This paper investigates the dynamic behavior of a 220 kV mixed overhead-underground transmission line compensated with a shunt reactor, focusing on the current zero-missing phenomenon and switching overvoltages. Zero-missing phenomemon, a condition where current through the circuit breaker fails to reach zero, affects circuit breaker operation and system stability, particularly in shunt-compensated systems. Key factors influencing this issue include cable length, cable configurations, reactive power compensation, and switching strategies. Using EMTP/ATP simulations on a real grid model, the study evaluates strategies to mitigate the zero-missing phenomenon such as pre-insertion resistors, compensation ratios, and connections to high-power loads. Transient overvoltage on cable cores and sheaths during switching are also analyzed.
