Lightning protection


Operating voltageFrom 30 kV to 40 kV
Protection typeAgainst direct & indirect lightning
Installation3 products per pole
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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