Siemens Siprotec 5 7SD82 Line Differential Protection Relay

The line differential protection relay SIPROTEC 7SD82 Line Differential Protection Relay is part of the advanced SIPROTEC 5 Protection Relay Series modular field devices. Moreover, this device is specially designed for cost-effective and compact medium-voltage and sub-transmission application areas. Therefore, it is well-suited for utilities that require reliable protection in limited panel space.

Furthermore, with its flexibility and the high-performance DIGSI 5 Engineering Tool, the SIPROTEC 7SD82 fits perfectly for protection, control, monitoring, and measuring applications in electrical energy systems. As a result, engineers can efficiently configure and operate the relay in modern substations.

Main Function

• Line differential protection for medium-voltage and sub-transmission networks ensures accurate fault detection and fast isolation.

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 supports 4 current transformers.

• Additionally, 4 voltage transformers are available as an optional configuration.

• Also, it provides 11 or 23 binary inputs.

• Moreover, it supports 9 or 16 binary outputs for flexible control and monitoring.

Hardware Flexibility

• Various hardware quantity structures are available for binary inputs and outputs in the 1/3 base module.

• However, it is not possible to add 1/6 expansion modules.

• Additionally, the relay is available with both large and small display options for better operational convenience.

Housing

• Finally, the housing width is 1/3 × 19 inches, therefore making it suitable for compact panel installations.

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

• Minimum tripping time: 19 ms for fast and reliable fault isolation.

• Differential protection with an adaptive algorithm ensures high sensitivity and stability during transformer faults.

• Maintains stable performance even with transformer errors, CT saturation, and capacitive charging currents.

• Includes directional backup protection with multiple additional protection functions.

• Detects ground faults in isolated or arc-suppression-coil grounded systems using 3I0>, V0>, Cos/Sin Phi, harmonic, and admittance methods.

• Supports directional detection of intermittent ground faults for accurate system monitoring.

• Provides ground fault detection using the pulse location method.

• Detects current-transformer saturation for reliable protection performance.

• Includes arc protection to enhance system and equipment safety.

• Offers automatic frequency relief for load shedding during underfrequency conditions.

• Considers changing infeed conditions caused by decentralized power generation.

• Provides power protection configurable for active or reactive power monitoring.

• Includes reactive power undervoltage protection (QU protection).

• Measures current and voltage signals up to the 50th harmonic for precise protection and monitoring.

• Supports control, synchrocheck, and switchgear interlocking protection.

• Features a graphical logic editor for creating advanced automation functions.

• Displays single-line diagrams on small or large integrated device displays.

• Provides integrated Ethernet RJ45 ports for DIGSI 5 engineering and IEC 61850 communication.

• Supports two optional pluggable communication modules for protocols such as IEC 61850, IEC 60870-5-103/104, Modbus TCP, DNP3, and PROFINET IO.

• Enables secure protection of data communication via optical fiber, two-wire connections, and communication networks.

• Allows automatic switchover between ring and chain communication topologies.

• Supports PRP and HSR redundancy protocols for high network reliability.

• Includes cybersecurity features aligned with NERC CIP and BDWE standards.

• Functions as a Phasor Measurement Unit (PMU) with IEEE C37.118 support.

• Supports time synchronization using IEEE 1588.

• Provides fault recording up to 80 s at 8 kHz or 320 s at 2 kHz.

• Includes auxiliary tools for easy testing and commissioning.

SIPROTEC 7SD82

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.