© 2001 powervar, inc. your logo. © 2001 powervar, inc. your logo power viruses preventing...
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© 2001 POWERVAR, Inc.
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Logo
© 2001 POWERVAR, Inc.
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POWER VIRUSES
PreventingElectronic 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, distri-bution 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 micro-processors.
.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 DisruptionLockupsFile corruption/data lossImproper test results (medical and
analytical instrumentation)Data communications errorsMissed/delayed schedules
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The Benefits
Prevent DegradationWeakened or stressed componentsCumulative damage leading to failureUnanticipated system downtimeUnreliable system operation
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The Benefits
Prevent DestructionFailed power suppliesDestroyed componentsBurned, charred circuit boards
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Like other viruses, power viruses can be prevented. Intelligent use of the correct power conditioning
deviceswill increase system reliability performance, and productivity.
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We welcome your questions.
Thank youfor attending.