XLPE cable to standard Q/ZL 81-1996 "Extruded XLPE insulated power cable with rated voltage 200kv" which is equivalent to SS 424 14 17 [Power cables-XLPE-insulated cables with extruded over sheath and rated voltage 12~420kv-testing], and some extension with reference to IEC 840 and AEI CS7

Environment and characteristics for use of the cable.

 
   : Environment for use of the cable is listed in the following table

Type Description Application
Cu Core Al Core
YJV YJLV XLPE insulated, PVC sheathed power cable. For laying in tunnel or duct, unable to bear pulling force or pressure
YJY YJLY XLPE insulated, PE sheathed power cable. Ditto, and has a better property of damp proof
YJLW02 YJLLW02 XLPE insulated corrugated aluminum sheathed PVC over sheath power cable. For laying in tunnel or duct, used in damp environment or the place where water level is comparatively high, and able to bear moderate pressure.
YJLW03 YJLLW03 XLPE insulated, corrugated aluminum sheathed, water proof layer and PE over sheathed power cable.
YJQ02 YJLQ02 XLPE insulated lead sheathed, PVC over sheathed power cable. Ditto, unable to bear pressure.
YJQ03 YJLQ03 XLPE insulated, lead sheathed and PE over sheathed power cable
YJQ41 YJLQ41 XLPE insulated lead sheathed, steel-wire-armored power cable with over fibrous sernings For laying in water, and able to bear moderate pulling force.


    : Characteristics for use.
  • Long-term operating temperature for cable conductor is 90
  • The highest temperature of the conductor in short circuit (no longer than 5 seconds) is not more than 250. If a joint is in the cable. the temperature of the tinning welding joint is not more than 120, compressing joint not more than 150 and electro-welding or gas-welding joint not more than 250
  • No drop is limited provided there is full mechanical tension when cable is laid. It is forbidden to lay cable in iron-pipe or to fix cable by circle around the cable with iron materials.
  • Being laid, the minimum temperature of the cable shall not be lower than 0. In the case if lower temperature, heating measures shall be taken.

Description if size and structure

 
   : Size is in the following table.

Type Rated Voltage Nominal Cross-section
YJV    YJLV 110 240  300  400  500  630  800  1000

1200  1400  1600  1800  2000

YJY    YJLY
YJLW02    YJLLW02
YJLW03    YJLLW03 220
YJQ02    YJLQ02
YJQ03    YJLQ03
YJQ41    YJLQ41


    : Description if the cable construction
  • If nominal cross-section is in the range if 800 and below, the conductor shall be compact circular stranded conductor. In the range of 1000 and above the structure should be compact segmental conductor.
  • Inner screen is formed by super-smooth vulcanizable semiconducting screen materials extruded on the conductor. inner screen is wrapped with semiconducting tape and extruded semiconducting later.
  • Super-clean XLPE insulated materials shall be extruded on the screen of conductor.
  • Outer screen is made up of super-smooth Vulcanizable screen material extruded on the insulation.
  • Products in all type and size have longitudinal water-resistant layers which is made up of semiconducting water-resistant tape wrapped between outer screen and radial water-resistant layer.
  • Metal screen adopts Cu wire winded sparsely or Cutape wrapped. The nominal cross-section area of the wire is 95. Different cross-section area can be designed for various application means.
  • Aluminum-plastic tape or corrugated aluminum sheath or lead sheath can be taken as radial water-resistant later. Corrugated aluminum sheath or lead sheath can be also taken as the metal screen later.
  • Oversheath shall be extruded PVC or PE, the graphite shall be coated on the surface.

The main test Item and technical Performances;

 
   : Electric Performances :

  • Partial Discharge Test
    The sensitivity of partial discharge testing system shall not be more than 5PC. According to the standard in the case of 1.5Uo, the partial discharges shall not be more than 5PC
  • A.C. Voltage-withstand test
  • For Voltage-withstand test done in drums if cable, 2.5Uo A.C voltage shall be applied between the conductor and the conductor and the metal screen, lasting 30minutes, insulation without break down.
  • Messurement of tg
    Heat the conductor of the sample to the temperature in scope of 5 to 10 above permissible operating temperature. Under the voltage of Uo, the tg value shall not be more than 10X10-4.
  • Electric capacity Test
    Measuring the electric capacity between conductor and metal screen, the difference between the actual value and the design value shall not be more than 8% of the design value, Electric capacity design value is attached.
  • Impulse voltage test and the A.C voltage test after the impulse voltage test.
    The impulse voltage test shall performed on the cable at a conductor temperature which shall be less than 5 and not greater 10 above the maximum operating temperature. The cable shall withstand without failure to positive and 10 negative voltage impulses. The impulse voltage values is 550Kv for 110Kv XLPE cable or 1050Kv for 200Kv XLPE cable. After the impulse voltage test, the cable shall be subjected at ambient temperature to power frequently voltage at 2.5 Uo for 15 minutes, not breakdown of the insulation shall occur.

Physical Performances

 
   : Physical and mechanical properties if insulation and over sheath are listed in the following table :

NO Test Item Insulation PVC Sheath PE
1 Hot set test
max, elongation under load 175
max, permanent elongation after cooling % 15
2 mechanical properties without ageing
Min. tensile strength Mpa 12.5 12.5 10.0
Min. elongation at break % 200 150 300
3 mechanical properties after ageing
Tensile strength variation % +25 +25 -
Elongation at break variation % +25 +25 -
4 Pressure test at high temperature
maximum depth of indentation % 50
5 Test for resistance to cracking No crack
  • Voids in insulation
    According to the relevant standards, the size of voids in the insulation shall not be more than 76, The number of voids whose size is more than 51, but less than or equal to 76 shall not be more than 18per 10, In fact, the size if voids can be controlled below 10
  • Insulation thickness
    The average of insulation thickness can not be less than nominal, the thinnest thickness can not be less than 90% of the nominal value. The maximal thickness (Tmax) and minimal thickness (Tmax) measured in the same section shall conform with the following formula: (Tmax-Tmin)/Tmax8%

    

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