PMIA (Poly-m-phenylene isophthalamide) is an ideal substitute for traditional cellulose paper in oil-immersed paper insulating scenarios. This paper studies the partial discharge characteristics of oil-immersed laminated PMIA. According to the $\mathrm{q}{-}\varphi$ scatter diagram, discharge quantity and discharge phenomenon, the partial discharge process of PMIA is divided into 3 stages: creeping discharge, co-existence discharge and pre-breakdown. The micro-structure and chemical components of damaged PMIA are presented. The carbon trace, functional groups, carrier trap characteristics and residual insulation strength in different stages of partial discharge are studied. This paper provides a theoretical basis for the application of PMIA in electrical insulation.

中文翻译：

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油浸层压PMIA纸局部放电损伤机理的实验研究

PMIA（聚间苯二甲酰胺）是油浸纸绝缘场景中传统纤维素纸的理想替代品。本文研究了油浸层压PMIA的局部放电特性。根据$\mathrm{q}{-}\varphi$从散点图、放电量和放电现象来看，PMIA的局部放电过程分为沿面放电、共存放电和预击穿3个阶段。介绍了受损PMIA的微观结构和化学成分。研究了局部放电不同阶段的碳痕量、官能团、载流子陷阱特性和残余绝缘强度。该论文为PMIA在电绝缘中的应用提供了理论依据。