Siemens Siprotec 5 7UT85 Transformer Differential Protection Relays

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: 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 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
• 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 the 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 and others
• Arc protection
• Voltage controller function ANSI 90V for two-winding transformers, three-winding transformers and grid coupling transformers with parallel control (master/follower, circuit reactive current minimization)
• 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, DNP3 serial and TCP, Modbus TCP, PROFINET IO)
• Redundancy protocols PRP and HSR
• Cyber security to NERC CIP and BDWE Whitepaper requirements
• Secure serial protection data communication, even over great distances and all available physical media (optical fiber cable, 2-wire connections and communication Networks)
• Capturing operational measured variables and protection function measured values to evaluate the plant state, to support commissioning, and to analyze faults
• Phasor Measurement 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

SIPROTEC 5 is part of the new generation of incomparable modular, flexible, and intelligent digital field devices. With modularly designed hardware and software and its high-performance DIGSI 5 engineering tool, the SIPROTEC 5 product family of field devices are perfect for protection, control, monitoring, and measuring applications in electrical energy systems. SIPROTEC 5 offers a wide product range with modular elements for every application and requirement.