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More in Power Quality

  • May 1, 1999
    article
    Electrical Construction and Maintenance

    Demystifying The TVSS

    So many things can cause spikes and surges, but a solid understanding and proper selection of TVSSs can help prevent damage to your equipment....More
  • Apr. 1, 1999
    article
    Electrical Construction and Maintenance

    Fuse Answers Questioned

    In January ’99 Readers’ Quiz, B.B.B. states the main fuse “did exactly what it was designed to do,” by taking “the overload from an incoming problem.”...More
  • Mar. 1, 1999
    article
    Electrical Construction and Maintenance

    Rounding Up Rotary UPS Features

    You must weigh the pros and cons before choosing a rotary over static UPS system....More
  • Mar. 1, 1999
    article
    Electrical Construction and Maintenance

    IEEE1346-1998: A New Tool To Combat Voltage Sags

    Recently approved, this new standard provides a method of determining compatibility between utility-caused voltage sags and your electronic devices. It also provides guidelines for corrective action....More
  • Feb. 1, 1999
    article
    Electrical Construction and Maintenance

    Power Quality Training: Its Past, Present, And Future

    With today's technology, power quality students have many choices. And as more electrical contractors strive to keep up with that technology, many new training methods become viable alternatives to costly classroom instruction....More
  • Feb. 1, 1999
    article
    Electrical Construction and Maintenance

    Effects of harmonics on power systems - Part 2

    Once you've recognized that harmonics are in a circuit or in an electrical system, the next step is to carry out tests to determine the magnitude and...More
  • Jan. 1, 1999
    article
    Electrical Construction and Maintenance

    Beware Of Line-Current Unbalance On VFDs 2

    Severe line-current unbalance can cause VFD nuisance tripping and 3rd harmonic currents, which are unusual for phase-to-phase nonlinear loads.Are you...More
  • Jan. 1, 1999
    article
    Electrical Construction and Maintenance

    Flexible Voltage Control for Increased Loads

    New device protects distribution circuit from the effects of an erratic local load....More
  • Jan. 1, 1999
    article
    Electrical Construction and Maintenance

    Power Factor Correction On Single Induction Motors 1

    Sometimes, you need to correct power factor (PF) at a single motor. This means sizing PF capacitors for that motor. The good news is if you size your...More
  • Jan. 1, 1999
    article
    Electrical Construction and Maintenance

    Ten Tips for Power Assurance

    Clean, reliable power seems to be more evasive than ever. Are there guidelines to follow that can ease the problem?...More
  • Oct. 1, 1998
    article
    Electrical Construction and Maintenance

    UPS System Comes Through During Ice Storm Downtime

    When Holmes Distributors, Inc.,Portland, Maine, lost electricity at about 11 o’clock one morning, Executive Vice President Gary DeVost thought everything...More
  • Oct. 1, 1998
    article
    Electrical Construction and Maintenance

    Make PQ Monitoring Meaningful

    Finding voltage quality problems is a lot like detective work. You rely on the power line monitor to gather evidence of any unseen disturbances. But, how can you ensure a safe monitor hookup and meaningful captured data?...More
  • Sep. 1, 1998
    article
    Electrical Construction and Maintenance

    PQ Tip: Computer Monitors and Jitters: It's Location, Location

    Your monitor's location dictates its susceptibility to magnetic fields. Close proximity to certain electrical equipment could spell problems and wiggles....More
  • Sep. 1, 1998
    article
    Electrical Construction and Maintenance

    Reader Picks a Fine Point and Makes Suggestions Re: Voltage Drop

    I have three requests for discussion of various interpretations of the NEC and methods of calculating voltage drops. (See March issue Back To Basics,...More
  • Sep. 1, 1998
    article
    Electrical Construction and Maintenance

    PQ Tip: Shorter Leads, Longer Motor Life

    You're seeing more premature motor failures. Is there a connection between these failures and the type of drive used? What effect has the length of the motor lead on the problem?...More
  • Sep. 1, 1998
    article
    Electrical Construction and Maintenance

    PQ Tip: PWM Drives May Have Bearing on Bearing Failures

    Your or your client's motors seem to have an inordinate amount of bearing failures. But, the motors aren't that old, and in some cases, are relatively new. You've checked for proper alignment, yet the problem begins anew after each bearing repair job. What's causing it?...More
  • Aug. 1, 1998
    article
    Electrical Construction and Maintenance

    Power Quality: How Bad is Bad?

    Are your equipment failures due to "bad power?" How bad can your power be, before being a problem? What electrical yardsticks can you use, and how reliable are they? Often, using these yardsticks will reveal simple, inexpensive solutions....More
  • Aug. 1, 1998
    article
    Electrical Construction and Maintenance

    Don't Let Sags and Interruptions Disturb You

    Voltage sags and interruptions can be costly forms of power quality disturbance. But using waveform capture information can help you find which event is causing the shutdowns....More
  • Jul. 1, 1998
    article
    Electrical Construction and Maintenance

    Harmonic Distortion: Definitions And Countermeasures—Part 3

    You know you have harmonics, because you've seen the graphical display on your harmonics analyzer. The big question is: "How do I get rid of them?" The answers lie not in magic, but in applying fundamental principles and possibly a few specialized cures....More
  • May 1, 1998
    article
    Electrical Construction and Maintenance

    Harmonic Distortion: Definitions And Countermeasures, Part 2

    Resolving harmonic problems is easier than some people would have you think. If you understand some basics, you'll be able to eliminate most of the mystery.In...More
  • May 1, 1998
    article
    Electrical Construction and Maintenance

    Quick Checkpoints To Prevent Lightning-induced Damage

    Be sure to make an annual visual inspection of your facility and check connections throughout the grounding system. And, don't forget to take bonding...More
  • Mar. 1, 1998
    article
    Electrical Construction and Maintenance

    Harmonic Distortion: Definitions And Countermeasures

    While harmonics are important, they need to fit into the larger context of power quality. While you must consider harmonics, they are not the demon some...More
  • Feb. 1, 1998
    article
    Electrical Construction and Maintenance

    A Balanced Way To Look At Power

    Balance is so important. We have balanced meals, balanced checkbooks, and balanced tires. We pride ourselves on laying out distribution panels such that...More
  • Feb. 1, 1998
    article
    Electrical Construction and Maintenance

    Engine Gen-Sets: Investing In Power Reliability

    New Jersey-New York City bridge uses packaged twin 400kW engine-generators to keep toll booths and roadway lighting operating.How do you keep the revenue...More
  • Dec. 1, 1997
    article
    Electrical Construction and Maintenance

    Meeting IEEE 519 THD Limitations: A Case Study

    Don't place a variable frequency drive (VFD) on a circuit until you determine the nature and magnitude of harmonics the drive may pump back into the feeding...More
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Abstract: This webinar will teach attendees the difference between risk and hazard, and how the choice of system grounding has a direct impact on reliability and safety.

 

 

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Jun. 17, 2013
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Electrical Construction and Maintenance

Arlington: 8" by 10" TV Box™

Our new TVB810 TV Box™ delivers the ultimate in versatility for installing wall-mounted TVs in retrofit projects. There's more room in the box for wires; plus, you can install it horizontally or vertically to ensure proper positioning of low voltage connections behind the TV....More

 

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