Siemens 7UT86 Transformer

Product manual:

Siemens 7UT86 is a transformer protection relay mainly used for the protection of transformers, reactors, and long lines in power systems.
It is based on digital relay technology and can provide high-precision differential protection, overcurrent protection, and other additional functions to ensure the safe operation of transformers.
Main functional features
Differential protection (87T): uses the comparison of current on both sides of the transformer to detect internal faults, with high sensitivity and fast action characteristics.
Overcurrent protection (50/51): detects short circuits and overloads to prevent equipment damage.
Excitation inrush current suppression: It can distinguish between normal excitation inrush current and actual fault current to avoid misoperation.
Zero sequence protection (87N, 50N/51N): used to detect grounding faults and improve system safety.
Overload protection (49): Monitor transformer load to prevent overheating and damage.
Remote communication and monitoring: supports multiple communication protocols (such as IEC 61850),
Can be integrated with SCADA or DCS systems to achieve remote monitoring.
application area
High voltage/ultra-high voltage substations: provide comprehensive protection for large power transformers,
Prevent internal short circuits, winding faults, and other issues.
Industrial power grid: a large-scale substation system used in industries such as steel, chemical, and petroleum to ensure the stable operation of power equipment.
Renewable energy: In new energy scenarios such as wind power and photovoltaics,
Provide protection for the step-up transformer to ensure the reliability of power transmission.
Siemens 7UT86, with its high-precision protection function and powerful communication capability,
Widely used in modern power systems and industrial distribution systems.

Product details picture:

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