The protection relay DIA4L belongs to SIGMA-L digital protection line and it performs three phase overvoltage and undervoltage protection, overfrequency and underfrequency protection, residual overvoltage protection; it could be used as interface protection for active Users connected to MV electric power system.
DIA4L protection relay is compliant with Italian document Norma CEI 0-16 (2019-04) in reference to “interface protections”.