Numerical Draw-out 3

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.

• Three phase , low-set, non - directional Over current relay with inverse definite minimum time (IDMT) or definite time characteristics
• Modular Integrated Draw Out System for field adaptability and tropicalised design (MIDOS)
• RS-485 communication port with modbus protocol
• Relay test facility with relay trip & without relay trip
• Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set
• Definite time curve for both Phase & Earth along with optional user defined curve.
• Low AC burden
• Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC
• Non-Volatile memory for data retention and retrieval in the event of power failure
• Consistent repeat accuracy
• High Drop-off/Pick-up ratio
• Poly carbonate front cover with external reset switch