Staged current protecting setting method and generator model

The invention discloses a staged current protecting setting method and a generator model. The method comprises the following steps: obtaining the primary current setting value of the instantaneous current quick break protection of the circuit head end of a circuit through the generator model at the time quantum [0, delta t] according to the setting principle of the instantaneous current quick break protection while performing setting for the instantaneous current quick break protection; obtaining the primary current setting value of the time-limited current quick break protection of the circuit head end of the circuit through the generator model at the time quantum [n delta t, (n+1)delta t] according to the setting principle of the time-limited current quick break protection while performing setting for the time-limited current quick break protection; obtaining the primary current setting value of the definite time over-current protection of the circuit head end of the circuit through the generator model at the time quantum [t1-delta t, t1] according to the setting principle of definite time over-current protection while performing setting for the definite time over-current protection. According to the method, the staged generator model applied to backup protection is adopted, and therefore, the problem of excessive rough model and the resulting low precision can be effectively solved, and as a result, the set definite value is outstanding.