Siemens Siprotec 5 7SL82 Line Differential & Distance Protection Relay

The combined line differential and distance protection relay SIPROTEC 7SL82 Distance 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 becomes a practical solution for utilities seeking reliable protection in limited panel space.

Furthermore, with its flexibility and the high-performance DIGSI 5 Engineering Tool, the SIPROTEC 7SL82 fits perfectly for protection, control, monitoring, and measuring applications in electrical energy systems. As a result, engineers can configure and manage the relay efficiently.

Main Function

• Firstly, distance protection for medium-voltage and sub-transmission networks ensures accurate fault detection and system protection.

Tripping

• Additionally, the relay supports 3-pole tripping.

• Moreover, it offers a minimum tripping time of 19 ms, therefore enabling quick fault clearance.

Inputs and Outputs

• The device supports 4 current transformers.

• 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 system control.

Hardware Flexibility

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

• It is not possible to add 1/6 expansion modules.

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

Housing

• Finally, the width of the housing 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.

Functions

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

• Adaptive differential protection ensures high sensitivity and stability during faults.

• Supports distance protection methods such as classic, reactance (RMD), and transformer impedance protection.

• Includes directional backup protection with additional protection functions.

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

• Provides arc protection to improve safety and reduce equipment damage.

• Uses pulse location methods for accurate ground-fault detection.

• Detects current-transformer saturation for fast and precise tripping.

• Includes adaptive power-swing blocking to maintain system stability.

• Supports automatic load shedding during underfrequency events.

• Provides reactive power undervoltage protection (QU protection).

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

• Includes control functions, synchrocheck, and switchgear interlocking.

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

• Displays single-line diagrams on integrated device screens.

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

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

• Enables secure communication via optical fiber, two-wire links, and communication networks.

• Ensures reliability with PRP and HSR redundancy protocols.

• Includes cybersecurity features aligned with NERC CIP standards.

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

• Supports time synchronization through IEEE 1588.

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

• Includes testing and commissioning support tools.

SIPROTEC 7SL82 Distance Protection Relay

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 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.