Generally, large industrial site designs use standard specifications of the HV/MV transformer which leads to oversizing and a higher cost of the MV primary and secondary electrical distribution system.

This paper introduces the factors to consider when specifying the HV/MV transformer and raises awareness of the impact of short circuit impedance (zt) on the cost of the HV/MV transformer and the MV electrical distribution installation (MV switchgear and cabling). Finally, a case study of a large date center is presented to show how a reduction in the total cost of ownership (TCO) can be achieved.

NOTE: this technical white paper is aimed at electrical engineers who are specifying HV/MV transformers for large industrial and data center sites.