differential protection relay / voltage / distance / digital
7SL82/86/87 series

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differential protection relay differential protection relay - 7SL82/86/87 series


  • Measured/monitored value:

    voltage, distance

  • Other characteristics:

    digital, differential, modular, compact, with integrated transformer, transmission line, panel-mount


The combined SIPROTEC 7SL82/86/87 line differential and distance protection have been designed particularly for the cost-optimized and compact protection of lines in medium-voltage and high voltage systems. With their flexibility and the high-performance DIGSI 5 engineering tool, SIPROTEC 5 devices offer future-oriented system solutions with high investment security and low operating costs.

Main function:
•Differential protection and distance protection for medium-voltage and high voltage applications
•Interoperability of SIPROTEC 5 and SIPROTEC 4 line protection devices
•3-pole, minimum tripping time: 19 ms
Inputs and outputs:
•4 current transformers,
•4 voltage transformers,
•11 or 23 binary inputs,
•9 or 16 binary outputs
Hardware flexibility:
•Different hardware quantity structures for binary inputs and outputs are available in the 1/3 base module. Adding 1/6 expansion modules is not possible; available with large or small display.
Housing width:
•1/3 × 19 inches

DIGSI 5 permits all functions to be configured and combined as required.
•Minimum tripping time: 19 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
•Several distance-protection functions selectable as backup protection or secondary main protection: Classic, reactance
•method (RMD), impedance protection for transformers
•Directional backup protection and various additional functions