静電気放電試験器の気中放電に対する周囲温度と絶対湿度を介した火花長と放電電流ピークの特定関係

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2020/12/01

タイトル(英語): A Specific Relationship between Spark Lengths and Discharge Current Peaks via Ambient Temperature and Absolute Humidity for Air Discharges from Electrostatic Discharge Generator

著者名: 石田　武志（（株）ノイズ研究所），戸澤　幸大（（株）ノイズ研究所），藤原　修（（株）ノイズ研究所／電気通信大学）

著者名(英語): Takeshi Ishida (Noise Laboratory Co., LTD.), Yukihiro Tozawa (Noise Laboratory Co., LTD.), Osamu Fujiwara (Noise Laboratory Co., LTD./The University of Electro-Communications)

キーワード: 静電気放電試験器，気中放電，周囲温度，絶対湿度，放電電流ピーク，火花長　　electrostatic discharge generator，air discharge，ambient temperature，absolute humidity，discharge current peak，spark length

要約(英語): A discharge current waveform for air discharge immunity testing is well-known to be significantly affected by many factors such as approach speeds, ambient temperature (T) and relative humidity (RH), as a matter of fact, it is not widely recognized that an essential affecting factor is the resultant spark length itself. For clarifying the effect of the approach speeds and climatic conditions on air discharge testing, we previously measured air discharge currents from an electrostatic discharge (ESD) generator with test voltages from 2 kV to 15 kV at two different approach speeds of 80 mm/s and 20 mm/s under 6 combinations of T and RH in the IEC specified range and non-specified climatic range. The result showed that at a test voltage of 15 kV under the IEC specified climatic conditions over RH 30%, the 20 mm/s approach speed yields the current waveforms entirely different from those at 80 mm/s despite the same absolute humidity (AH) conditions, and that the peaks are basically unaffected by the AH. Under the IEC non-specified climatic conditions with RH not greater than 20%, however, as in the case of 80 mm/s, the peaks decrease at higher test voltages when the AH increases. In this study, to investigate how the above findings can be derived, we estimate the spark lengths for air discharges of an ESD generator at test voltages from 2 kV to 15 kV from the measured discharge currents under the IEC specified and non-specified climate conditions with respect to two different approach speeds of 80 mm/s and 20 mm/s. As a result, on the same AH conditions, regardless of the approach speeds, the spark lengths under the IEC non-specified conditions (higher temperature or lower relative humidity) are shorter than those under the IEC specified conditions, which yields a higher current peak. A relationship between the spark lengths and the current peaks is deterministically given by a single curve according to the test voltage regardless of the approach speeds and climatic conditions, and the coordinates on the curve change depending on an approach speed, ambient temperature and absolute humidity.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.140 No.12 （2020） 特集：2019年環境電磁工学国際シンポジウム（EMC Sapporo and APEMC 2019）

本誌掲載ページ: 543-548 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/140/12/140_543/_article/-char/ja/