Proposal of estimation method of lightning current parameters for protection design of power distribution line based on measurement of EM-field

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06216
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Shizuoka University
• Principal Investigator: Michishita Koji 静岡大学, 工学部, 教授 (50239274)
• Research Collaborator: Yokoyama Shigeru
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 雷放電 / 配電線 / 雷害対策 / 雷パラメータ / 避雷器 / スパークオーバ

Outline of Final Research Achievements

A estimation method of lightning current parameters for protection design of power distribution line based on measurement of EM-field is proposed. In the method lightning current parameters, namely current peak is estimated based on the measured E-field obtained by a fast antenna, and the charge transfer is estimated based on the measured E-field obtained by a slow antenna. The outage rate of a power distribution line estimated by using the estimated parameters is several times as high as the actual rate while the estimated result by the conventional method is an order higher than the actual rate.

Free Research Field

高電圧工学

Academic Significance and Societal Importance of the Research Achievements

雷の電気的な性質を解明する手法を提案した。得られた成果を用いて配電線の事故率評価を行ったところ，現実の被害が従来法よりも精度よく予測できることが分かった。この手法を用いれば配電線の雷害対策の効果を比較的簡単に評価できる。
現在は非常に強固な雷害対策が施されているため停電は殆どなくなっているが，コスト削減のために雷害対策を低減する際にもこの手法を用いて検討する事で，事故率の大幅な増加を防ぐことができると考えている。