Home Products Protection Relays DRAGON 1RFI 421D1 Multifunction non-directional overcurrent & ground fault protection

RFI 421D1 Multifunction non-directional overcurrent & ground fault protection

RFI 421D1 is designed to be used as a Protection & Local/Remote Control IED mainly for resistance earthed Medium voltage networks but also is suitable for radial HV lines and as a back-up protection for HV, MV sides of power transformers. In case of Transformer back-up protection Restricted Earth fault function for the internal transformer earth faults clearance is available.

The protection is suitable for all types of current transformers - iron-core or linearized (Rogowski coil). 

All relay protection functions meet ANSI and IEC standards’ requirements:

  • Three stages non-directional definite time/instantaneous overcurrent protection
  • Non-directional Inverse time overcurrent protection with 12 inverse time characteristics
  • Three stages non-directional definite time/instantaneous ground fault protection
  • Non-directional Inverse time ground fault protection with 12 inverse time characteristics
  • Definite time undercurrent protection
  • Negative Sequence overcurrent protection
  • Phase discontinuity protection
  • High harmonic content ground fault detection
  • Restricted earth fault protection
  • Thermal overload protection
  • Arc protection
  • Second harmonic blocking (inrush restraint)
  • Cold load pickup
  • Autoreclosing
  • Breaker failure protection
  • Clockwise and anticlockwise phase rotation function
  • Trip circuits supervision
  • Current circuits supervision functions
  • Circuit breaker life time monitoring

Automation and remote control functions

Disturbance (Fault) Recorder

  • Sampling rate – 1 kHz/4kHz
  • User defined trigger conditions and records duration
  • Recording mode -overwrite (ring buffer) or saturate
  • Each sample consists of instantaneous values of all analog and digital values

Event Recorder

  • Up to 1000 records
  • Each event consists of information about the event’s type, some additional data (such as pick-up current, voltage, the time elapsed and so on) and the time stamp of the event (year, month, day, hour, minute, second, millisecond)
  • Recording mode - overwrite

Protocols

  • Configuration tool - ROCON MMI protocol
  • SCADA communication - IEC 60870-5-103, MODBUS

Configuration, setting and administration

Options

  • Optional extension with communication board with 2xFO redundant ethernet ports for IEC61850
  • Optional extension with I/O modules type of RTB-1

 

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Note: All flyers are subject to regular update.