外部磁界印加時の短時間アーク電流ノイズ計測

摘要

電気接点の開閉時に発生するアーク放電は電磁ノイズの発生源となるため，EMCは寿命，信頼性などと同様に重要な評価パラメータである．本論文では外部磁界の影響を明らかにするために，磁界印加時の銀接点低速開離1回目の最初に発生する短時間アークに着目し，電流ノイズ計測を行った．アーク継続時間と持続電圧の関係から，30mT印加時には無印加と比べてアーク継続時間が平均l桁，持続電圧が平均1V減少することを明らかにした．また最初の短時間アークの電流ノイズは継続時間が長いほど増加することが明らかとなった．%Since an arc discharge generated by breaking electrical contact is considered as a main source of an undesired electromagnetic (EM) noise, EMC, as well as lifetime and reliability, are important parameters for evaluation of the electrical contact. In order to clarify an effect of DC external magnetic field on current noise of short-time arc, current noise from slowly breaking silver contact with external DC magnetic field is measured and discussed in this paper. Arc duration and short-arc sustainable voltage (SASV) became shorter about one-tenth and smaller about IV with 5=30mT case than that of without external magnetic field case. As duration is longer, current noise in the first short-time arc increases.