电磁场课程“部分电容”实验装置研发

Development of experimental installation for "Part of Capacity" in Electromagnetic Field course

针对目前"部分电容"实验存在的问题,采用电力工程中真实的电缆,研制开发了多导体系统的"部分电容"实验装置,该装置为平行多导体结构。介绍了电缆的选取原则和实验装置设计的关键。对已开发的装置,进行了实验测量。与传统的实验装置相比,该装置是一种基于实际工程的、结构紧凑,同时适合学生进行开发性实验的装置。

The experiment of measuring the ＂Part of Capacity＂ of a multiple conductor system is of importance in Electromagnetic Field course for undergraduate students to understand the capacity concept. In the past, a wooden cable was used for modeling a three-conductor system, whose merit is that students can observe the geometry structure of the conductor system clearly. Apparently, the wooden cable is the simplified physical model and it is hard to establish a bridge between the engineering and the field model. Meanwhile, because the conductor shape is anomalous, the difficulties exist for students to compute the capacity analytically. In order to overcome the disadvantage mentioned before, a cable system, which is widely utilized in practical engineering, is chosen to construct a platform for modeling the capacity of the multi-conductor system. This article presents the principle of selecting cable selection and the key technique for this new installation.