Introduction In the world of power system protection and automation, few software tools are as critical as Siemens DIGSI. For decades, DIGSI has been the industry standard for configuring, parameterizing, testing, and diagnosing Siemens protection relays, particularly the SIPROTEC 4 series. Among the many versions released, Siemens DIGSI 4.95 stands out as one of the most stable, feature-rich, and widely used iterations.