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Personal Brand Statement:
As an Army veteran dedicated to lifelong learning, I bring a disciplined, strategic mindset to my pursuits. I am constantly expanding my knowledge to innovate and lead effectively. My journey is driven by a commitment to excellence, and to make a meaningful impact in the world.
Tata Group Dials Taiwan for Its Chipmaking Ambition in Gujarat’s DholeraAvirahi City Dholera
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Visit : https://www.avirahi.com/blog/tata-group-dials-taiwan-for-its-chipmaking-ambition-in-gujarats-dholera/
B2B payments are rapidly changing. Find out the 5 key questions you need to be asking yourself to be sure you are mastering B2B payments today. Learn more at www.BlueSnap.com.
buy old yahoo accounts buy yahoo accountsSusan Laney
As a business owner, I understand the importance of having a strong online presence and leveraging various digital platforms to reach and engage with your target audience. One often overlooked yet highly valuable asset in this regard is the humble Yahoo account. While many may perceive Yahoo as a relic of the past, the truth is that these accounts still hold immense potential for businesses of all sizes.
At Techbox Square, in Singapore, we're not just creative web designers and developers, we're the driving force behind your brand identity. Contact us today.
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https://www.hubspot.com/state-of-marketing
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ChatGPT is a revolutionary addition to the world since its introduction in 2022. A big shift in the sector of information gathering and processing happened because of this chatbot. What is the story of ChatGPT? How is the bot responding to prompts and generating contents? Swipe through these slides prepared by Expeed Software, a web development company regarding the development and technical intricacies of ChatGPT!
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WP17 UPS and Surge Terms
1. Understanding Power Factor,
Crest Factor, and Surge Factor
White Paper 17
Revision 1
by Neil Rasmussen
Contents
> Executive summary Click on a section to jump to it
Introduction 2
This white paper explains the technical terms of power
factor, crest factor, and surge factor. The use of these Power factor 2
terms in specifying UPS is explained.
Crest factor 3
Surge factor 4
Conclusion 5
Resources 6
2. Understanding Power Factor, Crest Factor, and Surge Factor
Introduction The terms power factor, crest factor, and surge factor refer to completely different and
unrelated phenomena. These characteristics are often specified for UPS systems, and
customers will sometimes place them in specifications.
Power factor Power factor is a quantity which has important implications when sizing a UPS system and
power distribution equipment. Power is a measure of the delivery rate of energy and in DC
(direct current) electrical circuits is expressed as the mathematical product of Volts and Amps
(Power = Volts x Amps). However, in AC (alternating current) power system, a complication
is introduced; namely that some AC current (Amps) may flow into and back out of the load
without delivering energy. This current, called reactive or harmonic current, gives rise to an
“apparent” power (Volt x Amps) which is larger than the actual power consumed. This
difference between the apparent power and the actual power gives rise to the power factor.
The power factor is equal to the ratio of the actual power to the apparent power. The
apparent power is expressed as the Volt-Amp or VA rating. Therefore, the actual power in
any AC system is the VA rating multiplied by the power factor.
For many types of electrical equipment the difference between apparent power (VA) and
actual power (Watts) is very slight and can be ignored, but for some computers the difference
is very large and important. Many desktop personal computers present a nonlinear load to
the AC supply. This is because they have a power supply design known as a "capacitor input
switch mode power supply". In a study done by PC Magazine, it was found that typical
personal computer systems exhibit a power factor of .65 which means that the apparent
power (VA) was 50% larger than the actual power (Watts)!
Information technology (IT) equipment including servers, routers, hubs, and storage systems
almost universally use a different power supply design known as "Power Factor Corrected".
These devices present a very linear load to the AC supply and do not generate harmonic
currents. In fact they are one of the cleanest loads on the power grid and generate less
harmonic current than many other devices such as fluorescent lighting or variable speed
motors. Ten years ago, these devices were nonlinear loads like personal computers, but
today all of these loads are subject to international regulation IEC 1000-3-2 which require
them to be made with the "Power Factor Corrected" design.
