Siemens Siprotec 5 7SD87 Line Differential Protection Relay

The line differential protection SIPROTEC 7SD87 is part of the new SIPROTEC 5 series of modular, flexible and intelligent digital field devices. With its modularity and flexibility and its high-performance DIGSI 5 engineering tool, the SIPROTEC 7SD87 fits perfectly for protection, control, monitoring, and measuring applications in electrical energy systems Main function: Differential ProtectionTripping:1- and 3-pole, min. tripping time 9 ms Inputs and outputs:12 predefined standard variants with 4/4 or 8/8 current/voltage transformers, 5 to 31 binary inputs, 8 to 46 binary outputs Hardware flexibility: Flexibly adjustable I/O quantity structure within the scope of the SIPROTEC 5 modular system Housing width:1/3 x 19” to 2/1 x 19”

All functions can be configured freely with DIGSI 5. For the application of some of the functions, you require the appropriate number of free function points within the device. The function point calculator in the online configurator provides support in determining the required number of function points for your device.

• Minimal 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
• Detection of ground faults of any type in isolated or arc-suppression-coil-ground systems using the following functions: 3I0>, V0>, fleeting contact, Cos-/SinPhi, harmonic, dir. detection of intermittent ground faults and admittance
• Ground fault detection using the pulse location method
• Detection of current-transformer saturation
• Arc protection
• Automatic frequency relief for load shedding in case of underfrequency, taking account of changed infeed conditions due to decentralized power generation
• Power protection, configurable as active or reactive power protection
• Reactive power-undervoltage protection (QU protection)
• Detection of current and voltage signals up to the 50th harmonic with high accuracy for selected protection functions (such as thermal overload protection) and operational measured values
• 1-/3-pole automatic reclosing function
• Control, synchrocheck and switchgear interlocking protection
• Graphical logic editor to create powerful automation functions in the device
• Single line representation in small or large display
• Integrated electrical Ethernet RJ45 for DIGSI 5 and IEC 61850 (reporting and GOOSE)
• Up to 4 optional pluggable communication modules, usable for different and redundant protocols (IEC 61850, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET IO)
• Serial protection data communication via optical fi-bers, two-wire connections and communication net-works (SDH networks, MPLS networks, for example using IEEE C37.94, and others), including automatic switchover between ring and chain topology
• Redundancy protocols PRP and HSR
• Cyber security to NERC CIP and BDWE Whitepaper requirements
• Phasor Measurement Unit (PMU) for synchrophasor measured values and IEEE C37.118 protocol
• Time synchronization using IEEE 1588
• Powerful fault recording (buffer for a max. record time of 80 sec. at 8 kHz or 320 sec. at 2 kHz)
• Auxiliary functions for easy tests and commissioning
• Flexibly adjustable I/O quantity structure within the scope of the SIPROTEC 5 modular system

SIPROTEC 5 is part of the new generation of incomparable modular, flexible, and intelligent digital field devices. With modularly designed hardware and software and its high-performance DIGSI 5 engineering tool, the SIPROTEC 5 product family of field devices are perfect for protection, control, monitoring, and measuring applications in electrical energy systems. SIPROTEC 5 offers a wide product range with modular elements for every application and requirement.