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