• Compact and cost-effective overcurrent protection device
• High-performance protection features guarantee safety
• Data security and transparency throughout the entire life cycle of the system save time and reduce costs
• Clear and easy-to-use devices and software thanks to user-friendly design
• Increased quality and reliability of the engineering process
• High degree of overall safety and security based on thorough implementation
• High-performance communications components guarantee safe and effective solutions
• Full compatibility with IEC 61850 Edition 1 and 2
• Future proof system solutions provide high investment security and low operation costs

The overcurrent protection device SIPROTEC 7SJ82 is a universal protection, control and automation device on the basis of the SIPROTEC 5 system. It is especially designed for the protection of feeders and lines.

Typical feeder and overcurrent applications are:

• Detection of short circuits in electric operational equipment of radial networks, lines which are supplied from one or two sides, parallel lines and open or closed looped networks of all voltage levels
• Detection of ground faults in isolated or resonant-grounded systems with radial, ring-shaped or meshed topology
• Backup protection of differential protective schemes of all types of lines, transformers, generators, motors, and busbars
• Protection and monitoring of capacitor banks
• Phasor Measurement Unit (PMU)
• Reverse power protection
• Load-shedding applications
• Switchover automation.

Application templates

• Application templates are available in DIGSI for standard applications. They comprise all basic configurations and default settings.

The following application templates are available:

Non-directional overcurrent protection

• Overcurrent protection (non-directional) for phases and ground
• Transformer inrush current detection

Directional overcurrent protection – grounded system

• Overcurrent protection (directional and non-directional) for phases and ground
• Transformer inrush current detection
• Measuring voltage failure supervision

Directional overcurrent protection – resonant-grounded / isolated system

• Overcurrent protection (directional and non-directional) for phases
• Sensitive directional ground fault detection for static ground faults
• Sensitive directional ground fault detection for transient and static ground faults (“transient” function)*
• Transformer inrush current detection
• Measuring voltage failure supervision

Capacitor bank: H-connection

• Overcurrent protection for phase and ground
• Current-unbalance protection for capacitor banks
• Peak overvoltage protection
• Overload protection
• Undercurrent protection

DIGSI 5 permits all functions to be configured and combined as required.

• Directional and non-directional time overcurrent protection with additional functions
• Optimized tripping times due to directional comparison and protection data communication
• Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos φ, sin φ, harmonic, dir. Detection of intermittent ground faults and admittance
• Ground fault detection using the pulse detection method
• Arc protection
• Overvoltage and undervoltage protection
• Frequency protection and frequency change protection for load shedding applications
• Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due to decentralized power generation into consideration
• Power protection, configurable as active or reactive power protection
• Directional reactive power undervoltage protection (QU protection)
• Circuit-Breaker Failure Protection
• Circuit breaker monitoring
• Graphical logic editor to create powerful automation functions in the device