Siemens Siprotec 5 7SD86 Line Differential Protection Relay

The line differential protection SIPROTEC 7SD86 Line Differential Protection Relay is part of the advanced SIPROTEC 5 Protection Relay Series, which includes modular, flexible, and intelligent digital field devices. Moreover, this relay is designed to meet the protection requirements of modern power systems. Additionally, its modular design allows easy adaptation to different substation configurations.

Furthermore, when combined with the high-performance DIGSI 5 Engineering Tool, the SIPROTEC 7SD86 fits perfectly for protection, control, monitoring, and measuring applications in electrical energy systems. As a result, utilities and industries can improve operational efficiency and system reliability.

Main Function

• Firstly, differential protection ensures fast and accurate detection of faults in transmission lines.

Tripping

• The relay supports 3-pole tripping.

• Moreover, it offers a minimum tripping time of 9 ms. Therefore, faults can be cleared quickly to maintain system stability.

Inputs and Outputs

• The device provides 12 predefined standard variants with 4/4 or 8/8 current and voltage transformers.

• Additionally, it supports 5 to 31 binary inputs.

• Also, it includes 8 to 46 binary outputs, enabling flexible system integration.

Hardware Flexibility

• In addition, the relay offers a flexibly adjustable I/O quantity structure within the scope of the SIPROTEC 5 modular system. Consequently, engineers can configure the relay according to project needs.

Housing

• Finally, the housing width ranges from 1/3 × 19” to 2/1 × 19”, therefore allowing convenient installation in various control panel configurations.

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.

Function

• Minimal tripping time: 9 ms
• Directional backup protection and various additional functions
• Arc protection
• Power protection, configurable as active or reactive power protection
• 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
• Automatic frequency relief for load shedding in case of underfrequency, taking account of changes in infeed conditions due to decentralized power generation
• Detection of current-transformer saturation
• 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
• 3-pole automatic reclosing function
• Control, synchrocheck, and switchgear interlocking protection
• A graphical logic editor to create powerful automation functions in the device
• Single line representation in a 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 fibers, two-wire connections and communication networks (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)
• Flexibly adjustable I/O quantity structure

SIPROTEC 7SD86

SIPROTEC 5 is part of the new generation of incomparable modular, flexible, and intelligent digital field devices. Additionally, with modularly designed hardware and software and its high-performance DIGSI 5 engineering tool, the SIPROTEC 5 product family of field devices is 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.