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

为了减少雷电流通过地面进入海岸附近的发电系统，冲击放电实验已被使用的建筑材料间隙浸泡在高压干燥空气条件下的模拟大海。结果如下：（1）在模拟海水浸泡的砂浆缝隙中，KCl水溶液的放电波形为单极型，放电阈值电压比干缝隙降低了33%;（2）在5atm以内的干空气中模拟海水浸泡的混凝土缝隙中，放电发射图案在混凝土表面上广泛扩展并且峰值电流幅度也与干间隙相比减小到47%，其中这意味着，放电电阻在混凝土体积增加与增加的空气压力，和（3）它被认为是一个应用程序的有关研究是可用的，以防止雷电电流入侵在该地区周围的接地系统。

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.