Siemens SIPROTEC 5 7SL87 Line Differential & Distance Protection Relay

Main function: Differential and Distance Protection ، Tripping: 1- and 3-pole, minimum tripping time 9 ms ، Inputs/Outputs: 12 predefined variants with 4/4 or 8/8 current/voltage transformers, 5–31 binary inputs, 8–46 binary outputs ، Hardware flexibility: Adjustable I/O quantity structure within SIPROTEC 5 modular system ، Width of housing: 1/3 × 19” to 2/1 × 19” ، Configurable with DIGSI 5; function point calculator for required points ، Adaptive differential protection with high sensitivity and stability ، 1-/3-pole automatic reclosing ، Distance protection selectable: classic, reactance method, transformer impedance ، Directional backup and additional functions, adaptive power-swing blocking, out-of-step protection ، Ground fault detection in isolated or arc-suppression-coil-ground systems ، Arc protection, automatic frequency relief for underfrequency load shedding ، Reactive power-undervoltage protection (QU) ، Detection of current and voltage harmonics up to the 50th for selected protection functions ، Control, synchrocheck, and switchgear interlocking ، Graphical logic editor for automation ، Single line representation in small or large display ، Integrated Ethernet RJ45 for DIGSI 5 and IEC 61850, up to 4 optional pluggable communication modules ، Serial communication via optical fiber, two-wire, networks; automatic ring/chain switchover ، Redundancy protocols PRP and HSR ، Cybersecurity compliant with NERC CIP and BDWE Whitepaper ، Phasor Measurement Unit (PMU) and IEEE C37.118 ، Time synchronization IEEE 1588 ، Fault recording buffer: up to 80 sec at 8 kHz or 320 sec at 2 kHz ، Auxiliary functions for tests and commissioning