This paper covers what a variable frequency drive (VFD) is, the different types of VFDs, their functions, and their benefits. Also covered are issues related to VFDs, some solutions to…
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51 results by Cowles Andrus III — Clear
Understanding Total Harmonic Distortion
This paper discusses the causes of Total Harmonic Distortion, how it is calculated, measured, and how it can impact a power distribution system.
Power Transformer K-Factor
In this white paper I review K-factor in regards to power transformers, how K-factor is defined and calculated and how K-factor is used. K-factor is a way of rating or…
Analyzing Voltage Sags with RMS Capture
This white paper covers the topic of voltage sags and a sometimes under-used graphing feature in Provision called the RMS Capture graph. The RMS Capture graph can be very revealing…
Case Study: Electric Tankless Water Heaters and Power Quality
In this case study, an investor-owned utility responded to a residential customer complaint. The root cause was a newly installed electric tankless water heater, requiring a transformer upgrade beyond the…
Voltage Sags and Power Quality
This white paper describes what voltage sag is, some of the most common causes of voltage sag, the adverse effects voltage sags have on end users, and how to monitor…
Electric Tankless Water Heaters and Power Quality
In this whitepaper the basics of electric tankless water heaters (TWHs) are presented, along with their potential impact on voltage quality. Real-world graphs are discussed to illustrate the significant impact…
IEEE Std. 141 Flicker Curve vs. IEEE 1453 Flicker Meter
In this whitepaper I describe and compare two of the IEEE Flicker standards, the older standard 141 (the GE Flicker Curve), and the newer IEEE 1453 (Flicker Meter standard). The…
Cell Signal Strength Inside Metal Enclosures
In this White Paper I investigate the effect that a metal enclosure has on cell signal strength. A frequent question that we have is how can we get a cell…
Using the Revolution Cell Antenna Kit
In this White Paper I address the installation and use of the Revolution cell antenna kit (Shown in Figure 1), including some of the questions customers have about antenna selection…
Voltage Notching in IEEE Std. 519-2014
In this white paper, I cover the new IEEE Std 519-2014 limits for voltage notching, how these limits are calculated, and how to use ProVision to make the notch measurements.…
Power Factor Correction Capacitors and Resonances
This paper explains some of the issues concerning power factor correction, and the side-effect of resonances that can be detrimental to a power distribution system. Also are some solutions to…