Distance protection for all voltage levels

Distance protection for all voltage levels – SIPROTEC 7SA61


The SIPROTEC 7SA6 distance protection relay is a universal relay for protection, control and automation with a 4-line displayon the basis of the SIPROTEC 4 system. Its high level of flexibility makes it suitable to be implemented at all voltage levels.

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Features & functions

Distance protection for all voltage levels SIPROTEC 7SA61


With this relay you are ideally equipped for the future: it offers security of investment and also saves on operating costs.

  • High-speed tripping time

  • Impedance setting range allows very small settings for the protection of very short lines

  • Self-setting detection for power swing frequencies up to 7 Hz

  • Current transformer saturation detector prevents non-selective tripping by distance protection in the event of CT saturation.

  • Phase-segregated teleprotection for improved selectivity and availability

  • Digital relay-to-relay communication by means of an integrated serial protection data interface

  • Adaptive auto-reclosure (ADT)



  • Binary inputs: 5 to 33
  • Binary outputs: 6 to 33
  • Power relays: 4 / 8
  • Text display
  • Surface-mounting or flush-mounting housing

Communication interfaces

  • System port 
    – IEC 61850

    – IEC 60870-5-103 
    – DNP 3 

    – 2 analog outputs 0...20 mA

  • Service port
    – DIGSI 4
    – Modem
  • 1 serial protection data interface for teleprotection
  • Front port
    – DIGSI 4
  • Time synchronization via IRIG B, DCF 77 or system interface



Protection functions

  • Non-switched distance protection with 6 measuring systems (21/21N)
  • High resistance earth-fault protection for single and three-phase tripping (50N, 51N, 67N)
  • Earth-fault detection in isolated and resonant-earthed networks
  • Tele (pilot) protection (85)
  • Fault locator (FL)
  • Power-swing detection/tripping (68/68T)
  • Phase-overcurrent protection (50/51)
  • Switch-onto-fault protection(50HS)
  • STUB bus overcurrent protection (50STUB)
  • Overvoltage/undervoltage protection(59/27)
  • Over/underfrequency protection (81O/U)
  • Auto-reclosure (79)
  • Synchro-check (25)
  • Breaker failure protection (50BF)
  • Thermal overload protection (49)

Control functions

  • Commands for control of c.b. and isolators

Monitoring functions

  • Trip circuit supervision (74TC)
  • Self-supervision of the relay
  • Measured-value supervision
  • Event logging
  • Fault logging
  • Oscillographic fault recording
  • Switching statistics

Front Design

  • Easy operation with numeric keys
  • Function keys
  • LEDs for local alarm
  • PC front port for convenient relay setting