SIPROTEC 7SL87 is a line protection device designed for both overhead lines and cables. It combines phase-selective line differential and distance protection and can handle single-ended and multi-ended infeed of all lengths with up to 6 line ends and 1-pole tripping. Designed for flexibility and future-proof performance, it delivers high investment security and low operating costs.
With a modular structure and the powerful DIGSI 5 engineering tool, SIPROTEC 7SL87 provides flexible system solutions that support line protection for multiple configurations and network setups.
SIPROTEC 7SL87 offers differential and distance protection with adaptive algorithms for fast, sensitive, and stable fault detection, even with current-transformer saturation and capacitive charging currents.
Flexible I/O structure and interoperability with SIPROTEC 5 and 4 devices enable easy configuration and integration, while a user-friendly design supports simple device and software handling.
Conformal coating protects electronics in extreme conditions, while robust communication and compliance with NERC CIP and BDEW cybersecurity standards safeguard critical infrastructure.
Main protection function is differential protection with adaptive algorithm for maximum sensitivity and stability, even with the most different transformer errors, current-transformer saturation and capacitive charging currents.
Offers 12 standard variants with 4/4 or 8/8 current/voltage transformers, 5–31 binary inputs, and 8–46 binary outputs. Features a flexibly adjustable I/O structure within the SIPROTEC 5 modular system.
Supports serial protection data communication via optical fibers, two-wire connections and communication networks, including automatic switchover between ring and chain topologies.
Displays all information and diagnostic data via Web browser, including vector diagrams, single-line views and device display pages for simple, quick and secure access.