報告書番号

T99022

タイトル（和文）

補助ループ導体による低周波磁界抑制方策（２） -アクティブループ方策の要件と導体の弛みの考慮-

タイトル（英文）

ELF magnetic field mitigation near electric power lines using auxiliary conductor loop (part 2): Requirements for active loop shielding and consideration of conductor sag

概要 （図表や脚注は「報告書全文」に掲載しております）

商用周波帯を含む低周波磁界の環境影響研究に関連し，架空電力線の形態の磁界発生源に対し，線路近傍に補助ループ導体を設置し，磁界を打ち消す電流を得る手法について検討を行った．本報告では，補助ループ導体へ強制的に電流を注入し磁界低減を行う，アクティブループ方策についての要件を明確化と導体の弛みを考慮した評価手法を確立することを目的とし，以下の成果を得た．１）電流モーメントの考え方を用い，アクティブループ方策における補助ループ導体への注入電流の最適条件を得る手法を確立した．２）適切なアクティブループ方策により，電力線周辺磁界の距離減衰の次数を上げる効果を明らかにした．３）導体の弛みを考慮した場合について，パッシブループ方策およびアクティブループ方策の磁界低減効果の評価を行い，直線近似による評価を行えば十分であることを明らかにした．

概要 （英文）

Magnetic field mitigation for overhead power lines using passive and active loop conductors was studied. The aim of this study was to clarify the requirements for effective mitigation not in a specific region, such as at the edge of the ROW (right of way), but everywhere around the conductors. For this purpose, the concept of a current dipole moment was introduced. First, to determine the validity of the formula used to estimate the induced current in a passive loop, an experiment involving a miniature transmission line model was performed. Then, the mitigation effectiveness of several overhead transmission line arrangements with different dimensions was estimated by calculation. The application of a current dipole moment was sufficient for explaining the differences in the mitigation effectiveness depending on the conductor arrangement and to clarify the requirements for effective mitigation. Next, we applied this method to determine the optimal current injection in the case of active loop shielding. The effect of the conductor sag was also investigated for both passive and active loop shielding. Advantages and disadvantages of the two shielding methods are summarized in this paper.

報告者

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