SIPROTEC 7UT87 Transformer Protection

The SIPROTEC 7UT87 transformer differential protection has been designed specifically for the protection of multiwinding transformers (up to 5 sides). Furthermore, it is to be used where numerous measuring points (up to 7 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 transformer and contains many other protection and monitoring functions. The additional protection functions can also be used as backup protection for protected downstream 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.

Main function: Up to 3 differential protection functions with additional stabilization (in different transformer function groups); up to 5 ground fault differential protection functions. For auto transformer applications, two differential protection functions can be processed in an auto transformer function group. Usable measuring point: 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 to 27 binary inputs, 22 to 38 binary outputs Hardware flexibility: Flexibly adjustable and expandable I/O quantity structure within the scope of the SIPROTEC 5 modular system. Housing width: 2/3 × 19" - 2/1 × 19"