Recognition of the Fault Regimes for the Remote Electrical Objects

This issue is urgent. Russian 6 to 110 kV electric networks are among the most widespread and extended and supply power to both industrial and municipal customers. It is a frequent case that networks of the voltage classes are based on the radial principle that simplifies the relay protection and automation (RPA), but at the same time the use of a simple technical solutions is problematic in terms of technical and informational performance as compared to solutions of higher voltage class networks. This is particularly evident in the backup protection design.Herein are proposed solutions. Expanding the knowledge base of relay protection and the use of adaptive principles in design thereof can solve the abovementioned problems. The paper discusses the issues of improving the sensitivity of relay protection with the relative selectivity that ensures recognition of fault for the electrical “remote” objects. This approach is discussed as an example of relaying electrical networks, which include overhead lines and transformers. Increase in the number of monitored parameters in addition to the information signs in some cases can prevent damage and eliminate the “dead” zone with the fault recognizability effect.