Utility customers who are expanding operations or adding load must comply with National Electric Code Article 220 to determine if any electrical upgrades are needed. Many customers will ask the…
White Papers
Browse our library of power quality technical resources.
408 white papers
Sharing Cloud Based Data
Canvass provides a cloud-based system for gathering, storing, and analyzing voltage, current, and power data from Boomerangs and Revolutions. In large deployments, with hundreds or thousands of devices, it's more…
THD Waveform Capture Triggering
The simplest waveform capture triggering is based on RMS voltage or current changes. While sufficient for voltage sags, recloser operations, etc., more complex events such as cap bank switches, narrow…
Zero Sequence Harmonics
In this whitepaper, I will discuss zero sequence harmonics: what they are, how they are created, and what issues they present to distribution systems and power quality. Zero sequence harmonics…
Measuring Current: Best Practices
PMI supports two types of current probes for measurements: Rogowski coil and iron-core clamps. Their distinct properties and characteristics need to be considered in a particular situation to better the…
CBEMA Graphs Revealed
The CBEMA (Computer Business Equipment Manufacturers Association) curve and the ITIC (Information Technology Industry Council) curve both refer to a similar method to visibly represent voltage events. A graph of…
Using Interharmonic THD Measurements
Harmonics and interharmonics are some of the most complex power quality quantities to measure and analyze. The Revolution is capable of recording interharmonic data, and ProVision can present the data,…
Key Issues with DG/DER Monitoring
The dramatic increase in distributed generation (DG), distributed energy resources (DER), and net metering scenarios brings sweeping, unplanned changes to the grid model. Local generation is often unpredictable, and sudden…
Real-Time Voltage Interruption Detection and Alerting
Utility situational awareness is critical with today's high customer expectations, increased regulatory scrutiny, and reliance on stable AC power. Voltage interruption/outage detection is the most basic, and usually the most…
Low-Energy Lighting and Power Quality
In this paper I reviewed the effects that Compact Fluorescent Lamps (CFL), Light Emitting Diodes (LED), and halogen lighting have on power quality. The CFLs and some LEDs present a…
Power Factor vs Displacement Power Factor
True power factor (PF) and displacement power factor (DPF) are commonly available on power analyzers and loggers. At first glance (and in some situations), they appear to measure the same…
Case Study of Portable Generator Power Quality
In this paper, power quality data taken from several different generators is reviewed. Standby and portable generators can be very important for backing up essential systems when utility power isn’t…
