An innovative method, namely the current integration method or $Q(t)$ method, for evaluating the electrical insulating properties of insulating material was introduced in the “News from Japan” column of the July-August 2021 issue of the IEEE Electrical Insulation Magazine [1]. In this issue, several examples of the application of the $Q(t)$ method to industrially important phenomena such as the effects of gamma-ray irradiation and the appearance of water trees in cables are introduced. In addition, examples of its application to actual devices such as power electronic devices (IGBTs, insulated-gate bipolar transistors) and stranded insulated wires are mentioned.

中文翻译：

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日本新闻

一种创新方法，即当前的集成方法或 $Q(t)$IEEE 电气绝缘杂志 2021 年 7 月至 8 月号的“日本新闻”专栏中介绍了评估绝缘材料电绝缘性能的方法[1]。在本期中，几个应用实例$Q(t)$介绍了工业上重要现象的方法，例如伽马射线辐射的影响和电缆中水树的出现。此外，还列举了在电力电子设备（IGBT、绝缘栅双极晶体管）、绞合绝缘线等实际设备中的应用实例。