Transcript Destruction

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© 2001 POWERVAR, Inc.
POWER VIRUSES
Preventing
Electronic Influenza
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Session Objectives
 Define
basic power quality disturbances
 Identify basic steps in providing quality
power
 Discuss ramifications of power
problems
 Outline preventative measures
 Discuss the benefits of clean power
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We’ve all had a virus . . . .
 The
common cold, flu, or other virus
related illness affect humans everyday.
 The effects of a virus range from merely
annoying to deadly.
 Viruses enter our body unseen and
announce their presence only after the
damage has begun.
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Viruses affect software . . . .
 The
computer industry discovered that
similar problems can affect software.
 Unwanted, malicious programs attach
themselves to regular computer
instructions.
 The damage they cause ranges from
annoying to disastrous.
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We’re familiar with the idea . . .
 Because
we’re familiar with how our
bodies react to organic viruses, the
computer industry labeled these
unwanted software programs as
“software viruses.”
 They hope our familiarity will cause us
to exercise caution using software and
to take time to do regular backups.
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We’re familiar with viruses . . .
 Once
infected, the damage has begun.
 The virus must run its course, either
delaying, debilitating or destroying its
victim.
 Where viruses are concerned -- there is
no cure. There is only prevention.
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A New Kind of Virus
 Power
quality problems can affect
computer systems, too.
 These problems are so much like
organic and software viruses that they
can quite properly be labeled “Power
Viruses.”
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Familiar Circumstances
 Power
viruses enter a computer system
unseen.
 By the time they announce their
presence, the damage has already begun.
 Like other viruses, the damage they
cause ranges from annoying to
disastrous.
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Familiar Circumstances
 Power
viruses result in the 3 D’s -Disruption, Degradation, and Destruction
 There is no cure for power viruses -they can only be prevented using
appropriate technology.
 There are six main power viruses that
pose problems for electronic systems
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Voltage Spikes and Impulses
Generated both inside
and outside a facility
 High voltage, high
energy events capable
of causing component
destruction.
 Prevented with a surge
diverter

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Electrical Noise
Created as a by-product
of the generation, distribution and use of
electricity.
 Low voltage, high
frequency
 Prevented by using a
noise filter.

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Common Mode Voltage
Any voltage measured
with reference to
ground (L-G, N-G)
 Disruptive to microprocessors.
 .5 volts maximum spec
 Prevented only with an
isolation transformer

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Voltage Regulation
Changes in amplitude of
the nominal line voltage
(sags, swells)
 Cause the malfunction of
linear supplies -- Not a
problem for SMPS.
 Prevented with a voltage
regulator.

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Blackouts
Long term, complete
loss of AC power
 Usually associated
with some
environmental event
 Prevented with a
UPS, generator or
battery bank

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Backdoor Disturbance
Most often overlooked
 Enters systems through
the backdoor
(datalines, phone lines,
I/O, etc.)
 Prevented with fiber
optics, opto-isolators,
or over voltage devices

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An Ounce of Prevention
 Power
viruses can be prevented
through the intelligent application of
the correct power conditioning device.
 As with organic viruses, some
prevention methods should be used in
combination.
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Combined Prevention
 Surge
diverters and power line filters
by themselves change normal mode
disturbances into common mode
disturbances.
 Computers with switch mode power
supplies (SMPS) are highly susceptible
to common mode voltage problems.
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Combined Prevention
 Isolation
transformers prevent common
mode voltage problems.
 Surge diverters and power line filters
should always be used in combination
with an isolation transformer.
 When used with SMPS, the isolation
transformer must be low impedance.
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Combined Prevention
A
power conditioner combining these
three elements is the foundation for all
effective power quality solutions.
 If power outages (blackouts) are a
problem, a battery and inverter can be
combined with these other elements to
provide a complete prevention solution.
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Don’t forget . . . . .
 Data
lines, telephone connections, and
network cables are the most often
overlooked pathways for power viruses
to enter an electronic system.
 If the system has connections to the
outside world, some method of
protecting these points must be installed.
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The Benefits
Prevent Disruption
Lockups
File corruption/data loss
Improper test results (medical and
analytical instrumentation)
Data communications errors
Missed/delayed schedules
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The Benefits
Prevent Degradation
Weakened or stressed components
Cumulative damage leading to failure
Unanticipated system downtime
Unreliable system operation
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The Benefits
Prevent Destruction
Failed power supplies
Destroyed components
Burned, charred circuit boards
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Like other viruses, power viruses can
be prevented. Intelligent use of the
correct power conditioning devices
will increase system reliability
performance, and productivity.
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We welcome
your questions.
Thank you
for attending.
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