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| Feature Articles: | |
Reliability News - Impact of Unstable AC Mains on Telecom and
other High-tech Equipment |
TechKnowledgy - Playing Roulette |
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Case Study - Transformer Derating |
PQ Tip of the Month - Harmonic Pollution |
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PQ Rules - Unseen Transients |
Promotion of the Month - Refurbished Power Platform PP-4300
Package |
| Reliability News: Impact of Unstable AC Mains on Telecom and other High-tech Equipment | |
| International Electrotechnical
Commission (IEC) standards assume that power generation and
distribution are fairly stable commodities and that voltage
excursions will not be outside the specified input window of 184
Vac to 264 Vac. Unfortunately, that is not the case in many
developing countries throughout the world... ...read more by clicking here>>> |
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| TechKnowledgy: Playing Roulette | |
| Getting some people to pay
attention to power quality issues is often like trying to sell
them insurance. Power quality phenomena has been around since
Westinghouse and Edison debated whether generation should be AC
or DC power. But what has been changing is the increase in "PQ
pollution" and the susceptibility of equipment to... ...read more by clicking here>>> |
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| Case Study: Transformer Derating | |
| A 120 Volt, 75 kVA Transformer
supplying computer workstations was running very hot at an
office building. A check of the load current that the
transformer was supplying showed that the amperage level was...
...read more by clicking here>>> |
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| PQ Tip of the Month: Harmonic Pollution | |
| It is usually the harmonic currents
that are of concern, as they can cause "harmonic pollution" to
spread to other equipment. Just like Current * Impedance =
Voltage for fundamental frequency, Ohm's Law also applies to
harmonic current, impedance and voltage... ...read more by clicking here>>> |
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| PQ Rules - Unseen Transients | |
| Just about everyone who has a
computer at work or home has the line cord plugged into an
outlet strip that is sold to prevent power quality problems that
would "wipe out your data and may even destroy your computer."
These outlet strips usually have several TVSS devices within
them to clamp voltage transients at "safe" levels. And while...
...read more by clicking here>>> |
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| Promotion of the Month - Refurbished Power Platform PP-4300 Package | |
...read more by clicking here>>> |
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