Lightning protection


    Operating voltageFrom 30 kV to 40 kV
    Protection typeAgainst direct & indirect lightning
    Installation3 products per pole
    Choose file
    Preview ris.3
    Preview ris.5
    Preview ris.11 1

    SAdM35z is intended to ensure protection of:

    • Recloser and Load Break Switches

    • Medium- and Low-Voltage Transformer

    • Underground Cables

    • Conductor and Insulator against direct and indirect lightning strikes, installed on Section- and Termination Poles.

    The SAdM35z installed in association with Metal-Oxide-Arrester provides the best possible protection for high and medium voltage substations.

    1. Upper “ring” with EQ system

    2. Upper electrode

    3. Air gap

    4. Lower “ring” with EQ system

    5. Lower electrode with indicator

    6. Attachment point

    Operational Principle

    The Operational Principle is based on the EasyQuench Technology.

    The SAdM35z is composed of two discharge components and special attachment points for their mounting on overhead line fittings.

    The variable length of electrodes makes the SAdM35z adaptable to any type of insulator.

    Overall Dimensions

    Upper ring / Lower ring

    Medium sadm35z 2

    Performance specification and characteristics

    SAdM35z and the line
    Highest voltage for equipment

    up to 40.5 kV

    Maximum prospective fault current*, kA 5
    Rated frequency, Hz 50 (±12)
    Power frequency withstand voltage (for minimal 140 mm air gap), kV
    SAdM35z 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 3.5
    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 + jumper

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

    ** According to IEC 60099-8;

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


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

    LLPD SAdM35z must be installed with an air gap between upper and lower electrodes. In order to select the proper value of the gap, please refer to the table.

    Insulator’s CFO (kV) SAdM35z: Air gap (mm)
    <180 Contact us
    180 120
    200 140
    220 160
    240 180
    260 200

    Test Certificates

    Type of Test
    Standard Lightning Impulse Sparkover Test STREAMER
    Follow Current interrupting test STREAMER
    Vibration Test STREAMER
    Functioning Test STREAMER