The SIPROTEC 7SD87 differential protection device is suitable for the selective protection of overhead lines and cables with single-ended and multi-ended infeed of all lengths with up to 6 ends. Transformers and compensating coils in the protection range are also possible. With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, the SIPROTEC 7SD86 device offers future-oriented solutions for protection, control, automation, monitoring and Power Quality - Basic.

At a glance

• Differential protection
• Interoperability of SIPROTEC 4 and SIPROTEC 5 line protection devices
• 1-pole and 3-pole, minimum tripping time 9 ms
• Inputs and outputs
  • 12 predefined standard variants with 4/4 or 8/8 current/voltage transformers, 5 to 31 binary inputs, 8 to 46 binary outputs
• Flexibly adjustable 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
• Cybersecurity according to NERC CIP and BDEW Whitepaper requirements 
• Highest availability even under extreme environmental conditions by standard coating of the modules

Applications

• Line protection for all voltage levels with 1-pole and 3-pole tripping
• Phase-selective protection of overhead lines and cables with single-ended and multi-ended infeed of all lengths with up to 6 line ends
• Also used in switchgear with breaker-and-a-half layout
• Transformers and compensating coils in the protection zone
• 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
• Phasor Measurement Unit (PMU)
• Detection and recording of power-quality data in the medium voltage and subordinate low-voltage power system