Siemens Siprotec 4 SIPROTEC 7SA61 Protection Relay

Siemens Siprotec 4 Siprotec 7SA61 Distance Protection Relay For All Voltage Levels

The SIPROTEC 7SA6 distance protection relay is a universal relay for protection, control and automation with a graphic 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 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 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)
• 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

COMMUNICATION INTERFACES

• Front interface for connecting a PC
• System interface for connecting to a control system via various protocols
  – IEC 60870-5-103 protocol
  – PROFIBUS-FMS/-DP
  – DNP 3.0
  – IEC 61850 Ethernet
• 1 serial protection data interface for teleprotection
• Rear-side service/modem interface
• Time synchronization via – IRIG-B or DCF 77 or – System interface

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.