Siemens Siprotec 4 SIPROTEC 7SA522 Protection Relay
Description
Siemens Siprotec 4 SIPROTEC 7SA522 Protection Relay
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 clearance on transmission and sub-transmission 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 the (pilot) protection schemes.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)
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)
- 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)
- 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
COMMUNICATION INTERFACES
- Front interface for connecting a PC
- System interface for connecting to a control system via various protocols
– IEC 61850 Ethernet
– IEC 60870-5-103 protocol
– PROFIBUS-FMS/-DP
– DNP 3.0 - 2 serial protection data interfaces for tele (pilot) protection
- Rear-side service/modem interface
- Time synchronisation via IRIG B or DCF77 or system interface
HARDWARE
- Binary inputs: 8/16/24
- Output relays: 16/24/32
- High-speed trip outputs: 5 (optional)
SIPROTEC 4 leads the way in integrating protection, control, measurement, and automation functions in one device. The homogenous system platform, the unique DIGSI 4 engineering program, and extensive experience of more than a million successfully operating devices in the field worldwide – thanks to these unique advantages, SIPROTEC 4 enjoys top recognition among users worldwide. SIPROTEC 4 is the industry standard for digital protection technology today in all fields of application.
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