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.
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 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)
Hardware
- 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
– PROFIBUS DP
– 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
Functions
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
- asy operation with numeric keys
- Function keys
- LEDs for local alarm
- PC front port for convenient relay setting
