Siemens SIPROTEC 7SA522 Distance Relay

Siemens Siprotec 4 SIPROTEC 7SA522 Distance Relay – 4xI 4xV, text display, MHO, 1-/3-pole tripping

The SIPROTEC 7SA522 Distance Relay is a state-of-the-art protection relay designed to provide accurate, fast, and reliable distance protection. Specially, for power systems in industrial and utility applications across Mumbai. Belonging to the renowned SIPROTEC 4 series, it combines advanced technology with proven reliability. However, it makes it ideal for modern power networks.

Equipped with 4xI/4xV inputs and a user-friendly text display. Moreover, the SIPROTEC 7SA522 offers clear monitoring and control, allowing engineers to quickly assess system conditions. Its MHO characteristic ensures precise distance measurement and fault detection. Anyhow, the 1-/3-pole tripping capability delivers flexible protection for a variety of system configurations.

This relay is designed for high-speed performance, operational accuracy, and robust reliability. Consequently, ensuring continuous system stability even under demanding conditions. In addition, its integration-friendly design supports seamless connection to SCADA and automation systems. Moreover, making it a preferred choice for utilities, industrial plants, and large-scale electrical installations.

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

Siemens SIPROTEC 4 leads the way in integrating protection, control, measurement, and automation functions in one device. Additionally, the homogenous system platform, the unique DIGSI 4 engineering program. Moreover, extensive experience of more than a million successfully operating devices in the field worldwide