Description The combined SIPROTEC 7SL82 line differential and distance protection has been designed particularly for the cost-optimized and compact protection of lines in medium-voltage and highvoltage systems. With its flexibility and the powerful DIGSI 5 engineering tool, SIPROTEC 7SL82 offers future-oriented for protection, control, automation, monitoring, and Power Quality - Basic Main function Differential protection and distance protection for medium-voltage and high voltage applications Interoperability of SIPROTEC 4 and SIPROTEC 5 line protection devices Tripping 3-pole, minimum tripping time: 19 ms Inputs and out- 4 current transformers, 4 voltage trans-puts formers (optional), 11 or 23 binary in puts, 9 or 16 binary outputs Hardware flexibi- Different hardware quantity structures lity for binary inputs and outputs are availa ble in the 1/3 base module. Adding 1/6 expansion modules is not possible; available with large or small display. Housing width 1/3 x 19 inches Applications • Line protection for all voltage levels with 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 • Transformers and compensating coils in the protection zone • Detection of ground faults in isolated or arc-suppres-sion-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 fiber, two-wire connections, and communication networks Combined line differential and distance protection relay SIPROTEC 7SL82 (housing width 1/3 x 19'') • Phasor Measurement Unit (PMU) • Detection and recording of power-quality data in the mediumvoltage and subordinate low-voltage power system Functions 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 • Ground-fault detection using the pulse detection method • Adaptive power-swing blocking

Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos 0, sin 0, dir. detection of intermittent ground faults, harmonic detection, and admittance measurement Detection of current-transformer saturation for fast tripping with high accuracy Fault locator plus for accurate fault location with in-homogenous line sections and targeted automatic overhead-line section reclosing (AREC) Arc protection Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due...