Transformer Selection for Data Center

Transformer Selection for Data Center

Every data center requires one source from utility power and other from standby generator. Total power requirement of data center dictates selection of transformer. In this article we look into the details of total power requirments and then suggest sizing of transformer which converts voltage from 11KV to 480V AC.

Underestimating the required capacity may result in future power disruptions when forced to increase capacity, and over estimating leads to excessive initial installation costs and higher ongoing maintenance expenses.

  • Power rating of each existing IT rack = Load in VA * 0.67 / 1000
  • Power rating of future anticipated racks = Load in VA * 0.67 / 1000
  • Total Power of device include fire,security and monitoring system = power of other system (other then IT Load ) * 0.67/1000
  • Peak power draw (due to varition in above load) = 1.05 x ( Power rating of each existing IT rack + Power rating of nfuture anticipated racks + total power of device include fire , nnn security and monitoring system )
  • Lightning Load = 0.0215 x data center area in square meter
  • UPS inefficiencies & battery charging = 0.32 x ( Power rating of each existing IT rack + Power rating of future anticipated racks + Total Power of device include fire,security and monitoring system)
  • Total power for load other than cooling = Lightning Load + UPS inefficiencies & battery charging + peak power draw
  • Total power for cooling = Total power for load other than cooling (for DX cooling system)
  • Total power for Load and cooling = Total power for cooling + Total power for load other than cooling
  • Size of transformer = 1.25 x Total Power for Load and cooling

Assessing the electrical power required to support and cool the critical loads within the data center is essential in planning for the development of a facility that will meet the end user’s availability expectations. By employing the process described above, a reasonable estimate of the power requirements can be made. Once the sizing determination is made, conceptual and detailed planning can go forward with the assistance of a competent DCPI systems supplier or, in the case of larger scale data centers, a consulting engineer. Cost estimation can then be made based on the size and reliability configuration determined from the power needs assessment process described above

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