Siemens Siprotec 5 7SA86 Distance Protection Relay

The SIPROTEC 7SA86 distance protection relay has specifically been designed for the protection of lines. With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, specifically, the SIPROTEC 7SA86 device offers future-oriented system solutions. Additionally, with high investment security and low operating costs.

7SA86 Distance Protection Relay Features

Main function:

• Distance protection
• Interoperability of SIPROTEC 5 and SIPROTEC 4 line protection devices

Tripping:

• 3-pole, minimum tripping time: 9 ms

Inputs and outputs:

12 predefined standard variants with

• 4/4 or 8/8 current transformers/voltage transformers,
• 5 to 31 binary inputs,
• 8 to 46 binary outputs

Hardware quantity structure:

• Flexibly adjustable I/O quantity structure. Specifically, within the scope of the SIPROTEC 5 modular system

Housing width:

• 1/3 × 19 inches to 2/1 × 19 inches

As standard:

• Conformal coating

7SA86 Distance Protection Relay Functions

DIGSI 5 permits all functions to be configured and combined as required.

• Minimum tripping time: 9 ms for ultra-fast fault clearing.
• Supports six independent measuring loops for advanced distance protection.
• Offers multiple distance protection methods: classic, reactance (RMD), and transformer impedance.
• Provides directional backup protection with additional protective functions.
• Detects ground faults in compensated or isolated systems using 3I0>, V0>, transient, cos φ, sin φ, harmonic, and admittance methods.
• Identifies intermittent ground faults through directional detection techniques.
• Uses pulse detection methods for accurate ground-fault location.
• Features adaptive power-swing blocking and out-of-step protection for system stability.
• Detects current-transformer saturation for precise and fast tripping.
• Includes Fault Locator Plus for accurate fault location and targeted reclosing (AREC).
• Provides arc protection to enhance safety and reduce equipment damage.
• Supports automatic load shedding during underfrequency conditions.
• Considers changing the infeed conditions from decentralized generation.
• Includes directional reactive power undervoltage protection (QU).
• Measures signals up to the 50th harmonic for accurate monitoring and protection.
• Supports three-pole automatic reclosing for improved reliability.
• Includes control, synchrocheck, and switchgear interlocking.
• Features a graphical logic editor for advanced automation.
• Displays single-line diagrams on integrated screens.
• Provides Ethernet RJ45 for DIGSI 5 and IEC 61850 communication.
• Supports up to four pluggable modules, specifically, for IEC 61850, IEC 60870-5-103/104, Modbus TCP, DNP3, and PROFINET IO.
• Enables secure communication via fiber, two-wire, and network systems (IEEE C37.94).
• Ensures reliability with PRP and HSR redundancy protocols.
• Includes cybersecurity features such as RBAC and secure firmware.
• Functions as a PMU with IEEE C37.118 support.
• Supports time synchronization via IEEE 1588.
• Offers fault recording up to 80 s (8 kHz) or 320 s (2 kHz).
• Includes testing and commissioning tools with flexible I/O configuration

Applications

• Detection and selective 3-pole tripping of short circuits in electrical equipment of star networks. Similarly, lines with infeed at one or two ends, parallel lines, and open-circuited or closed ring systems of all voltage levels
• Detection of round faults in an isolated. Similarly, or arc-suppression-coil-ground power systems in a star, ring, or meshed arrangement
• Backup protection for differential protection devices of all kinds for lines, transformers, generators, motors, and busbars
• Serial protection communication with SIPROTEC 5 and SIPROTEC 4 devices over different distances and physical media, such as optical fiber, two-wire connections, and communication networks
• Phasor Measurement Unit (PMU)

Benefits

• Safety due to powerful protection functions
• Data security and transparency over the entire lifecycle of the plant, saving time and money
• Purposeful and easy handling of devices and software thanks to a user-friendly design
• Increased reliability and quality of the engineering process
• Cyber security in accordance with NERC CIP and BDEW Whitepaper requirements
• Highest availability even under extreme environmental conditions, specifically,  by “conformal coating“ of electronic boards
• Full compatibility between IEC 61850 Editions 1 and 2
• High investment security and low operating costs due to future-oriented system solutions.

SIPROTEC 5 is part of the new generation of incomparable, specifically, 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.