Research on Relay Protection Schema and Protection Setting of Large Capacity Synchronous Condenser

Now, the large capacity synchronous condensers are needed in the State Grid. However, the research on its protection is rare. Based on its application in AC/DC converter stations, this paper summarizes the studies of the relay protection function and schema about large capacity synchronous condensers and transformer group, furthermore analyzes the main protection principle and setting principle of relay protection (differential protection, inter-turn protection, stator grounding protection, etc). At last an example of setting value of synchronous condenser and transformer group protection in converter station is given.