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In PQ News
Call of the Month for February 2025 Via the EPRI PQ Hotline, a PQ Knowledge funder inquired about gaining a better understanding of stray and contact voltage to address customer complaints effectively. Because of the breadth of the topic, we are addressing it over multiple editions of the PQ Hotline Call of the Month. In the December 2024 edition, we covered definitions of key terms, causes of stray and contact voltage, and a first-level decision tree for organizing a response. This edition provides an overview of key principles that are specific to detecting contact voltage. It describes electric fields originating from energized objects, the science behind sensing those fields, and some of the tools that use these principles to identify potential hazards.
Most Popular PQ Documents (Based on Clicks)
- DPQ Event Potential Increase in Stray Voltage Problems at Su ...
- 02/19/2010 Call About ASD/Motors
- Cause and Effects of Harmonics
- Power Quality Issues for Common Industrial Systems
- 2017 - Signature Journal
P1 Update
The P1 Update keeps members of Program 1 abreast of projects, supplemental projects, and other activities in the program, including a year-at-a-glance calendar.
EPRI Industrial PQ Training Videos
As a follow-up to our Industrial Power Quality training classes, we have posted these complementary training videos to help solidify the concepts for both utility members and their customers. The top three are listed here.
Visualizing PQ Drive Parameters for Improved Voltage Sag Ride-Through 
This video demonstrates the voltage sag susceptibility of AC drive systems and how to improve the drive’s robustness through parameter changes.
Understanding PLC Voltage Sag Ride-through: AC and DC Powered Systems
This video demonstrates the differences in voltage sag ride-through between an AC powered PLC system and a DC Powered PLC system.
Power Conditioning to Enhance Control System Voltage Sag Ride-Through: The Constant-Voltage Transformer
This video shows how a CVT can be utilized to harden the voltage sag response of an automated control system.