SIPROTEC 7SA522 - Distance protection for transmission lines

4xI 4xV, text display, MHO, 1-/3-pole tripping

The SIPROTEC 7SA522 relay provides full-scheme distance protection and incorporates all functions usually required for the protection of a power line. The relay is designed to provide fast and selective fault bbbbbance on transmission and subtransmission cables and overhead lines with or without series capacitor compensation. The power system star point can be solid or resistance grounded (earthed), resonant-earthed via Peterson coil or isolated. The SIPROTEC 7SA522 is suitable for single-pole and three-pole tripping applications with and without bbbe (pilot) protection schemes

Features

The SIPROTEC 7SA522 incorporates several protective functions usually required for transmission line protection:

• High-speed tripping time
• Suitable for cables and overhead lines with or without series capacitor compensation
• Self-setting power swing detection for power swing frequencies up to 7 Hz
• Digital relay-to-relay communication for two and three terminal topologies
• Adaptive auto-reclosure (ADT)

Hardware

• Binary bbbbbs: 8 to 24
• Binary outputs : 16 to 44
• High-speed trip outputs: 5/10 (optional)
• Text display
• Surface-mounting or flush-mounting housing

Communication interfaces

• System port
  • IEC 61850
  • IEC 60870-5-103
  • PROFIBUS DP– DNP 3
• Service port
  • DIGSI 4
  • Modem
• 2 serial protection data interface for bbbeprotection
• Front port
  • DIGSI 4
• Time synchronization via IRIG B, DCF 77 or system interface

Product homepage - downloads from the internet (catalogue, certificates, firmware, manuals,...)

www.siemens.com/7SA522

Protection functions

• Non-switched distance protection with 6 measuring systems (21/21N)
• High resistance ground (earth)-fault protection for single and three-phase tripping (50N, 51N, 67N)
• bbbe (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)
• Over/undervoltage protection (59/27)
• Over/underfrequency protection (81O/U)
• Auto-reclosure (79)
• Synchro-check (25)
• Breaker failure protection (50BF)

Control functions

• Commands for control of CB 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

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

SIPROTEC 7SA61 - Distance protection for all voltage levels

4xI 4xV, text display, 1-/3-pole tripping

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.

Features

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 transbbbber saturation detector prevents non-selective tripping by distance protection in the event of CT saturation.
• Phase-segregated bbbeprotection for improved selectivity and availability
• Digital relay-to-relay communication by means of an integrated serial protection data interface
• Adaptive auto-reclosure (ADT) 

Hardware

• Binary bbbbbs: 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
  • PROFIBUS DP– DNP 3
  • 2 analog outputs 0...20 mA
• Service port
  • DIGSI 4
  • Modem
• 1 serial protection data interface for bbbeprotection
• Front port
  • DIGSI 4
• Time synchronization via IRIG B, DCF 77 or system interface

Product homepage - downloads from the internet (catalogue, certificates, firmware, manuals,...)

www.siemens.com/7SA61

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
• bbbe (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 relayMeasured-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