Siemens Siprotec 5 7SJ85 Overcurrent & Feeder Protection Relay

The Siprotec 7SJ85 Overcurrent & Feeder Relay has been designed specifically for the protection of feeders, lines and capacitor banks. With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, the SIPROTEC 7SJ85 device offers future-oriented system solutions with high investment security and low operating costs.

7SJ85 Overcurrent & Feeder Relay Features

Main function:

• Feeder and overcurrent protection for all voltage levels

Inputs and outputs:

5 predefined standard variants with

• 4 current transformers,
• 4 voltage transformers,
• 11 to 59 binary inputs,
• 9 to 33 binary outputs

Hardware flexibility:

• Flexibly adjustable and expandable I/O quantity structure within the scope of the modular SIPROTEC 5 system; 1/6 expansion modules can be added, available with large or small display, or without display

Housing width:

• 1/3 x 19 inches to 2/1 x 19 inches

As standard:

• Conformal coating

Functions

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

• Directional and non-directional overcurrent protection with additional functions
• Protection of up to 9 feeders with up to 40 analog inputs
• Optimized tripping times due to directional comparison and protection data communication
• Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos ?, sin ?, harmonic, dir. Detection of intermittent ground faults and admittance
• Ground fault detectionusing the pulse detection method
• Fault locator plus for accurate fault location with inhomogenous line sections and targeted automatic overhead-line section reclosing (AREC)
• Arc protection
• Overvoltage and undervoltage protection
• Power protection, configurable as active or reactive power protection
• Frequency protection and frequency change protection for load shedding applications
• Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due to decentralized power generation into consideration
• Protection functions for capacitor banks, such as overcurrent, overload, current unbalance, peak overvoltage, or differential 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 peak overvoltage protection for capacitors) and operational measured values
• Point-on-wave switching
• Control, synchrocheck and switchgear interlocking protection
• Circuit-Breaker Failure Protection
• Circuit breaker reignition monitoring
• Graphical logic editor to create powerful automation functions in the device
• Single-line representation in small or large display
• Fixed 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
• Control of Power Transformers
• 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

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.