Abstract
The use of three-phase power distribution allows for simplifying hardware installation, achieving
higher efficiency, and reducing energy costs. A comprehensive three-phase power infrastructure
involves both rack-level (intra-rack) and row-level (inter-rack) solutions. This paper discusses the latest
trends in zoned (end-of-row) power distribution and describes HP solutions that provide customers with
a complete and efficient solution for three-phase power distribution.
Introduction
An enterprise data facility contains a large amount of IT equipment with substantial power
requirements. Energy usage has increased to the point that it is second only to labor in operating
costs for some large facilities. Increased server densities and subsequent rise in power demands on a
per-rack basis make it crucial to interface and balance the electrical load properly with facility power
to ensure safe and cost-efficient operation.
Power distribution in data centers
The typical data center uses power that originates from the utility power grid and is stepped down to
the appropriate range by the building transformer. Power within the data center can be distributed
using either a centralized or distributed infrastructure. Centralized systems provide utility or backup
power to IT equipment from a single distribution point that includes the alternating current (AC)
switchgear, uninterruptible power supplies (UPSs), and power distribution panels. This paper
describes a distributed (zoned) system (Figure 1) where utility or generator power from the AC
switchgear is distributed among equipment groups or rows. In a zoned system, each IT equipment
row includes its own UPS/power distribution infrastructure.
Figure 1
.
Data center using zoned power distribution
Building
transformer
AC
switchgear
Building
generator
IT Equipment racks
UPS
rack
Utility
power grid
Cooling
Equipment
Power
Distribution
Rack
2
