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, the SIPROTEC 7SA86 device offers future-oriented system solutions 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 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
• 6 independent measuring loops (6-system distance protection)
• Several distance-protection functions can be selected: Classic, reactance method (RMD), impedance protection for tranformers
• Directional backup protection and various additional functions
• Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos φ, sin φ, harmonic, dir. Detection of intermittent ground faults and admittance
• Ground fault detectionusing the pulse detection method
• Adaptive power-swing blocking, out-of-step protection
• Detection of current-transformer saturation for fast tripping with high accuracy
• Fault locator Plus for accurate fault location with inhomogenous line sections and targeted automatic overhead line section reclosing (AREC)
• Arc protection
• Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due to decentralized power generation into consideration
• Power protection, configurable as active or reactive power protection
• Directional 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
• 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 pluggable communication modules, usable for different and redundant protocols (IEC 61850-8-1, IEC 61850-9-2Client, IEC 61850-9-2 Merging Unit, 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  (IEEE C37.94,and others), including automatic switchover between ring and chain topology
• Reliable data transmission via PRP and HSR redundancy protocols
• Extensive cyber securityfunctionality, such as role-based access control (RBAC), protocolling security-related events or signed firmware
• Simple, quick and secure access to device data via a standard Web browser – without additional software
• 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 simple tests and commissioning
• Flexibly adjustable I/O quantity structure within the scope of the SIPROTEC 5 modular system

Applications

• Detection and selective 3-pole tripping of short circuits in electrical equipment of star networks, lines with infeed at one or two ends, parallel lines and open-circuited or closed ring systems of all voltage levels
• Detection of ground faults in isolated or arc-suppression-coil-ground power systems in star, ring, or meshed arrangement
• Backup protection for differential protection devices of all kind 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 securityin accordance with NERC CIP and BDEW Whitepaper requirements
• Highest availability even under extreme environmental conditions  by “conformal coating“ of electronic boards
• Powerful communication components warrant safe and effective solutions
• 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 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.