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…
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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…
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,…
Cold Load Pickup
One of the most visible customer-facing challenges an electric utility can face comes in the form of voltage interruptions. From the short, fraction-of-a-second momentary to the prolonged, multi-hour (or even…
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…
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…
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…
Advanced Harmonic Analysis Through Bulk ProVision Exports
The IEEE 519-2014 harmonic standard calls for several advanced data analysis procedures. Some of these, especially when combining with data from other devices, may be performed in Excel or Matlab.…