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Product Code : SIP27
Brand Name : SIEMENS
Product Description

The transformer differential protection SIPROTEC 7UT86 is a universal protection, control, and automation device on the basis of the SIPROTEC 5 system. It is especially designed for the protection of three winding transformers. It is the main protection for the transformers 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). At this, it supports also the modular availability of the hardware. 

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) with add-on stabilizations; Up to 3 differential ground-fault protection For autotransformer applications 2 differential protection functions in a function group, autotransformer can be used.

Useful measuring point:

  • 6 three-pole current measuring Points,
  • 4 one-pole current measuring points,
  • 3 four-pole voltage measuring Points,
  • 3 one-pole voltage measuring points
  • expandable to 4 sides

Inputs and outputs:

  • 2 predefined standard variants with
  • 12 current transformers,
  • 4 voltage transformers
  • 11 to 23 binary inputs,
  • 18 to 34 binary outputs

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


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