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…
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…
Hidden Delta Voltage Unbalance
Voltage unbalance can cause severe heating in motors and large DC power converters. Although most voltage unbalance is caused by unequal loading among phases, shifts in voltage phase angle can…
Overcurrent Protection with Fused Leads
PMI offers a fused voltage lead kit for increased safety with the Revolution and Eagle power recorders. Although not required to meet UL safety standards with these recorders, the fused…
Getting Started with the Pole Mount Boomerang
This white paper will explain the process of installing and communicating with a Pole mount Boomerang voltage/current/power sensor (Figure 1). The pole mount option includes a rugged, weatherproof NEMA 4X…
Using TLAR CTs
TLARs are PMI's iron core CT (Current Transformer) clamps, available in various probe and channel configurations. These clamps are used for lower range current measurements, with ranges of 20A or…
Motor Start-Up from All Angles
ProVision has a multitude of graphs available that are great for analyzing the various aspects of motor startup and the PQ issues that arise while operating these devices. Using an…
Getting Started with the 3-Phase Boomerang
The 3-phase Boomerang sends continuous voltage, current, and power information to Canvass, PMI's cloud-based data analysis package. The Boomerang and Canvass provide web-based graphing of 3-phase stripchart, daily profile, and…
Introduction to Harmonic Bar Charts
The presence of harmonics in the voltage delivered to homes and businesses is pretty much a given due to the increase in non-linear loads in use today. These loads include…
Oscillatory Transient Ring Frequency
This white paper provides details on how to estimate ring frequency caused by resonances formed between power corrections capacitors and inductive loads using ProVision. Waveform data captured using PMI's Eagle…
Using Bluetooth with PMI Recorders
This white paper documents the procedure for installing a Bluetooth device and the proper communication settings for wireless PMI Recorders using ProVision software. PMI offers several power quality recorders for…
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.…