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Cable Sheath Protection

Cable Sheath Protection

Cable sheath protection Picture Show Explanation Large cross-section 35kV power cables and 66kV, 110kV and above voltage level of power cables are single-core cable, one end of the cable metal sheath phase interconnected and grounded and the other end is not grounded, when lightning or internal...

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    Cable sheath protection


    Picture Show

    新建 DOC 文档39.jpg

    Explanation

    Large cross-section 35kV power cables and 66kV, 110kV and above voltage level of power cables are single-core cable, one end of the cable metal sheath phase interconnected and grounded and the other end is not grounded, when lightning or internal over-voltage waves along the cable core flow, the cable metal sheath without ground terminal will appear higher impact overvoltage,short circuit or when the system fault current flows through the cable core, its protective layer does not also appear high groundfrequency induction overvoltage. The over-voltage can penetrate the cable outer sheath insulation, causing the cable metal sheathmulti-point ground fault, seriously affecting the normal operation of power cables or even substantially reduce cable life. Thus the power industry standard DL/T401-1991 "high voltage power cable guide for the selection," states: cable sheath must be used to limit the power cable protection metal shield (or metal sheath) on the induced voltage and over-voltage fault.


    Product Features

    Grounded at one end of the cable company for crossover interconnection lines and cable lines designed silicon rubber cable sheath protector has the following characteristics:
    1, low residual voltage using a large-capacity high-quality ZnO chip with through flow, protection ratio characteristics;
    2, the maximum limit, reducing the metal sheath cable lines in frequency induction over-voltage and over-voltage shocks;
    3, integrally molded silicone rubber jacket, good sealing, anti-fouling ability, light weight, small size, anti-collision, heat resistance, aging, maintenance-free;
    4, such as configuration discharge counter or monitor can automatically and accurately recorded in a variety of over-voltageprotection actions under the number and quality of operation.


    Explanation

    model

    System amount

    Constant voltage

    kV

    Power frequency resistance

    Pressure/

    time

    kV/s

    10kA lightning

    Under current

    ≤kVp

    DC U1mA

    Reference voltage

    ≥kV

    2ms square wave

    Flow capacity

    A

    Under 0.75U1mA

    Leakage current

    ≤μA

    Currently in the market

    Model number marked by country line

    LHQ-6

    6

    1.9/4

    4.6

    2.1

    400

    50

    BHQ、BYL、
    FBY、SHQ、
    BYLS、TBP-D

    LHQ-10

    10

    3.6/4

    8.7

    4.0

    400

    50

    LHQ-35

    35

    5/4

    12

    5.5

    400

    50

    LHQ-110(Ⅰ)

    110

    6/4

    15

    6.5

    400

    50

    LHQ-110(Ⅱ)

    110

    10/4

    25

    11.0

    400

    50

    LHQ-220(Ⅰ)

    220

    6/4

    12

    5.8

    400

    50

    LHQ-220(Ⅱ)

    220

    13.6/4

    31

    15

    400

    50

    LHQ-500

    500

    7.5/4

    8*

    8.3

    400

    50

    *Note: Residual voltage at lightning impulse current of 16kA


    Cable sheath insulation withstand voltage value (DL/T401-1991) "voltage power cable guide for the selection"

    Cable Rated voltage / Rated voltage system
    Ue/U

    1min Frequency withstand voltage
    kV

    Workers lightning impulse withstand voltage
    kVp

    37/63、48/63、64/110

    24

    37.5

    127/220

    24

    47.5

    190/330

    24

    62.5

    290/500

    24

    72.5


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