Overcurrent and feeder protection

Overcurrent and feeder protection – SIPROTEC 7SJ82

SIPROTEC 7SJ82

SIPROTEC 7SJ82 overcurrent protection specifically designed for a cost-effective and compact protection of feeders, lines and capacitor banks in medium-voltage and high-voltage systems. 

Overcurrent and feeder protection SIPROTEC 7SJ82

Features & functions

With its flexibility and the powerful DIGSI 5 engineering tool, the SIPROTEC 7SJ82 device offers future-oriented solutions for protection, control, automation, monitoring and PQ basic.

Features

Main function:

  • Feeder and overcurrent protection for all voltage levels

Inputs and outputs:

  • 4 current transformers,
  • 4 voltage transformers (optional),
  • 11 or 23 binary inputs, 
  • 9 or 16 binary outputs, 

or

  • 8 current transformers, 
  • 7 binary inputs, 
  • 7 binary outputs

Hardware flexibility:

  • Different hardware quantity structures for binary inputs and outputs are available in the 1/3 base module. Adding 1/6 expansion modules is not possible; available with large or small display.

Housing width:

  • 1/3 × 19 inches

As standard:

Functions

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

  • Directional and non-directional overcurrent protection with additional functions
  • 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, dir. detection of intermittent ground faults, harmonic detection and admittance measurement
  • Detection of intermittent ground faults with automatic blocking of static measuring functions, to avoid message and fault record flooding
  • Ground fault detection using the pulse detection method
  • Arc protection
  • Overvoltage and undervoltage 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
  • Power protection, configurable as active or reactive power protection
  • Protection functions for capacitor banks, such as overcurrent, overload, current unbalance, peak overvoltage, or differential protection
  • Directional reactive power undervoltage protection (QU protection)
  • Control, synchrocheck and switchgear interlocking protection, circuit-breaker failure protection
  • Circuit-Breaker Failure Protection
  • Circuit breaker reignition monitoring
  • Graphical logic editor to create powerful automation functions in the device
  • 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
  • PQ-Basic: voltage unbalance; voltage changes: overvoltage, dip, interruption; TDD, THD and Harmonics
  • Single-line representation in small or large display
  • Integrated electrical Ethernet RJ45 for DIGSI 5 and IEC 61850 (reporting and GOOSE)
  • 2 optional, pluggable communication modules, usable for different and redundant protocols (IEC 61850-8-1, 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 cybersecurity functionality, such as role-based access control (RBAC), protocolling security-related events, signed firmware or signed firmware or authenticated network access IEEE 802.1X
  • Simple, quick and secure access to the device via a standard Web browser to display all information and diagnostic data, as well as vector diagrams, single-line and device display pages
  • Whitepaper 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

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
  • Protection and monitoring of simple capacitor banks
  • Phasor Measurement Unit (PMU)
  • Reverse-power protection
  • Load shedding applications
  • Automatic switchover
  • Regulation or control of power transformers (two-winding transformers)
  • Acquisition and recording of power quality data in the medium voltage and subordinate low voltage network

 

Benefits

  • Compact and low-cost overcurrent protection
  • Safety due to powerful protection functions
  • Purposeful and easy handling of devices and software thanks to a user-friendly design
  • Cybersecurity to NERC CIP and BDEW Whitepaper requirements (for example, protocolling security-related events and  alarms)
  • Highest availability even under extreme environmental conditions  by “conformal coating“ of electronic boards
  • Full compatibility between IEC 61850 Editions 1, 2.0 and 2.1
Information

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