A "flickering lights" customer complaint may be the first symptom of a dangerous loose/open neutral. Loose neutrals can cause high voltage equipment damage, and in extreme cases, excessive current flow…
White Papers
Browse our library of power quality technical resources.
408 white papers
Configuring a Virtual Private Network
The use of telemetry devices equipped with cellular modems for low-bandwidth measurement and data collection has soared in recent years. There are many aspects to a successful deployment of cellular…
Networking the Ethernet Boomerang
PMI's Ethernet Boomerang monitors can be powered over Ethernet for real-time voltage, current, and power monitoring. The Ethernet Boomerang allows quick connection and communication over a company's network, without incurring…
New Graph Templates for Distributed Generation
The use of distributed generation (DG), e.g. photovoltaic and wind farm systems, presents new challenges to the electric network. Unpredictability and sudden changes in generated power results in changes in…
Detecting Recloser Events with Boomerang Monitors
Boomerangs provide advanced triggering mechanisms that can be used to detect and send an alert for Recloser events. A "Voltage Low Low" event will be used to trigger an alert,…
Finding the Source of Harmonic Problems
This white paper explores the feasibility of using a common measurement point between the source and load to determine the source of harmonics using only harmonic phase angle. Finding the…
Understanding Triplen Harmonics
With the push for energy efficiency comes the proliferation of non-linear loads whose overall effect on the power transmission system may not always be as beneficial as originally intended. The…
Understanding Parametric Graphs
Parametric graphs present a little-seen view of load waveforms. By graphing the current waveform against the voltage, a voltage-independent load signature can be established. This is useful for characterizing load…
Using Standard Deviation To Get More from Daily Profiles
The Canvass power quality portal provides the user many different tools for analyzing voltage, current and power over considerable periods of time. One such tool is the Daily Profile Graph,…
Overview of Harmonic Vector Diagrams
This white paper is an overview of Harmonic Vector Diagrams. The basics of 60 Hz phasors and harmonics are described, and steps for accessing harmonic vector diagrams in ProVision are…
Estimating THD with PF and DPF
True power factor (PF) and displacement power factor (DPF) are commonly available on power analyzers and loggers. Although useful on their own, together they can help estimate current THD, even…
Recording Harmonics
There are three primary recording types for harmonics in PMI recorders: stripcharts, daily profiles, and waveform capture harmonic analysis. Each of these has specific pros and cons, and setup considerations…
