Lightning protection

SAdC20z

Maximum operating voltage24 kV
Protection typeAgainst direct & indirect lightning
Installation3 products per pole
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Preview sadc20z
Preview sadc20z

SAdC20z is intended for protection of overhead lines with the highest voltage for equipment up to 24 kV against direct lighting strikes, induced overvoltages and their deleterious consequences.

Field of applications includes protection of:

  • Conductors and insulators on intermediate, section and termination poles
  • Recloser and load break switches*;
  • Medium and low voltage transformers*;
  • Underground cables*;
  • Pole mounted transformers*;
  • High and medium voltage substations*

  • * for such application SAdC20z is supposed to be installed jointly with conventional Metal-Oxide Surge Arresters for ensuring highest degree of protection.

    Overall Dimensions

    Medium sadc20z 2

    Performance specification and characteristics

    SAdC20z and the line
    Highest voltage for equipment

    up to 24 kV for:

    • 3W systems with insulated, compensated neutral.

    up to 21 kV for:

    • 3W and 4W systems with solidly grounded neutral;
    • Lines with overhead shielding/ground wire.
    Maximum prospective fault current*, kA 5
    Rated frequency, Hz 50 (±12)
    Power frequency withstand voltage (for minimal 140 mm air gap), kV
    30
    SAdC20z and lightning
    High current impulse (4/10 μs), kA 65
    Lightning discharge capability** (200 μs), C 2.4
    Maximum fault quenching lightning current (8/50 μs), kA 20
    Minimum withstand amount of operations 10
    Additional power losses on the line, % 0
    Weight, kg 2.5
    Average life time expectancy, years 20 to 30
    UV resistance***, h 1000
    Time to install/pole, min. 10 to 20
    Maintenance 1 visual verification per year
    Additional Equipment cross-arm fitting and conductor clamp (glass indicator as an option)

    * Maximum calculated short-circuit current in LLPD’s location;

    ** According to IEC 60099-8;

    ** According to ISO 4892-2, method A, IEC 62217.

    Installation

    1 piece per phase for each circuit on one pole for ensuring comprehensive protection of an overhead line against DLS, BFO and IOV.

    LLPD SAdC20z must be installed with an air gap between upper and lower electrodes. In order to select the proper value of the gap, please address to the table.

    Insulator’s CFO (kV)

    SAdC20z: Air gap (mm)

    <120

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    120

    40

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    140

    45

    60

    160

    55

    60

    180

    65

    75

    200

    80

    90

    Medium sadc20z 3

    Test Certificates

    Type of Test
    Laboratory
    Standard lightning impulse sparkover test
    STREAMER
    Follow current interrupting test
    STREAMER
    Vibration Test STREAMER