Automatic Reclosing Zero Sequence Current Transient Process And Accelerate The Protection Scheme

The paper studies the characters of transient zero sequence current during single-phase recloser and three-phase recloser and it's influence upon several often used algorithm. According to the characters of transient zero sequence current and it's magnitude, a self-adapting accelerating scheme for zero sequence current protection during single-phase and three-phase recloser is presented which overcomes the shortcoming in general schemes which needs delaying. In allusion to the characters of system oscillation during single-phase recloser and three-phase recloser, the author put forward a new distance protection accelerating scheme. According to the schemes, a general schemes for auto recloser accelerating protection is presented which improves performance of accelerating protection.