Observation on Lightning Discharge and Correlation of Lightning Damage with Lightning Parameter in Winter at Hokuriku District

项目期间，在石川工业大学（ICT）安装了冬季雷暴观测系统。利用该系统对北陆地区雷电放电特性进行了测量。讨论了高压配电系统雷电损伤与其放电参数的关系。所得结果总结如下：1。点放电电流波形上的脉冲分量与闪电密切相关。通过对这些脉冲进行计数的方法，可以清楚地知道这个地区雷电放电的发生频率。闪电频道是由资讯及通讯科技署的多个摄影机拍摄的。这些图片显示了冬季闪电放电的各种特征，如多次闪电、向上分支通道、沿云底水平传播通道等。根据雷电到达的时间和VTR记录的雷击方向，估计出18个雷击点。这些点被标在地图上。在距离触击点的距离上，测量了在ITC附近扩展的3条馈线上电压和电流的零相序分量。

During the term of thes project,the observation system on winter thunderclonds was installed at ishikawa College of Technology (ICT). Characteristics on lightning discharge at Hokuriku destrict were measured by this system. Correlation of lightning damages on high-voltage distribution systems with its descharge parameter was disccussed. Obtained results are summarized as follows;1. Pulse components on a waveform of the point discharge current was closely related with a lightning flash. By the method of counting these pulses,the frequency of occurence of lightning discharges was made clear in this destrict.2. Lightning channel was taken with sevral video cameras from ICT. These pictures showed various characteristics of winter lightning discharge,for ezample,a multiple flash,an upward branching channel,a hoizontal propagating channel along cloud base.3. Struck points of 18 strokes were estimated from the arriving time of thunder and the direction of stroke recorded on VTR. These points were plotted on a map.4. Zero-phase-sequence components of voltage and current on extraded 3 feeders near ITC were measured the destance from striking point.