AO «EVRAZ NTMK», the town of Nizhny Tagil, Sverdlovsk region.


Upgrading of DC converter and control system for main drive of mill stand in heavy section rolling shop at AO «EVRAZ NTMK».

The specialists of our company have finished the works on upgrading the DC converter and control system for main drive of finisher stand of rolling mill 650 in heavy section rolling shop.

The equipment to be replaced has been in use since 1981 which indicates that it was worn-out and obsolete when it came to upgrading. So the power equipment and cooling system were replaced. The control system was replaced by the modern one based on Sinamics DCM CM converters. Rolled stock length after stand measuring system was implemented too.

Upgrading involved the following major activities:

— development of project for replacement of equipment already in place by the new one including integration with existent systems;

— production and delivery of water-cooled power rectifier units with rated summation current of assemblies — 5000 A;

— production and delivery of control cabinet for rectifier units;

— production and delivery of mill stand motor excitation system converter cabinet;

— production and delivery of heat exchange station for power rectifier units;

— production and delivery of automation cabinet;

— demounting of existent equipment and mounting of the new one;

— connection of equipment to power and water supply systems of the shop;

— commissioning with retention of all existent by the time of upgrading mill stand operating modes.

Construction and mounting and commissioning activities were fulfilled in a short time frame in the course of the shop equipment overhaul works.

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