Sizing a UPS
To size a UPS and ensure that the UPS output capacity is sufficient, both the VA rating and
the Watt rating of the load are important. The watt rating of the UPS relates to the amount of
power it can deliver, and the VA rating of the UPS relates to the amount of current it can
deliver. Neither the Watt nor the VA rating of the UPS can be exceeded. In practice, the best
approach is to size a UPS the Watt rating of the load. This is particularly true for larger IT
installations where the power factors of the loads are nearly 1. If there is confusion regarding
power ratings or power factor, and it is desirable to ensure the load can be powered by the
UPS, then choosing a UPS with a Watt rating greater than or equal to the VA rating of the
load will always ensure a safety margin.
Power factor has an important implication in the specification of UPS run time on battery.
Battery run time is dictated by the watt load on the UPS. However, when many UPS manu-
facturers specify run time at full load they are referring to full VA load, not the full watt load.
For example, a UPS rated at 10,000 VA may be rated for 20 minutes of run time at full load.
In the fine print it notes that this full load is at a .65 power factor. Therefore the load for the
run time specification is really only 6500 Watts. The same UPS may have a 9000 W rating.
APC by Schneider Electric White Paper 17 Rev 1 2
3. Understanding Power Factor, Crest Factor, and Surge Factor
This means that the run time was provided at 6500/9000 or 72% of the full load watt rating of
the UPS. At 72% of the Watt rating the UPS may run almost 70% longer than at the real full
load Watt rating. So this UPS which claimed to have 20 minutes of run time may only provide
12 minutes of run time at the true full load Watt rating. To overcome this confusion, always
make sure run time specifications are based on Watt loads, and not VA loads.
Manufacturers of smaller desktop UPS often only include VA specifications for their UPS
products. When the Watt rating of a UPS is not furnished, it can be very difficult to determine
if the UPS is capable of supplying a specific load. Lower cost UPS products often have a
Watt rating of 50% of the nameplate VA rating. This can cause confusion, for example a
1000 VA UPS that will not run a 600 W load (the Watt load rating is either not provided or in
the fine print and in reality is only 500 W).
Link to resource
In addition to their contribution to power factor, harmonics have other implications in power
APC White Paper 26
system design. These are discussed in detail in APC White Paper 26, Hazards of Harmonics
Hazards of Harmonics and and Neutral Overloads.
Neutral Overloads
Crest factor In addition to a low power factor, some computer loads are also unusual in that they exhibit a
very high crest factor. Crest factor is the ratio between the instantaneous peak current
required by the load and the RMS current (RMS stands for Root Mean Square, which is a
type of average). Most common electrical appliances exhibit a crest factor of 1.4 (1.4 is the
ratio of the peak value of a sine wave to its RMS value). Computers and IT equipment with
Power Factor Corrected power supplies exhibit a crest factor of 1.4. Personal computers and
stackable hubs exhibit a crest factor of 2 to 3.
When a load exhibits a crest factor of more than 1.4, the source (UPS) must supply the peak
current desired by the load. If the source does not supply the current, then the source
voltage will become deformed (distorted) by the excess peak current. Therefore, if a UPS is
not sized to supply the crest factor desired by the load, the output voltage waveform of the
UPS will be distorted.
The crest factor requirement of a computer load will vary depending on the source which it is
supplied from. The crest factor may even vary when the computer load is moved from one
AC receptacle to another in the same room. It is widely believed that the crest factor is an
inherent characteristic of a computer load, when in fact crest factor results from an interaction
between the load and the AC source. The crest factor required by a computer load depends
on the AC source waveform. For a sine wave source, a non-power factor corrected personal
computer will typically exhibit a crest factor of 2 to 3. For a source waveform which is a
stepped approximation to a sine wave, as used in most UPS below 1 kW, a computer will
exhibit a crest factor of 1.4 to 1.9.
It is widely but mistakenly believed that it is desirable to operate a computer at as high a crest
factor as possible. In fact, computer manufacturers go to great lengths to reduce the crest
factor of the computer because high crest factor causes overheating of power supply
components.
The reduction in crest factor which occurs when a computer load is operated from a UPS,
surge suppressor, or power conditioner is a positive side benefit, except if the reduction is
accompanied by excessive distortion of the input voltage waveform to the computer load.
