Study on current reduction via ground into power generation systems near coast by controlling lightning surges due to high pressure gas phase

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To reduce the lightning current via the ground into power generation systems near the coast, the impulse discharge experiments have been performed using the building material gap soaked by a simulated sea under high-pressure dry-air conditions. The results are as follows; (1) in the case of mortar gap soaked by a simulated sea, using the KCl water solution, the discharge waveforms has unipolar ones and the discharge threshold voltage is reduced to 33 % compared with the dry gap, (2) in the case of concrete gap soaked by a simulated sea in dry-air within 5 atm, the discharge emission pattern widely expands on the concrete surface and the peak current amplitudes are also reduced to 47 % compared with the dry gap, where this means that discharge resistance in a concrete volume increases with increasing air pressures, and (3) it is considered that an application of the concerned study is available against lightning current invasion in the region surround a grounding system.