SIPROTEC 7SL87

The SIPROTEC 7SL87 is a combined phase-selective line differential and distance protection for overhead lines and cables with single-ended and multi-ended infeed of all lengths with up to 6 line ends and 1-pole tripping. 

Its modular structure and flexibility, coupled with the high-performing DIGSI 5 engineering tool, allows the SIPROTEC 5 7SL87 to offer future-oriented system solutions with high investment security and low operating costs.

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DESCRIPTION

Basic Features

  • Differential and distance protection
  • Tripping: 1-pole and 3-pole
  • Minimum tripping time: 9 ms
  • 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
  • A number of distance-protection functions selectable as backup protection or secondary main protection: Classic, reactance method (RMD), and impedance protection for transformers
  • Directional backup protection and various additional functions
  • Adaptive power-swing blocking and out-of-step protection
  • Uses pulse detection method to detect transient ground faults
  • Detection of current-transformer saturation with high accuracy for fast tripping
  • Fault Locator Plus function with inhomogeneous line sections and targeted automatic overhead-line section reclosing (AREC) to accurately identify fault location
  • Arc protection
  • Automatic frequency relief for underfrequency load shedding, taking the changed infeed conditions arising from decentralized power generation into consideration
  • Directional reactive power undervoltage protection (QU protection)
  • 1-pole automatic reclosing function with detection secondary arc (SAD)
  • Control, synchrocheck and switchgear interlocking protection
  • Up to 4 pluggable communication modules, usable for different and redundant protocols (IEC 61850-8-1, IEC 61850-9-2 Client, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET I/O, and PROFINET I/O S2 redundancy)
  • Reliable data transmission via PRP and HSR redundancy protocols
  • Extensive cybersecurity functionality (e.g. role-based access control (RBAC), protocolling security-related events, signed firmware or authenticated network access IEEE 802.1X)
  • Provides simple, quick and secure access to the device via a standard Web browser to display all information and diagnostic data, as well as vector diagrams, single-line diagrams, and device display pages
  • Phasor Measurement Unit (PMU) for synchrophasor measured values and IEEE C37.118 protocol
  • Time synchronization using IEEE 1588
  • Enables powerful fault recording (buffer for a max. record time of 80 sec. at 8 kHz or 320 sec. at 2 kHz)
  • Flexible adjustment of I/O quantity structure within the scope of the SIPROTEC 5 modular system