110kv 220kv Ehv Super High Voltage Power Cable

110kV 220kV EHV Super High Voltage Power Cable

Executive standards
Cross-linked PE insulated power cables for rated voltage 110kV should perform the rules of Cross-linked PE Insulated Power Cable for Rated Voltage 110kV and its Attachments in GB/T 11017, which is equal to The Test Methods and Requirements of Extruded Insulation Power Cables for Voltage 30kV up to 150kV in IEC 60840.

Cross-linked PE insulated power cables for rated voltage 220kV should perform the rules of Cross-linked PE Insulated Power Cable for Rated Voltage 220kV and its Attachments in GB/T 18890, which is equal to The Test Methods and Requirements of Extruded Insulation Power Cables for Voltage 150kV up to 500kV and its Attachments in IEC 62067.

Cross-linked PE insulated power cables for rated voltage 500kV should perform the rules of Cross-linked PE Insulated Power Cable for Rated Voltage 500kV and its Attachments in GB/T 22078, which is equal to The Test Methods and Requirements of Extruded Insulation Power Cables for Voltage 150kV up to 500kV and its Attachments in IEC 62067.

Cross-linked PE insulated power cables for rated voltage 66kV should perform The Test Methods and Requirements of Extruded Insulation Power Cables for Voltage 30kV up to 150kV in IEC 60840.

Cross-linked PE insulated power cables for rated voltage 33kV should perform the rules of Cross-linked PE Insulated Power Cable for Rated Voltage 33kV and its Attachments in GB/T 12706, which is equal to The Test Methods and Requirements of Extruded Insulation Power Cables for Voltage 6kV up to 30kV in IEC 60502.
Main performance

1. The rated voltage U_o/U of cables: 18/30kV, max. Voltage Um=33kV;

                                38/66 or 48/66kV, max. Voltage Um=72.5kV;
                                64/110kV, max. Voltage Um=126kV;
                                76/132kV, max. Voltage Um=145kV;
                                127/220kV, max. Voltage Um=252kV;
                                290/500kV, max. Voltage Um=550kV.

1. Permissible long-term working temperature of cable conductor 90ºC.

When the cable confronts short circuit within 5 seconds, the highest temperature of the conductor should not exceed 250ºC. When there exit line joints, the temperature of tin soldering ones should not exceed 120ºC, the temperature of crimping ones should not exceed 150ºC, and

1. the temperature of electric or gas welding should not exceed 250ºC.
2. When laying, the max. permissible bending radios should exceed 25D; After laying, the max. Permissible bending radios should exceed 23D.
3. When laying, ambient temperature ≥0ºC (When the cable has to be laid under the ambient temperature below 0ºC, it is necessary to preheat the cable above 0ºC)
4. When laying, the cable isn’t limited by disparity with the satisfaction of mechanical pressure, but it is not permissible to lay the cable in the iron pipe, nor the circular iron materials around fixed cables.

Note: 1. The table only lists the main types. According to the requirements of clients, the types of flame resistance, rat proof, and termite proof and son on, can also be produced, then the prefix of "ZC, WZDZB, FS, FY" should be added.

    2. The expressions of product symbols

    Cross-linked PE insulation – YJ            Copper conductor – T

    Aluminum conductor – L                  Winding copper wire shield – S

    Al-plastic composites – A      Lead set – Q

    Corrugated aluminum jack – LW      PVC outer sheath – V or 02

    PE outer sheath – Y or 03                  Vertical blocking structure – Z
 
    Rat proof – FS              Termite proof – FY

    Flame resistance A, B, C – ZA, ZB, ZC

    Low smoke, zero halogen, fire resistant – WDZA, WDZB, WDZC

Product range
 

Note: The aluminum conductor is not recommended concerning to cables for voltage exceeding 220kV.

Cable Construction
 

1. The property of cable conductor is in accordance with the rules of GB/T 3956-2008. The cross-section below 800mm² should be tight round winding conductor; above 1000mm² should be segmentation conductor construction.

1. Inner shield adopt the cross-linked semi-conductive shield materials to extrude over the conduct extremely smoothly.

1. Insulation should adopt the extremely clean XLPE insulation materials, and triple extrude with outer shield tightly bonded.

1. Outer shield should adopt cross-linked shield materials o extrude over insulation extremely smooth.

1. Vertical water blocking layer and buffer layer should adopt semi-conductive water-proof tapes with strong capacity of water-proof to wrap between the outer shields and vertical water-proof layer.

1. Vertical water-proof layer should adopt the al-plastic composites and iron jack should adopt corrugated aluminum or lead sheath, which can meet the capacity and screen of short circuit.

1. Protection layer and corrosion resistance layer make sure the effective protection for the corrugated aluminum jack or lead sheath.

9. Outer jack should adopt PVC, PE or other relative sheath materials to extrude, in order to meet the electrical function and mechanical function. Other types of cables such as flame resistance, rat proof, low smoke and halogen also are produce as the different requirements of different places. The surface of outer sheath coasts or extrudes with a layer of continuously smooth semi-conductive materials as the pressure-resistant electrode of outer sheath.