The paper presents measurements and computational results of the impulse current distribution in lightning protection system (LPS) obtained based on a circuit approach and a frequency-domain full-wave approach. There is a good agreement between computed and measured currents at the test site using the mobile impulse current generator and small residential structure. Small differences in the current waveshapes result mainly from the adopted mathematical approximation which does not perfectly match the current waveshape injected from the generator. Streszczenie. W artykule zaprezentowano wyniki pomiarów i obliczeń rozpływu prądu udarowego w instalacji odgromowej budynku. Obliczenia wykonano dla modeli obwodowego i polowego. Otrzymano dobrą zgodność wyników obliczeniowymi z pomiarami. Małe różnice w kształtach prądów wynikają głównie z przyjętej do obliczeń matematycznej aproksymacji prądu udarowego, która nie odwzorowuje dokładnie prądu z generatora. (Pomiary i modelowanie zaburzeń elektromagnetycznych w instalacji odgromowej budynku mieszkalnego).
Abstract:The distribution of lightning current in the lightning protection system (LPS) and the electrical circuit of two test structures simulating residential buildings was experimentally studied at two research facilities in Florida and in Poland. In Florida, the experiments were conducted using rocket-triggered lightning, and in Poland a mobile current surge generator was employed. The soil in Florida was sandy, while in Poland it was mostly clay. Simulations of lightning current in the LPS and the electrical circuit of each of the test structures were also performed. In this paper, we present results of experiments and numerical modeling of lightning current distribution in different configurations of LPS installed on the test structures at the two sites.
Investigations were conducted aimed on examination of frequency characteristics of middle to low voltage distribution transformer used to supply residential buildings. Two methods were used for the investigations. First, the impedances (absolute values and angles) of transformer middle and low voltage windings were measured and registered using precision LCR meter for frequency range from 20 Hz to 10 MHz. These impedance characteristics were also examined using voltage surge generator and digital oscilloscope. Registered voltage and current waveforms were denoised and transformed to frequency domain. Apart from investigation of distribution transformer the frequency characteristic of input impedances of typical household electrical appliances were examined using the LCR meter. The conducted measurements are significant part of investigations concerning the lightning and overvoltage protection of residential buildings, which are conducted at the test site belonging to Rzeszow University of Technology.
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