SIPROTEC 7UT85 Transformer Differential Protection

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www.siemens.com/siprotec

Description

The SIPROTEC 7UT85 transformer differential protection device is designed specifically for the protection of two-winding transformers (2 sides). 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 subsequent protected objects (such as short cables lines, reactance coil (shunt reactors)). With its modular structure, flexibility, and the high-performance DIGSI 5 engineering tool, SIPROTEC 7UT85 offers future-oriented solutions for protection, control, automation, monitoring, and Power Quality - Basic.

Key Features

Main function

1 differential protection function (standard or auto transformer) with additional stabilization; up to 2 restricted ground-fault protection functions
Interoperability of SIPROTEC 4 and SIPROTEC 5 line protection devices when using the line differential protection function in the 7UT85, 86, 87

Usable measuring points

5 x 3-phase current measuring points, 5 x 1-phase current measuring points, 5 x 3-phase and 5 x 1-phase 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

Flexibly adjustable and expandable I/O quantity structure within the scope of the SIPROTEC 5 modular system

Housing width

1/3 x 19 inch to 2/1 x 19 inch

Applications

Protection of special transformers (phase shifters, FACTS and converter transformers, electric arc furnace transformers, HVDC transformers)
As backup protection for motor and generator differential protection applications
For the protection of short cables and lines
Voltage control for two-winding and three-winding transformers with parallel control
As additional line protection function such as distance and line differential protection

Functions

With the Disconnection of measuring points function, you can disconnect the 1-3ph measuring point from a protection function group. If the measuring point has been disconnected, you can perform any work without influencing the work of the protection functions that have been assigned to the measuring point. After disconnection of the measuring point, the differential protection, for example, stops taking the measured values of this measuring point into account for calculating the differential current. DIGSI 5 permits all functions to be configured and combined as required.

Transformer differential protection for two-winding transformers with versatile, additional protection functions; expandable to 3 windings
Transformer differential protection for phase-angle regulating transformers of the single core type and special transformers
Universal usability of the permissible measuring points
Applicable from average up to extra-high voltage

Modular and flexible

Protection of standard power transformers, auto transformers, short lines, cables, shunt reactors and motors
Typical properties of a transformer differential protection such as flexible adaptation to the transformer vector group, control of inrush 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
Increased sensitivity with near-neutral-point ground faults through a separate restricted ground-fault protection
Additional current and voltage inputs can be supplements for standard protection functions, such as overcurrent, voltage frequency, etc.
Arc protection
Voltage controller function ANSI 90V for two-winding transformers, three-winding transformers and grid coupling transformers with parallel control (master/follower, circulating reactive current minimization)
Dynamic Voltage Control (DVC) to adapt the voltage target value via a power direction dependent characteristic curve with strong infeed of regenerative energies
Graphical logic editor to create powerful automation functions in the device
Up to 4 pluggable communication modules, usable for different and redundant protocols (IEC 61850-8-1, IEC 61850-9-2 Client, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET IO, PROFINET IO S2 redundancy)
Virtual network sharing (IEEE 802.1Q - VLAN)
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, fast 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
Secure serial protection data communication, also over great distances and all available physical media (optical fiber, two wire connections and communication networks)
PQ-Basic: voltage unbalance; voltage changes: overvoltage, dip, interruption; TDD, THD and Harmonics
Capturing operational measured variables and protection function measured values for the evaluation of the systems, to support commissioning, and to analyze faults
Frequency tracked protection functions over a wide frequency range (10 Hz to 90 Hz) and the option to assign the protection functions in a single device to different frequency tracking groups.
Phasor measurement unit (PMU) for synchrophasor measured values and IEEE C37.118 protocol

Benefits

Safety due to powerful protection functions
Purposeful and easy handling of devices and software thanks to a user-friendly design
Highest availability even under extreme environmental conditions by standard coating of the modules
Cybersecurity in accordance with NERC CIP and BDEW Whitepaper requirements
Full compatibility between IEC 61850 Editions 1, 2.0 and 2.1

Siemens

Smart Infrastructure
Digital Grid
Humboldtstrasse 59
90459 Nuremberg, Germany

Customer Support: http://www.siemens.com/csc

For the U.S. published by Siemens Industry Inc.

100 Technology Drive
Alpharetta, GA 30005
United States

Siemens 2020. Subject to changes and errors.
SIPROTEC 7UT85_Profile V1.docx_12.20

For all products using security features of OpenSSL, the following shall apply: This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (www.openssl.org), cryptographic software written by Eric Young (eay@cryptsoft.com) and software developed by Bodo Moeller.

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