Description The SIPROTEC 7SJ85 overcurrent protection has been designed specifically for the protection of feeders and lines. With its modular structure, flexibility, and the high-performance DIGSI 5 engineering tool, the SIPROTEC 7SJ85 device offers futureoriented solutions for protection, control, automation, monitoring, and Power Quality - Basic.. Main function Feeder and overcurrent protection for all voltage levels Inputs and out- 5 predefined standard variants with 4 puts current transformers, 4 voltage trans formers, 11 to 59 binary inputs, 9 to 33 binary outputs Hardware flexibi- Flexibly adjustable and expandable I/O lity quantity structure within the scope of the modular SIPROTEC 5 system; 1/6 expansion modules can be added, available with large or small display, or without display Housing width 1/3 x 19 inch to 2/1 x 19inch Applications • Detection and selective 3-pole tripping of short circuits in electrical equipment of star networks, lines with infeed at 1 or 2 ends, parallel lines, and open-circuited or closed ring systems of all voltage levels up to AC 400 V • Backup protection for differential protection devices of all kind for lines, transformers, generators, motors, and busbars • Protection and monitoring of capacitor banks • Phasor Measurement Unit (PMU) • Reverse-power protection • Load shedding applications • Automatic switchover • Regulation or control of power transformers (two- winding transformers, three-winding transformers, grid coupling transformers) Feeder and overcurrent protection SIPROTEC 7SJ85 (housing width 1/3 x 19'' to 2/1 x 19'') • 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. • Directional and non-directional overcurrent protection with additional functions • Protection of up to 9 feeders with up to 40 analog inputs • Optimized tripping times due to directional comparison and protection data communication • Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground-fault function, cos 0, sin 0, dir. detection of intermittent ground faults, harmonic detection, and admittance measurement • Arc protection • Ground fault detection using the pulse detection method • Detection of intermittent ground faults with automatic blocking of statically measuring functions to avoid message and fault-record flooding • Arc pro

• Fault locator plus for accurate fault location with in-homogenous line sections and targeted automatic overhead-line section reclosing (AREC) • Overvoltage and undervoltage protection • Power protection, configurable as active or reactive-power protection • Frequency protection and frequency-change protection for load-shedding applications • Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due to decentralized power generation into consideration • Protection functions for capacitor banks, such as overcurrent, overload, current-unbalance, peak overvoltage,...