The SIPROTEC 7SJ86 overcurrent protection has been specifically designed as backup or emergency protection for the line protection devices. With its modular structure, flexibilbity and the high-performance DIGSI 5 engineering tool, the SIPROTEC 7SJ86 device offers future-oriented solutions for protection, control, automation, monitoring, and Power Quality – Basic.

At a glance

• Overcurrent protection (V/inverse-time-overcurrent protection)
• Tripping - 3-pole
• Inputs and outputs
  • 3 predefined standard variants with 4/4 current transformers/voltage transformers. 11 to 23 binary inputs, 9 to 25 binary outputs
• Flexibly adjustable and expandable I/O quantity structure within the scope of the SIPROTEC 5 modular system

Benefits

• Safety due to powerful protection functions
• User-friendly design for easy handling of devices and software 
• Highest availability even under extreme environmental conditions by standard coating of the modules
• Cybersecurity in accordance with NERC CIP and BDEW Whitepaper requirements

Applications

• Backup and emergency protection for line protection
• 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
• Used in switchgear with breaker-and-a-half layout configuration
• Detection of ground faults in isolated or arc-suppression-coilground power systems in star, ring, or meshed arrangement
• Serial protection communication with SIPROTEC 5 and SIPROTEC 4 devices over different distances and physical media, such as optical fibre, two-wire connections, and communication networks