最近已研制出采用零序电流方向原理的选择性保护装置,对放射式供电系统可实现漏电支路的选择性切除,但它不能保护电网的对称性漏电故障,纵向选择性靠延时来实现,这是其不足之处。针对上述问题,我们研究出一种称之为“带自动复电的选择性漏电保护系统”。它具有动作速度快、可靠性高、有选择性、保护 Recently, a selective protection device using zero-sequence current direction principle has been developed to selectively cut off the leakage branch of the radial power supply system. However, it can not protect the symmetrical leakage fault of the power grid, and the vertical selectivity depends on the delay , This is its shortcomings. In response to the above problems, we have developed a so-called “selective recharging with leakage protection system.” It has the action speed, high reliability, selectivity, protection