Keywords
electrical installation
surge current distribution
measurements and simulations
Abstract
The paper presents results of the lightning protection system (LPS) tests for a small residential structure with the connected home appliances and electronics, conducted in 2013 at the new test site in Poland using the mobile surge current generator. Current surges were injected from generator to the air termination on the building roof. Current distribution in individual elements of test object was measured and registered with multi-channel electro-optical measurement system. The current waveshapes in the vertical ground electrodes differed from the injected current waveshapes and from the current waveshapes in other parts of the test system. Computer simulation using ATP-EMTP were carried out in order to verify the results of measurements. Vertical and horizontal ground electrodes were modeled for specified parameter resulting from the geometrical configuration of the system and the measured soil conductivity. Conducted investigations showed the significant influence of configuration, dimensions and impedance of test object on current distribution. A significant influence of frequency dependent components of the system impedances on current waveshapes has been noticed. Computed results show a good agreement with the experimental data. Small differences in the current waveshapes result mainly from the adopted double-exponential mathematical approximation which does not perfectly match the current injected from the generator.
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