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…
Power Quality White Papers
Power quality white papers on Power Quality.
206 white papers in Power Quality
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.…
Detecting Loose Neutrals with a Receptacle PQ Monitor
Loose/open neutrals can present a dangerous and even life-threatening situation in a residential service. The classic voltage symptoms suggesting this condition are one single-phase leg rising in voltage, the other…
PQ Recording Templates
This whitepaper describes the use and customization of PQ recording templates in PQ Canvass, iPowerPad, and in the ProVision software. PMI recording devices can be initialized with many different configurable…
Spotting Loose Neutrals with Waveform Capture
A "loose neutral" in a residential location can cause equipment damage and even a house fire. An open neutral may start as a high resistance connection that shows subtle signs…
A Simplified Approach to IEEE 519 Harmonics
IEEE 519-2014 specifies measurements, analysis methods, and limits for harmonic voltage and current. A full IEEE 519 study is a straightforward, but rigorous analysis that can require multiple recordings and…
Understanding IEEE 1159 Definitions
It is very important to have recommended guidelines and practices in place regarding power quality monitoring with the use of consistent terminology and definitions of power quality phenomena. This is…
Using Cycle Stripcharts
Stripchart recording is an important tool for analyzing complex data. It provides a visual means to easily digest extensive quantities of recorded information over long time periods. In most cases,…
Catching VFD Failures
Variable Frequency Drives (VFDs) present unique challenges as both a source of PQ problems as well as being sensitive to incoming voltage quality. A frequent complaint with a troublesome VFD…
Understanding How Harmonics Affect Power Factor
Power Factor (PF) is a measure of the efficiency of electric power delivery to a load. Traditionally the phase shift from inductive loads was the major cause of poor PF…
IEEE 519 Harmonics in Residential Locations
IEEE 519 specifies the measurement technique and limits for harmonics in a wide variety of locations, from transmission through distribution. For the first time, the 2014 edition also provides separate…
Voltage Sag Source: Upstream or Downstream?
The first step in voltage sag mitigation is finding the source of the sag. In a power quality recording, spotting the voltage sag itself is often easy, but determining whether…
