Early Warning of Lightning Strokes to Power Apparatus Viewed from Time Transition of Electric Field Distribution on the Ground under Thundercloud

从雷云下地面电场分布时间演变看电力设备雷击预警

• 批准号: 62550200
• 负责人: KITO Yukio
• 金额: $ 1.22万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550200/
• 关键词: Lightning discharge; Summer lightning discharge; Winter lightning discharge; Point discharge current; Space-electric-field meter; Ground flash; Regional distribution of electric field; Early warning of lightning strokes; 雷撃予測; 対地雷放電

Obtained results in this project are summarized as the following seven items ; 1. Simultaneous observation of the electric field intensity on the ground have been performed at several sites inside Kahoku-gata, a reclaimed land located in the northern suburbs of Kanazawa in winter, and Kisozaki, a reclaimed land in the western suburbs of Nagoya in summer. 2. A graphical method was developed to presume regional distribution of the electric field under the winter thundercloud on the basis of observed records. 3. Large pulsive components found on recorded waveforms of the point discharge current were identified as the large electric field change associated with lightning discharges. 4. The regional distribution of the electric field on the ground were stored in our data-base with respect to 61 natural lightnings in winter around Kahoku-gata. A number of natural lightning discharges with different polarities may occur when more than 30% of the total area of Kahoku-gata is occupied by the negative intensity of the electric field. 5. The accurate stroke locations were determined by the double-quarter VTR observations with respect to eleven cloud-to-ground natural flashes. These have struck positions within distance of about 1 km from the boundary between the positive and the negative areas of the electric field on the ground. 6. The summer lightning discharge around Nagoya only occurs in the afternoon, but the.winter one around Kanazawa occurs in day and night. 7. According to the records obtained by a developed battery-saving type Space-electric-field meter, order of a few nC/m^3 is produced around ground under the strong thundercloud in winter and it changes with a certain time lag with increasing or decreasing of the electric field on the ground. The space electric field close to the top of a vertical rod electrode, 10m high, is reduced to about half compared with that of the same height.

该项目中获得的结果总结为以下七个项目； 1。在冬季，位于卡纳泽北部郊区的回收土地上，在Kahoku-Gata内的多个地点进行了对地面上的电场强度的观察，而Kisozaki则是夏季Nagoya西部郊区的回收土地。 2。开发了一种图形方法，以根据观察到的记录来假设冬季雷云下电场的区域分布。 3。在记录的点放电电流的记录波形上发现的大脉冲成分被确定为与雷电放电相关的大电场变化。 4。地面上电场的区域分布存储在我们的数据库中，相对于冬季Kahoku-Gata周围的61个自然发光。当kahoku-gata总面积的30％以上被电场的负强度所占据时，可能会发生许多具有不同极性的自然避雷出。 5。准确的中风位置是通过双季度VTR观测来确定的，相对于11个云到地面的自然闪光。这些位置在地面上电场的正和负区域之间的边界约1公里内撞击了位置。 6.名古屋周围的夏季闪电排放仅在下午发生，但是白天和黑泽周围的冬季发生在白天和黑夜。 7。根据发达的电池式空间电场仪表所获得的记录，冬季在强雷云下面的地面下在地面周围产生了几个nc/m^3的顺序，并且随着一定时间滞后的变化，地面上电场的增加或减少。与相同高度相比，靠近10m高的垂直杆电极顶部的空间电场降低到一半。

项目成果

櫻野仁志、堀井憲爾: RESEARCH LETTERS ON ATMOSPHERIC ELECTRICITY. 8. (1989)

Hitoshi Sakurano，Kenji Horii：大气电研究快报 8。（1989）。

鬼頭幸生,五十住晋一,才田敏之,櫻野仁志: "避雷針保護角内の電界強度低減に関する実験的検討" 電気学会放電・高電圧合同研究会資料(ED-89-136,HV-89-79). 39-46 (1989)

Yukio Kito、Shinichi Isozumi、Toshiyuki Saita、Hitoshi Sakurano：“避雷针保护角内电场强度降低的实验研究”IEEJ 放电和高电压联合研究组材料（ED-89-136、HV-89-79）。 39-46 (1989)

才田敏之,鬼頭幸生,櫻野仁志: "日本海側冬季雷雲下における地上電界と地上高5mの空間電界との相関性" 平成元年度電気関係学会東海支部連合大会講演論文集. 84 (1989)

Toshiyuki Saita、Yukio Kito、Hitoshi Sakurano：“日本海一侧冬季雷云下的地面电场与距地面 5 m 高度的空间电场的相关性”1989 年东海分会会议论文集电气工程协会。84（1989）

才田敏之: "日本海側冬季雷の2方向同時観測による雷撃地点の光学的同定" 平成2年電気学会全国大会講演論文集. (1990)

Toshiyuki Saita：“通过同时观测日本海一侧两个方向的冬季闪电来光学识别雷击点”，1990 年日本电气工程师学会全国会议论文集（1990 年）。

鬼頭幸生: "昭和62年度梅雨末期における針端コロナ電流の多地点観測" 昭和62年度電気関係学会東海支部連合大会講演論文集. 72 (1987)

鬼头幸雄：《1985年雨季末期针尖电晕电流的多点观测》1985年电气工程学会东海分会会议论文集72（1987）。