The Siemens SIPROTEC 7SJ82 overcurrent protection is specifically designed for cost-effective and compact protection of feeders, lines and capacitor banks in medium and high-voltage systems. With its flexibility and the high-performance DIGSI 5 engineering tool, the 7SJ82 offers future-oriented solutions for protection, control, automation, monitoring and Power Quality - Basic.

At a glance

• Feeder and overcurrent protection for all voltage levels
• Inputs and outputs
  • 4 current transformers, 4 voltage transformers (optional), 11 or 23 binary inputs, 9 or 16 binary outputs, OR 
  • 8 current transformers, 7 binary inputs, 7 binary outputs
• Different hardware quantity structures for binary inputs and outputs available in the 1/3 base model
• Available with large or small display

Benefits

• Compact and low-cost overcurrent protection
• Safety due to powerful protection functions
• User-friendly design for easy handling of devices and software
• Cybersecurity according to NERC CIP and BDEW Whitepaper requirements (such as logging security-related events and alarms)
• Highest availability even under extreme environmental conditions by standard coating of the modules
• Full compatibility between IEC 61850 Editions 1, 2.0 and 2.1

Applications

• Detection and selective 3-pole tripping of short circuits in electrical equipment of star networks, lines with infeed at one or two ends, parallel lines and open-circuited or closed ring systems of all voltage levels
• Detection of ground faults in isolated or arc-suppression-coil-ground power system in star, ring or meshed arrangement
• Backup protection for differential protection devices of all kinds for lines, transformers, generators, motors and busbars
• Protection and monitoring of simple capacitor banks
• Phasor Measurement Unit (PMU)
• Reverse-power protection
• Load shedding applications
• Automatic switchover
• Regulation or control of power transformers (two-winding transformers)
• Detection and recording of power-quality data in the medium voltage and subordinate low-voltage power system functions

Similar relays

The 7SJ82 is non-modular which does not allow additional expansion IO to be added. The 7SJ85 is the more powerful and expandable version, while the 7SJ86 is designed as a backup relay for line protection.