关键词: 漏电保护, 附加直流, 零序电压, 零序电流, 硬件结构, 软件流程, 抗干扰技术

Abstract:

In view of the low-voltage power grid current environment where there is not adequate feed protection equipment,a new integrated feeder protection is presented with emphasis on the working principle,hardware architecture,software process,and anti-jamming technology of the system.Testing results show that this system both guarantees accurate operation resistance value and selection and improves the reliability and stability of the power supply system and can be applied in practice.

Key words: leakage protection;additional DC;zero-sequence voltage;zero sequence current;hardware structure;software processes;anti-jamming technology