dok_DC-Datacenter_+e_120522_ny.docx

Efficient DC power supply in data centerData centers consume about 100 times more power than an office building of the same size. Valuable electrical energy is lost in the individual components when alternating current is converted into direct current and vice-versa. n a pro!ect for the "C service provider #reen$ %&& shows how a DC power supplycan help a data center cut energy consumption by 10 to '0 percent.Data centers consume vast amounts of energy every year. Size for size they consume around 100 times the power used to run the average office building. In total that is a staggering 80 million megawatt hours of electricity a year, representing nearly! of the global "#

emissions.$ows of servers storing trillions of megabytes of information operate around the cloc% to enable organizations to run applications, process information and automate their operations. &t home they allow you to upload a video, play a game, share a photo, e'mail a friend, tweetyour location or chec% your ban% balance.(ith the addition of more than ),*) million new servers every year, worldwide carbon emissions from data centers will +uadruple by 00. #n average, one data center uses the e+uivalent power of ),000 homes in the western world and together they produce "#

emissions that are fast approaching the levels generated by countries such as &rgentina or the -etherlands.Significant amounts of energy can be saved through improvements to data center e+uipment, facility design and management, and &.. provides a wealth of e/pertise, engineering, products and support to not only help today,s data centers operate more efficiently but also to operate safely and more reliably.

(ith reported data center outages costing 1 million 0SD or more per hour, uptime is critical, particularly for ban%ing and financial institutions. 1herefore unplanned outages have to be reduced, service +uality improved and energy saved.(educed energy consumption than)s to DC power supply"omputer systems and associated components such as telecommunications and storage systems operate on direct current 2D"3, yet the grid'supplied power coming into data centersis alternative current 2&"3. 1hat is why each device needs its own power supply unit to be connected to the &" power grid. 1his arrangement results in cumulative conversion losses and waste heat, which must be offset with cooling. &n obvious alternative for a data center operating a multitude of servers would be to have a separate D" feed to power this e+uipment directly.D" power technology saves a considerable amount of energy in electrical power distribution compared to conventional &" power technology. & D" solution can also deliver better energy efficiency in data centers than &" power systems because it reduces energy conversion losses by at least 10 percent. 4ess cooling is also re+uired in the I1 room, which further cuts energy needs.1he costs of power engineering e+uipment, installation, operation and maintenance are li%ewise reduced. 5oreover, D" power systems are less comple/ and need less space and e+uipment, thus cutting real estate and other investments substantially. 1he total facility costs can be decreased by up to 60 percent as a result.1he advantages of D" power systems in data centers at a glance7' 10 percent better energy efficiency 2not counting the reduced need for cooling in the I1 room3 ' 1) percent lower investment costs' ) percent less space re+uired' 0 percent lower installation costs' Improved reliability' $educed operating and maintenance e/penses*ilot plant at #reen in +witzerland&.. fitted the data center in 4upfig in the Swiss canton of &argau with a D" power distribution system throughout, ma%ing it the first data center in the world to be so e+uipped. In a showcase pro8ect, about 1100 s+uare meters of 9reen,s new data center was furnished with an innovative D" power supply featuring a completely redundant design and an output of about one megawatt. 4ow :oltage Systems, a local business unit of &.. Switzerland, implemented, supplied and installed this groundbrea%ing solution in collaboration with :alidus D" Systems, a leading supplier of e+uipment for D" power infrastructure for data centers in the &.. 9roup. 1he solution meets the specifications of the International ;lectrotechnical "ommission 2I;"3 that apply in most countries of the world.9$;;-."< is a leading I1" service provider for Internetbased data communication and security in Switzerland. 1he company has four data centers, the most modern of which is in 4upfig. =nown for stringent ecological standards, 9reen agreed immediately to be part of this pilot pro8ect of &.. as a way of operating its data center with greater efficiency and less energy.>igure comparing &" and D"7 (educed direct current architecture?rior to this pro8ect, servers were supplied with electrical energy in an alternating current system via medium'voltage transformers, &" switchgear, a battery'supported uninterruptible power supply 20?S3, &" power distribution units and &" power supply units. 1he following simplified architecture is now planned for the new direct current power supply7 1he local power utility feeds power in at a level of 1@ %: to gas'insulated medium'voltage switchgear of the type &.. AB0. In case of a grid outage, an emergency power system also feeds power to this switchgear following an automatic changeover by the control system.1he rectifier unit consists of a medium'voltage switch, a highly efficient transformer and the actual rectifier. It transforms the 1@ %: alternating voltage immediately thereafter into C00 : direct current and ultimately sends it to the servers without any further transformation 2simplified D" power supply units supply the servers with the power they need3. 1he rectifier employs highly efficient power electronics with semiconductors that have proven themselvesin industrial practice, li%e the ones produced at the &.. factory in 4enzburg . .atteries with an autonomous operation time of 10 minutes are used for bridging the time from the grid failure to power being supplied by the emergency power system. 1hey too are connected to the rectifier unit merely via diodes and without any further conversion. %&& as a pioneer in direct current technology1his approach of feeding the data center directly from a D" power supply is a revolutionary step for &.. into a more energy efficient future. 5ichael 9abriel, head of the local business unit for low'voltage products in 4enzburg that implemented the pro8ect, is optimistic about the pilot pro8ect7 D(e hope the findings from this pilot pro8ect will persuade as many top server producers as possible of the advantages of D" power technology.E1ara% 5ehta, head of &..,s global 4ow :oltage ?roducts division, also sees promising mar%et opportunities in direct current power supplies7 D(ith this approach, we present a top technical solution that has a number of advantages. .ut it will be the customers who decide whether it becomes established.E,or further information$ please contact-&ndrF SchGrer:ice ?resident 9lobal Data "enter Segment 5anager&.. Switzerland 4td.4enzburg, Switzerland?hone7 HC1 *I )I I@ 10andre.schaererJch.abb.comThe low voltage DC main distribution board at the DC datacenter of Lupfg.The Emergency diesel generator set with generator breaker type A Ema!"enerator breaker type A Ema! with control system type A Tanomat #backgorund$