The series current limiting reactor can effectively limit the short-circuit current of 500 kV voltage level

but it will affect the power flow distribution and transient stability of the system when it is connected to the system. The power flow change and the maximum power angle difference change under the fault scenario of 500 kV/90 kA current limiter based on high coupling reactance type are studied by using BPA simulation software in Guangnan railway station. The results show that when the coupling coefficient of 500 kV current limiter is 0.97

the external leakage reactance is small

which will not affect the node voltage in normal operation of the system.However

the leakage reactance of the external performance may still cause the increase of reactive power loss. With the decrease of the coupling coefficient

the leakage reactance of the current limiter increases

which will pull down the normal working voltage of the node and increase the reactive power loss.