To effectively address the issue of short-circuit current exceeding the allowable limit in the Ningxia 750 kV power grid

a short-circuit current limitation method based on distributed current limiting devices is proposed. Based on the short-circuit current limiting principle of SF6 fast switches

a short-circuit current evaluation and simulation model of the Ningxia 750 kV power grid with distributed current-limiting devices is established. The whole-grid short-circuit current is calculated

and the sensitivity of the AC component of branch short-circuit currents at 750 kV substations with excessive short-circuit current is evaluated. With the objectives of minimizing short-circuit current and operational risk

the final configuration scheme of distributed current-limiting devices is determined. On this basis

the impact of the current-limiting measures on the DC component of the short-circuit current is further analyzed. The simulation results indicate that the proposed current-limiting measures based on distributed current-limiting devices can effectively solve the problem of short-circuit current exceeding the allowable limit in the Ningxia 750 kV power grid

with only a negligible influence on the DC component of the short-circuit current.