In this white paper, power quality issues that can result from an Uninterruptible Power Supply (UPS) are discussed. Covered are the basic operational concepts of the more popular types of…
Power Quality White Papers
Power quality white papers on Power Quality.
217 white papers in Power Quality
Quickly Creating PQ Reports
The ProVision Publication Wizard is a quick way to create finished documents from individual graphs and reports. Use the wizard to create publication templates for different PQ applications, and then…
Measuring Power
The Revolution is a powerful tool for measuring and recording power quality information. With ProVision, there are a wide variety of ways to display and analyze many different types of…
Blondel’s Theorem: One Less Connection for Three-Phase Power
Polyphase power networks are among the most common networks for power transmission. They offer key advantages over single-phase networks. A polyphase system allows the same power to be distributed with…
Analyzing Voltage Sags with Event Change
Identifying the sources for voltage sags can be a somewhat complicated task. Graphs such as waveform capture can obscure the essentials with an RMS-based voltage sag. PMI provides a triggered…
CBEMA-ITIC Analysis with Stripcharts
The ITIC curve (formerly CBEMA) is a performance-oriented standard for electronic equipment manufacturers. The standard gives a method for classifying and plotting voltage events on a specially constructed graph that…
Recording for NEC 220 Compliance
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…
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…
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…
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…
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…