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ReliServ Solution

The SIPROTEC 4 7SA6 distance protection relay is a universal relay for protection, control and automation with a 4-line display on the basis of the SIPROTEC 4 system. Its high level of flexibility makes it suitable to be implemented at all voltage levels.
With this relay you are ideally equipped for the future: it offers the security of investment and also saves on operating costs.‚Äč
  • 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 trapping by distance protection in the event of CT saturation.
  • Phase-segregated teleportation for improved selectivity and availability
  • Digital relay-to-relay communication by means of an integrated serial protection data interface
  • Adaptive auto-reclosure (ADT)
Protection functions
  • Non-switched distance protection with 6 measuring systems (21/21N)
  • Non-switched distance protection with 6 measuring systems (21/21N)
  • 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)
  • STUB bus overcurrent protection (50STUB)
  • 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
Communication interfaces
  • Front interface for connecting a PC
  • System interface for connecting to a control system via various protocols
    • IEC 60870-5-103 protocol
    • DNP 3.0
    • IEC 61850 Ethernet
  • 1 serial protection data interface for teleportation
  • Rear-side service/modem interface
  • Time synchronization via - IRIG-B or DCF 77 or - System interface

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