Generalized Collin principle of an isolated conductor and multi-conductor systems
孤立导体和多导体系统的广义Collin原则

The Collin principle has been used to estimate the upper bound and lower bound of practical capacitance,which gave out many simple and applicable results.The principle is generalized to the three-dimensional isolated and multi-conductor systems in this paper.Some applicable examples are given by using the approximate method of equal surface area.