SIPROTEC-7SJ85

Key Benefits:

Reliable Protection: Provides powerful and selective protection for feeders, distribution lines, and capacitor banks.

Flexible Design: Modular structure allows for scalable I/O configuration and hardware expansion.

User-Friendly Operation: Easy setup, operation, and diagnostics through DIGSI 5 and integrated web interface.

Cybersecurity Ready: Fully compliant with NERC CIP and BDEW Whitepaper, featuring secure firmware, RBAC, and authenticated access (IEEE 802.1X).

High Availability: Conformal coating ensures stable performance even in harsh environmental conditions.

Future-Proof Communication: Fully compatible with IEC 61850 Editions 1, 2.0, and 2.1, including GOOSE messaging, PRP/HSR, and more.

Main Functions:

Feeder and Overcurrent Protection:

• Directional and non-directional overcurrent protection
• Protection of up to 9 feeders with up to 40 analog inputs
• Fault locator and automatic overhead line reclosing (AREC)

Ground Fault Detection:

• Supports various detection methods such as 3I₀>, V₀>, transient detection, harmonic detection, admittance measurement, and pulse detection
• Advanced detection of intermittent ground faults with blocking features to prevent false recordings

Capacitor Bank Protection:

• Overcurrent, overload, peak overvoltage, current unbalance, and differential protection

Additional Protection Functions:

• Arc flash protection
• Voltage protection (over/under)
• Power and reactive power protection (QU protection)
• Frequency-based load shedding and change detection
• Point-on-wave switching
• Circuit-breaker failure protection and reignition monitoring

Automation & Control:

• Graphical logic editor for creating complex logic
• Synchrocheck and switchgear interlocking
• Transformer regulation and load control (for 2- or 3-winding transformers)

Inputs, Outputs & Hardware Options:

Predefined Variants:

• 4 current transformer inputs
• 4 voltage transformer inputs
• 11 to 59 binary inputs
• 9 to 33 binary outputs

Flexible Housing:

• Sizes from 1/3 × 19″ up to 2/1 × 19″
• Available with small, large, or no display

Expandable I/O:

• Modular SIPROTEC 5 system supports 1/6 expansion modules

Communication & Cybersecurity:

Integrated Ethernet (RJ45) and up to 4 pluggable communication modules

Protocols supported:

• IEC 61850-8-1, IEC 61850-9-2 Client
• IEC 60870-5-103/104
• Modbus TCP, DNP3 (serial & TCP)
• PROFINET IO, including S2 redundancy

Network Flexibility:

• Virtual network sharing (IEEE 802.1Q VLAN)
• Redundant protocols: PRP and HSR
• Serial communication via optical fiber, two-wire, and IEEE C37.94

Web Browser Access:

• Secure access to all device information, single-line views, diagnostics, and vector diagrams

Monitoring & PQ Functions:

Power Quality Monitoring (PQ Basic):

• Voltage unbalance, overvoltage, dips, interruptions
• TDD, THD, and harmonic distortion monitoring

Phasor Measurement Unit (PMU):

• Synchrophasor measurements using IEEE C37.118

Time Synchronization:

• IEEE 1588 Precision Time Protocol

Powerful Fault Recording:

• Max. 80 sec at 8 kHz or 320 sec at 2 kHz

Applications:

• Feeder Protection in radial, looped, or meshed networks across LV, MV, and HV systems
• Selective Tripping for lines with single/double-end infeed and open/closed ring systems
• Backup Protection for lines, transformers, generators, motors, and busbars
• Capacitor Bank Monitoring and Protection
• Load Shedding and Frequency Control
• Automatic Switchover and Transformer Control

Summary

The SIPROTEC 7SJ85 delivers a comprehensive and future-proof protection platform that meets the needs of modern power systems—from simple feeders to complex grid structures—while ensuring high reliability, cybersecurity, and easy system integration.