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The 58.9-km, 161-kV Taiwan PengHu submarine power cable system (T-P-Cable), the first submarine project of the Taiwan Power Company (Taipower) in this level, will be commercially operated in 2012. It is important to analyze the transient behaviors before operation. It is necessary to find the operation strategy to deal with the transients in advance. The EMTP-ATP was used in this paper to analyze (1) the switched over voltage (SOV) in normal operation, (2) the slow front transients (SFT) voltage in fault contingency, (3) the transient inrush current (TIC) in energizing of the no-load transformers and shunt reactors, and (4) the transient recover voltage (TRV) in de-energizing the shunt reactors. The appropriate set of the surge protective device (SPD) to avoid the SOV and SFT has also been investigated. The results show that there is no TIC in energizing the no-load transformers and shunt reactors. The TRV across the current breaker (CB) contactors is higher than the system TRV when the shunt reactors are de-energized without using SPD. There is no re-strike on the CB contactors. The results of this study provide tremendous prior operation experience and advice for the Taipower.