Transformer differential protection – SIPROTEC 7UT82

Transformer differential protection – SIPROTEC 7UT82

The SIPROTEC 7UT82 transformer differential protection has been designed specifically for the protection of two-winding transformers.

Transformer differential protection – SIPROTEC 7UT82

Main function:

  • 1 differential protection function (standard or auto transformer) with additional stabilization; up to 2 restricted ground-fault protection functions

Usable measuring Points:

  • 2 x 3-phase current measuring points,
  • 2 x 1- phase current measuring points

Inputs and outputs:

1 predefined standard variant with

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

Hardware flexibility:

  • The 1/3 base module is available with the IO103 module; it is not possible to add 1/6 expansion modules, available with large and small display

Width of housing:

  • 1/3 × 19 inches

As standard:

  • Conformal coating

Functions

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

  • Transformer differential protection for two-winding transformers with versatile, additional protection functions
  • Transformer differential protection for phase-angle regulating transformers of the single core type
  • Universal usability of the permissible measuring points
  • Applicable from average up to extra-high voltage
  • Protection of standard power transformers, auto transformers, short lines, cables, longitudinal and shunt reactors, as well as motors
  • Increased sensitivity with near-neutral-point ground faults through a separate restricted ground-fault protection
  • Flexible adaptation to the transformer vector group
  • Controlling closing and overexcitation processes
  • Safe behavior in case of current-transformer saturation with different degrees of saturation
  • Adaptive adaptation of the operate curve to the transformer tap position
  • Arc 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 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
  • PQ-Basic: voltage unbalance; voltage changes: overvoltage, dip, interruption; TDD, THD and Harmonics
  • 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 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
  • 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

  • Protection of special transformers (phase shifter, FACTS and converter transformers, arc furnace transformers, HVDC transformers)
  • Backup protection for motor and generator differential protection applications
  • For protection of short cables and lines

Benefits

  • Compact and low-cost transformer differential protection
  • 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 security in 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

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