PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY
(EFR) receives the input current signals (phase current and neutral current) via four input
current transformers. These signals are galvanically de-coupled, suitably filtered and fed to
the micro-controller, for amplitude calculation and further logical processing.