SIPROTEC 7UT86 Transformer Differential Protection


Catalog excerpts

SIPROTEC 7UT86 Transformer Differential Protection - 1

Description The SIPROTEC 7UT86 transformer differential protection has been designed specifically for the protection of three-winding transformers (3 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 cables, lines, shunt reactor). In this process, you are also supported by the modular expandability of the hardware. The device supports all SIPROTEC 5 system characteristics. With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, SIPROTEC 7UT86 offers future-oriented solutions for protection, control, automation, monitoring and PQ basic. Main function 1 differential protection function (standard) with additional stabilization; up to 3 ground fault differential protection functions. For auto transformer applications, two differential protection functions can be processed in an auto transformer function group. Interoperability of SIPROTEC 4 and SIPROTEC 5 line protection devices when using the line differential protection function in the 7UT85, 86, 87 Usable 7 x 3-phase current measuring points, 7 x 1- measuring phase current measuring points, 7 x 3-phase points and 7 x 1 -phase voltage measuring points, ex pandable to 4 sides Inputs and 2 predefined standard variants with outputs 12 current transformers, 4 voltage transform ers, 11 to 23 binary inputs, 18 to 34 binary outputs Hardware Flexibly adjustable and expandable I/O quantity flexibility structure within the scope of the SIPROTEC 5 modular system Housing width 1/2 x 19" - 2/1 x 19" Applications • Protection of special transformers (phase shifter, FACTS and converter transformers, arc furnace transformers, HVDC transformers) • As backup protection for motor and generator differential protection applications SIPROTEC 7UT86 Transformer Differential Protection (1/2 device = standard variant P1) • For the protection of short cables and lines • Voltage control for two- and three-winding transformers with parallel control • As additional line protection function such as distance and line differential protection Functions DIGSI 5 permits all functions to be configured and combined as required. Transformer differential protection for three-winding transformers with versatile, additional protection functions; expandable to 4 sides 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 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 currenttransformer saturation with different degrees of saturation

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SIPROTEC 7UT86 Transformer Differential Protection - 2

Adaptive adaptation of the operate curve to the transformer tap position diagnostic data, as well as vector diagrams, single-line and device display pages • Increased sensitivity with near-neutral-point ground faults through a separate restricted ground fault protection • Point-on-wave switching • Additional current and voltage inputs can be supplements for standard protection functions, such as overcurrent, voltage frequency, etc. • Dynamic Voltage Control (DVC) to adapt the voltage target value via a power direction dependent characteristic curve with strong infeed of regenerative...

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