Multiple winding transformer differential protection
SIPROTEC 5 base module with large display
The SIPROTEC 7UT87 transformer differential protection has been designed specifically for the protection of multi-winding transformers (up to 5 sides). Furthermore, it is to be used where numerous measuring points (up to 9 3-phase current measuring points) are required. Another application is simultaneous protection of two parallel transformers (additional fast backup protection). The SIPROTEC 7UT87 is the main protection for the trans- former 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 cables or lines). With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, SIPROTEC 7UT87 offers future-oriented system solutions with high investment security and low operating costs.
Up to 3 differential protection functions with additional stabilization (in different trans- former function groups); up to 5 ground fault differential protection functions.
For auto transformer applications, two differ- ential protection functions can be processed in an Auto transformer function group.
Usable measuring points:
9 x 3-phase current measuring points, 5 x 1- phase current measuring points, 5 x 3-phase voltage measuring points
Inputs and outputs:
2 predefined standard variants with 20 current transformers, 4 voltage transformers, 15 to27 binary inputs, 22 to 38 binary outputs
Flexibly adjustable and expandable I/O quantity structure within the scope of the SIPROTEC 5 modular system.
Width of housing:
2/3 × 19 inches to 2/1 × 19 inches
Safe and reliable automation and control of your systems
Purposeful and easy handling of devices and software thanks to a user-friendly design
Cyber security in accordance with NERC CIP and BDEW White- paper requirements
Highest availability even under extreme environmental conditions by “conformal coating“ of electronic boards
Powerful communication components warrant safe and effective solutions
High investment security and low operating costs due to future-oriented system solutions
DIGSI 5 permits all functions to be configured and combined as required. In SIPROTEC 7UT87, two transformer function groups can be used.
Transformer differential protection for multi-winding transformers with versatile, additional protection functions (multi-winding transformers are typical in power converter applications (such as HVDC))
Transformer differential protection for phase angle regulating transformers of the single core and two core types, andspecial transformers
Transformer protection applications with up to seven three-phase current measuring points
Simultaneous differential protection for 2 transformers (such as two 2-winding transformers)
Universal usability of the permissible measuring points
Applicable from average up to extra high voltage
Protection of standard power transformers, auto transformers 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
Voltage controller function ANSI 90V for two-winding trans- formers, three-winding transformers and grid coupling trans-formers with parallel control (master/follower, circulating reactive current minimization)
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.
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,IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET IO)
Reliable data transmission via PRP and HSR redundancy protocols
Extensive cyber security functionality, such as role-based access control (RBAC), protocolling security-related events or signed firmware
Simple, quick and secure access to device data via a standard Web browser – without additional software
Secure serial protection data communication, also over great distances and all available physical media (optical fiber, two- wire connections and communication networks)
Capturing operational measured variables and protection function measured values for the evaluation of the system, tosupport commissioning, and to analyze faults
Frequency tracked protection functions over a wide frequency range (10 Hz to 80 Hz) and the option to assign the protection functions in a single device to different frequency tracking groups .
Phasor Measurment Unit (PMU) for synchrophasor measured values and IEEE C37.118 protocol
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
Flexibly adjustable I/O quantity structure within the scope of the SIPROTEC 5 modular system
The SIPROTEC 7UT87 is intended for special applications (up to 5 sides and 7 measuring points), therefore, you must create your own application template depending on the application and store it in the device. To make work easier, you can use an avail- able template and modify it.
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