Distance protection – SIPROTEC 7SA82

Distance protection – SIPROTEC 7SA82

SIPROTEC 7SA82 distance protection for cost-optimized and compact protection of lines in medium-voltage and high-voltage systems.

Distance protection – SIPROTEC 7SA82

Main function:

  • Distance protection for medium-voltage and high voltage applications
  • Interoperability of SIPROTEC 5 and SIPROTEC 4 line protection devices

Tripping:

  • 3-pole, minimum tripping time: 19 ms

Inputs and outputs:

  • 4 current transformers,
  • 4 voltage transformers,
  • 11 or 23 binary inputs,
  • 9 or 16 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.

Width of housing:

  • 1/3 x 19 inches

As standard:

  • Conformal coating

Functions

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

  • Minimum tripping time: 19 ms
  • 6 independent measuring loops (6-system distance protection)
  • Several distance-protection functions can be selected: Classic, reactance method (RMD), impedance protection for transformers
  • 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, dir. Detection of intermittent ground faults, harmonic detection and admittance measurement
  • Ground fault detection using the pulse detection method
  • Adaptive power-swing blocking
  • 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
  • PQ-Basic: voltage unbalance; voltage changes: overvoltage, dip, interruption; TDD, THD and Harmonics
  • Ground fault detection using the pulse detection method
  • 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)
  • 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 authenticated network access IEEE 802.1X
  • Simple, quick and secure access to device data via a standard Web browser to display all information and diagnostic data, as well as vector diagrams, single-line and device display pages
  • 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

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)
  • Acquisition and recording of power quality data in the medium voltage and subordinate low voltage network.

Benefits

  • Compact and low-cost distance protection
  • Safety due to powerful protection functions
  • Purposeful and easy handling of devices and software thanks to a user-friendly design
  • Cybersecurity in accordance with NERC CIP and BDEW Whitepaper requirements
  • 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
  • High investment security and low operating costs due to future-oriented system solutions

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