Testing the interception efficiency of lightning systems (Initial leader attachment test)

In this high-voltage test, the lightning system is subjected to an electrical field corresponding to the one that occurs immediately before lightning strikes the structure (the blade, the nacelle, etc.). During the test, visible streamers and flashovers will develop, which should all ideally start at the intended parts of the lightning system (air termination points, receptors, etc.) that are designed to withstand being struck directly by lightning.

The test involves having the structure attacked from various angles, and all strikes are documented through photography of the striking point. This verifies whether it is only the intended striking points that are exposed by the electrical field during the lightning strike.

The striking point test is performed in accordance with the latest version of IEC 61400-24, Annex D.2.2 and documented in the form of a test report featuring photos and test results.

The test will exhibit lightning impulse voltages of up to 2-3,000 kV, allowing the generation of flashovers measuring more than 2 m. The test facility can accommodate large test objects such as full size blades and nacelles.

For even larger test objects, the test equipment can be mobilised and moved to a test location with a larger capacity.

Read about tests of subsequent striking points

Contact us to find out more about testing the capture efficiency of lightning systems.

 

 

 

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