The invention discloses a zero-sequence inverse
time limit dynamic setting method and
system based on
time domain fault positioning. The method comprises the following steps: acquiring
voltage and current at a protection installation position; constructing a fault
distance measurement equation according to the collected
time domain information, and solving to obtain fault
distance measurement; obtaining a zero-sequence inverse
time limit time adjustment coefficient according to fault
distance measurement; standard action time is calculated by using the zero-sequence inverse
time limit over-current protection action
time function, and the standard action time is corrected by using the time adjustment coefficient to obtain corrected zero-sequence inverse time limit over-current protection action time; and determining a final
time constant value of the zero-sequence inverse time limit
overcurrent protection action according to the corrected zero-sequence inverse time limit
overcurrent protection action time, the zero-sequence inverse time limit matching time and the zero-sequence inverse time limit minimum action time. On the premise of maintaining protection selectivity, the high-resistance fault response speed is remarkably increased, and the zero-sequence inverse time limit
overcurrent protection performance is improved.