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
　

• 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.
　

1200  1400  1600  1800  2000

• 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 tgδ
  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 tgδ 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 :
　

• 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)/Tmax≤8%