This paper by comparing the technical characteristics of the novel capacitor protection with the existing relay protection

this article brings forward inevitability of the technical progress by discuss the novel protection and necessary of development from low-end technology to intelligent technology.Through in-depth study form and setting of a new protective

provides four protection type with corresponding mode in capacitor group basic connection : protection of the single star phase capacitance

protection of the single star section capacitor（series section number of two or more）

protection of the double star connection arm capacitor and protection of the single star bridge differentia arm capacitor

provide principle of protect setting with idea of the failure criterion by allowable value of the change rate of the capacitance. Provide the protection setting formula is convenient and practical

shall meets the engineering requirement for safety and reliability.