一、引言电绝缘工程材料往往是绝热的,这对许多用电系统十分不利。这种材料耗散由电产生的热量非常缓慢,导致热量积累。为保持与环境的热平衡,必须提高排出温度(rej-ection temperature),这会使系统的寿命和可靠性下降。至于现代化的电系统,如印制线路板、发电机线圈等,耗散的能量量 I. INTRODUCTION Electrical insulating engineering materials are often adiabatic, which is detrimental to many power systems. This material dissipates the heat generated by the electricity very slowly, resulting in the accumulation of heat. In order to maintain a thermal balance with the environment, the rej ection temperature must be increased, which leads to a reduction in the life and reliability of the system. As for modern electrical systems, such as printed circuit boards, generator coils, etc., the amount of energy dissipated