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Siprotec 7UT85 two winding differential protection relay

Siprotec 7UT85 two winding differential protection relay
Siprotec 7UT85 two winding differential protection relay
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Product Code : SIP26
Brand Name : SIEMENS
Price And Quantity
  • Minimum Order Quantity
  • 1 Piece Piece
Product Description

The transformer differential protection SIPROTEC 7UT85 is a universal protection, control, and automation device on the basis of the SIPROTEC 5 system. It is specially designed for the protection two winding transformers. It is the main protection for the transformer and contains many other protection and monitoring functions. The additional protection functions can also be used as backup protection for protected downstream objects (e.g. cables, line). 

The modular expansion capabilities of the hardware support you here. The device supports all SIPROTEC 5 system characteristics. It enables future-oriented system solutions with high investment security and low operating costs.

Main function:1 Differential protection (standard- or autotransformer) with add-on stabilizations; Up to 2 differential ground-fault protection

Useful measuring point:

  • 5 three-pole current measuring Points,
  • 3 one-pole current measuring points,
  • 3 three-pole voltage measuring Points,
  • 2 one-pole voltage measuring points expandable to 3 sides

Inputs and outputs:

  • 2 predefined standard variants with
  • 8 current transformers,
  • 7 to 19 binary inputs,
  • 7 to 23 binary outputs

Hardware flexibility:Flexible adaptable and expandable I/O quantity structure within the scope of the modular SIPROTEC 5-building blocks

Width of housing:1/3 x 19'' to 2/1 x 19''

All functions can be configured freely with DIGSI 5. For the application of some of the functions, you require the appropriate number of free function points within the device. The function point calculator in the online configurator provides support in determining the required number of function points for your device.

Further Functions

  • Transformer protection for two-winding transformers with versatile additional protection functions expandable to 3 windings
  • Transformer differential protection for single-core phase-shift transformers
  • Universal usability of the admissible measuring points
  • Usable from medium up to extra-high voltage
  • Protection of standard power transformers and auto transformers
  • Increased sensitivity in the case of ground faults close to neutral through a separate ground-fault differential protection
  • Flexible adaptation to the transformer vector group
  • Consideration of inrush and over excitation processes
  • Safe behavior in the case of current transformer saturation with different degrees of saturation
  • Adaptive adjustment of the trip characteristic to the transformer tapping
  • Arc protection
  • Powerful automation with graphical CFC (Continuous Function Chart)
  • Support of single line in small and large displays
  • Integrated electrical Ethernet port J for DIGSI and complete IEC 61850 functionality (reporting and GOOSE)
  • Two optional pluggable communication modules, usable for different and redundant protocols (IEC 61850, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3
  • (serial and TCP)
  • Serial protection data communication via fiber-optic cable, two-wire connections and communication net-works (IEEE C37.94 et al.) including automatic switch between ring and chain topology
  • High available Ethernet redundancy protocols PRP and HSR
  • Cyber Security acc. NERC CIP and BDEW Whitepaper
  • Time synchronization using IEEE 1588
  • Phasor Measurement Unit (PMU) for synchrophasor-measured values and IEEE C37.118 protocol
  • Powerful fault recording
  • Additional functions for simple tests and easy commissioning
Trade Information
  • Main Domestic Market
  • All India


Office No.-9, Plot 53/54, Sector-34, Space Heights, Near Tawa Hotel, Kamothe, Navi Mumbai - 410209, Maharashtra, India
Mr Piyush Lalchand Rathi (Partner)
Mobile :+919819614841, +919769207841
Mr. Dnyanesh Gawande (Partner)
Mobile :+919833686249