Abstract
The secondary system of smart substation replaces the cable communication of traditional substation with network communication, which greatly improves the information sharing of substation. At the same time, it also makes the operation of secondary safety measures complex, without obvious electrical break point, and the reliability of secondary safety measures is difficult to guarantee. Firstly, the concept and basic principles of secondary safety measures in smart substations are discussed, and the reasons for the low reliability of secondary safety measures are analyzed. Secondly, three solutions are summarized, which are preview check, online error prevention and automatic generation of secondary safety measures. Then the difficulties of engineering application are analyzed. Finally, the future development direction of secondary safety measures is prospected.
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