Such distortion may result in a significantly reduced peak voltage being supplied to the load,
which is equivalent to a brownout condition. The UPS or line conditioner must be designed to
maintain the proper peak voltage.
Typical sine wave UPS systems such as the APC by Schneider Electric Symmetra or Smart-
UPS models have a crest factor capability of approximately 3 when operated at full load, 4
APC by Schneider Electric White Paper 17 Rev 1 3
4. Understanding Power Factor, Crest Factor, and Surge Factor
when operated at 1/2 load, and 8 when operated at 1/4 load. Typical smaller stepped wave
models such as the APC Back-UPS have a crest factor capability of 1.6 at full load and 2 at
1/2 load. UPS systems with this performance will maintain the proper peak voltage into the
computer load for computers with any input crest factor specification.
Lower quality UPS systems on the market have limited peak output current capability and
consequently low crest factor performance and will distort the output voltage under personal
computer loads. Typically this does not cause a malfunction with smaller PC installations.
However in large multi-PC installations such as call centers can cause significant degradation
of the UPS output waveform. In these cases it is not uncommon to see a UPS output
waveform that is nearly a square-wave. This situation can cause various types of office
machines to malfunction.
The fact that virtually all equipment installed in data centers today such as servers, routers,
and storage devices are power factor corrected has virtually eliminated crest factor as a
problem in the data center. Crest factor problems today are limited to call center or trading
floor installations with a high density of personal computers.
Surge factor This term is often mistakenly related to the surge suppression characteristic of a UPS or
surge suppressor, which is a different and unrelated characteristic. Surge factor relates to
the momentary overload capacity of the UPS and is a measure of the ability of the UPS to
start-up loads which temporarily require extra power when they start-up. Examples of loads
which have a high surge factor requirement include motors, compressors, and to a lesser
extent disk drives.
For typical computer systems with hard disk drives, the surge factor required is approximately
1.15 times the steady-state power consumption. For large disk arrays, the surge factor
required can be approximately 1.5 times the steady-state power consumption.
APC by Schneider Electric White Paper 17 Rev 1 4
5. Understanding Power Factor, Crest Factor, and Surge Factor
Conclusion Most UPS systems today have sufficient crest factor and surge factor to meet virtually any
requirement in a data room or data center. Therefore, their use in bid specifications is
relatively unimportant.
Power factor remains a misunderstood subject, and ignoring or misapplying the power factor
concepts can result in a number of problems, including: overestimation of UPS run time;
incorrect comparison of run time between competitive products, and under sizing of UPS
systems. The guidelines and warnings regarding power factor that are summarized in this
paper can prevent these misunderstandings.
About the author
Neil Rasmussen is the Senior VP of Innovation for APC, which is the IT Business Unit of
Schneider Electric. He establishes the technology direction for the world’s largest R&D budget
devoted to power, cooling, and rack infrastructure for critical networks.
Neil holds 14 patents related to high efficiency and high density data center power and cooling
infrastructure, and has published over 50 white papers related to power and cooling systems,
many published in more than 10 languages, most recently with a focus on the improvement of
energy efficiency. He is an internationally recognized keynote speaker on the subject of high
efficiency data centers. Neil is currently working to advance the science of high-efficiency,
high-density, scalable data center infrastructure solutions and is a principal architect of the APC
InfraStruXure system.
Prior to founding APC in 1981, Neil received his bachelors and masters degrees from MIT in
electrical engineering, where he did his thesis on the analysis of a 200MW power supply for a
tokamak fusion reactor. From 1979 to 1981 he worked at MIT Lincoln Laboratories on flywheel
energy storage systems and solar electric power systems.
APC by Schneider Electric White Paper 17 Rev 1 5
6. Understanding Power Factor, Crest Factor, and Surge Factor
Resources
Click on icon to link to resource
Hazards of Harmonics and Neutral Overloads
APC White Paper 26
APC White Paper Library
whitepapers.apc.com
APC TradeOff Tools™
tools.apc.com
Contact us
For feedback and comments about the content of this white paper:
Data Center Science Center, APC by Schneider Electric
DCSC@Schneider-Electric.com
If you are a customer and have questions specific to your data center project:
Contact your APC by Schneider Electric representative
APC by Schneider Electric White Paper 17 Rev 1 6