Three winding transformer differential protection
SIPROTEC 5 base module with large display
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 modular availablility 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.
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.
Useable 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 pointsexpandable 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
Flexible adaptable and expandable I/O-quantity structure within the scope of the modular SIPROTEC 5-building blocksbuilding blocks
Width of housing:
1/3 x 19'' to 2/1 x 19''
High-performance protection features guarantee safety
Data security and transparency throughout the entire life cycle of the system save time and reduce costs
Clear and easy-to-use devices and software thanks to user-friendly design
Increased quality and reliability of the engineering process
High degree of overall safety and security based on thor-ough implementation
High-performance communications components guar-antee safe and effective solutions
Full compatibility with IEC 61850 Edition 1 and 2
High available Ethernet communication though integrated Ethernet Redundancy Protocols PRP and HSR
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.
Transformer protection for three-winding transformers with versatile additional protection functions; expandable to threewinding transformer
Transformer differential protection for single-core phase-shift transformers and special transformers
Universal usability of the admissible measuring points
Protection of standard power transformers, autotransformers, and motors
Usable from medium up to extra-high voltage
Protection of standard power transformers and autotransformers
ANSI 90 V voltage control function for two-winding transformers, three-winding transformers and system coupling transformers
Typical properties of a transformer differential protection such as 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
Increased sensitivity in the case of ground faults close to neutral through a separate ground fault differential protection
Further current and voltage inputs can be added for standard protection functions such as overcurrent, voltage, frequency, etc.
Up to 4 pluggable communication modules usable for different and redundant protocols (IEC 61850, IEC 60870-5-103, IEC 60870-5-104, DNP3 (serial+TCP), Modbus TCP)
Ethernet redundancy protocols PRP and HSR
Cyber Security in accordance with NERC CIP and BDEW whitepaper
Powerful automation with CFC (Continuous Function Chart)
Safe serial protection data communication also across large distances and all available physical media (fiber optic, two-wire connections and communication networks)
Measurement of operating variables
Phasor Measurement Unit (PMU) for synchrophasor-measured values and IEEE C37.118 protocol
Powerful fault recording
Help functions for simple tests and easy commissioning
Application templates are available in DIGSI for standard applications. They comprise all basic configurations and default settings. You can use them directly or as a template for application-specific adaptations.
The application templates for 7UT85 are also available in 7UT86.
In addition, The following application templates are available:
Differential protection (default setting for Ydxdy)
Differential protection for complete transformer (auto transformer + delta winding)
Differential ground-fault protection (neutral point + max side current)
Overload protection, backup protection for the downstreamed power system
Circuit-breaker failure protection
Differential protection (default setting for YNdxdy)
Differential ground-fault protection on the neutral side
Ground current-protection on the neutral side as backup protection for power systems
Frequency- and voltage protection on the star winding side
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