The provision of electrical energy, which has the highest priority among critical infrastructure in Slovenia, consists of substations. Inside each the substation, there are intelligent electronic devices which are products of various manufacturers and are a weak spot in providing secure information. Successful and secure communication between these devices are the two most important aspects of IED.
This diploma thesis focuses on communication standard IEC 61850, designed for communication between intelligent electronic devices and security standard IEC 62351, providing various security mechanisms for profiles as TCP/IP, MMS, IEC 60870-5 and IEC 61850.
The aim is to analize features of both of standards, especially those enabling interoperability. Security mechanism implemented in IEDs and minimal requirements regarding those IEDs are also described in depth. At the end, security solutions for cyber security of smart grid substations are outlined. Despite known stipulations listed in standard IEC 62351, built-in IEDs are not capable of executing these provisons, leaving space for vulnerability.