Siemens Siprotec 5 7SJ85 Overcurrent & Feeder Protection Relay
Description
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 φ, sin φ, 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
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.
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