Power supply

When designing the electrical supply for the Digitalis data center, we applied a non-standard approach. We did not look at the data center as one indivisible whole with one consumption, but we focused individually on individual servers, racks and aisles.

Thanks to a new perspective, we have created a unique solution with higher reliability with the same redundancy. At the same time, the solution has a better ratio between the installed power and the usable power of the electrical system equipment. Reliability with N+1 redundancy is enhanced by having all generators and UPSs run at less than maximum power during any power outage, while with the "N+standby" concept, N devices run at full power and the standby is not running. In both cases, the N+1 concept applies, where if any branch fails, the remaining branches will take over its performance without interruption.

Digitalis power supply:

• Each of the four branches is powered by its own transformer, and has its own backup generator and UPS with N+1 modules.
• The branches are in 3+1 redundancy, and are connected using a "multiple feed" system, which means that all branches are always used equally (if one branch fails, there is no switching of the central elements of the power supply going on, as the power transfer occurs at the level of server racks).
• Each row of racks is powered by a combination of 2 electrical branches. Therefore, each hall has exactly 9 rows of seagulls.
• In case of failure of one of the branches, the load is distributed evenly on each remaining branch with 1/3 of its power.
• There are no active elements between the UPS and the branch in the row of racks - possible points of failure.
• Above each rack is a busbar from which power is supplied to the PDU in the rack.
• Each server has its own electricity consumption meter with a direct connection to VNET's information system. The customer gets a unique opportunity to check consumption through the VNET customer zone after 15-minute intervals.