Control of Electric Field at Polarity Reversal in DC Vacuum Electric Apparatus

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630110
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Nagoya University
• Principal Investigator: KOJIMA Hiroki 名古屋大学, 工学研究科, 准教授 (00377772)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 電気機器工学 / 真空電気絶縁 / 直流機器 / 極性反転 / 帯電 / 電荷挙動

Outline of Final Research Achievements

For extending of the range of the application of vacuum insulating electric apparatus, e.g. vacuum circuit breakers, we have to consider the effect of change of charging distribution at the polarity reversal of dc voltage. In this study, we focused on the charging phenomena on the dielectric surface in vacuum, and investigated the charge behavior on the dielectric surface at the polarity reversal.
From the temporal evolutions of charging potential and light emission, at the polarity reversal of dc voltage, it was revealed that the charge neutralization without flashover occurred with the time constant of a few ms to a dozen ms, which is relatively slow.

Free Research Field

電気機器