In a normal distribution network, the fundamental frequency is that of the voltage driving source, nominally 60Hz. Steady state deviations from the ideal 60 Hz sine wave shape are “periodic,”…
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Introduction to Voltage Sags
Voltage sags are short-duration power quality nuisances that can wreak havoc on sensitive electrical equipment. Identifying and classifying sags (as well as identifying their sources) can be a tedious and…
PQ Canvass — Getting Started
Power Monitors’ PQ Canvass is the premiere way to view and analyze power quality data. Born from Canvass, our first generation cloud-based system, PQ Canvass is a power platform to…
Using Python and Jupyter Notebooks to Analyze CPOW Data
Continuous Point on Wave (CPOW) data can be, by its very nature, exceptionally difficult to work with. The data sets can be in the hundreds of terabytes and the resolution…
Tensor, Simplifying a Complex Enviroment
PMI has introduced the Tensor, a next generation plugin power quality analyzer. The Tensor (Figure 1) is designed to plug in to any standard 3-prong receptacle. This white paper will…
Generating IEEE 519 Compliance Reports with PQ Canvass
The explosive growth of modern electronic loads presents a challenge to utilities in the form of waveform distortion. The IEEE 519 standard is an important tool for utilities, providing limits…
Recloser Violates ITIC Curve
Reclosers are electrical utility devices used to isolate faults occurring in an electrical grid. In their operation, if a fault is detected, they may disconnect and reconnect power several times.…
IEEE 1250 Overview: An Introduction to Power Quality
Whether you are new to the study of power quality, or an experienced PQ pro looking for a quick reference, IEEE Standard 1250 is the place to start. IEEE 1250…
Seeker Modbus Map
The Seeker power quality recorder includes a variety of mechanisms to retrieve measurements. One of is Modbus, a protocol often used for communication with industrial electronic devices. The protocol is…
Analyzing Portable Power Station Inverter Power Quality
An engineer at PMI purchased a portable power station and wanted to verify the quality of the inverter before attaching sensitive electronics. The steps used to quantify the output quality…
Viewing Power Consumption in the Cloud
Energy usage metering (in kWh) is now available at-a-glance from the PMI Canvass web application. This new feature will save you time while you diagnose internal and customer-facing issues by…
Dimming Residential Lighting
Dimmer switches for residential lighting applications have been available for decades. They are fairly ubiquitous in many homes and are often used for mood lighting and energy savings. The technology…