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Time synchronism is a key technology of organizing digital signals in electric power automation system. Currently, the rapidly developing theory of digital automation system is based on ideal time domain. However, the time synchronism system, which provides time domain information, could be affected by various factors in implementation. When time information output can not meet the requirement, the calculated results based on it will deviate from the actual situation. Therefore, it is necessary to study the error of time synchronism system and its impact on digital automation system quantitatively. This paper uses the example of automation system in digital substation, quantitatively analyzes the operational status of power automation system with different time synchronism qualities and the redundancy of power automation system at typical failure or disturbance to time synchronism system. Experiments have been done with time synchronism system analyzers and digital substation emulation systems in CEPRI, and the results validate the analysis.