At present

there are few studies on the bearing capacity and safety of spacer rod under short-circuit fault of ultra high voltage (UHV) DC transmission line. This paper takes an actual ±800 kV transmission line as an example

a real UHV DC transmission network simulation model including rectifier side

transmission line and inverter side is built through real time digital simulator (RTDS) dynamic model test system. The variation of short circuit current in short-circuit process has been simulated and the influence of protection action time on short-circuit current has been analyzed. The finite element model of dynamic simulation including conductor and spacer has been established. The short-circuit current was applied to the model as the load

and the dynamic variation process of the transmission line displacement and spacer bearing capacity under the actual short-circuit current has been analyzed. The safety status of the spacer is evaluated.