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Welcome to the EPRI Power Quality Online Resource Center!

This site is provided for the benefit of funders of the EPRI Power Quality Knowledge (PQK) supplemental project. For those seeking to learn more about EPRI PQ Knowledge, please contact me, Bill Howe, Program Manager of Power Quality research for EPRI.

If you are a PQK funder and have not subscribed to this resource center, register today. For more information about subscribing to this site, please contact Bill Howe.

Program 1 Cockpit
status), project sets, supplemental projects, documents related to power quality, announcements, meetings and webcasts, and training.

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Impact of SEMI F47 on Utilities and Their Customers

It is of immediate interest to apply the SEMI F47 standard effort -- an equipment immunity standard -- to industries other than the semiconductor (SEMI) industry. To do that, it will be invaluable to learn what real impact the standard has had on the semiconductor industry. This report focuses on determining the true impact of the standard and whether SEMI F47 can be applied to other industries.

Industrial and commercial end users commonly upgrade their process equipment every few years. EPRI customers can help these end users avoid costly power quality problems by insisting on proper system compatibility specifications during equipment bidding and procurement stages. EPRI funders were instrumental in the successful effort to develop equipment immunity standards such as SEMI F47, which has benefited the semiconductor industry and the electric utilities serving these end users. Since its adoption, the SEMI F47 standard has been pursued and upheld by industrial partners, as opposed to the utility group who began the effort.

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Call of the Month for September 2019
Via EPRI’s PQ Knowledge (PQK) Power Quality Hotline, a PQK member asked why the equipment of an industrial customer inadvertently shut down on a sunny day with no evidence of a power quality event. Upon further investigation, radio-frequency interference (RFI) from a common handheld walkie-talkie was found to be the culprit.
Most Popular PQ Documents (Based on Clicks)
  1. ASD Ride-Through Methods Using Built-in Code Parameters
  2. 05/03/2017 Hotline Call About Measurements
  3. Calculating Sag Magnitude Through a Series of Transformer Co ...
  4. Energization of PV Transformers Causes DC Drives to Shut Dow ...
  5. The Effects of High and Low Steady-State Voltages on End-Use ...
EPRI Swimming Pool Stray and Contact Voltage Research Outcomes: June 2010 to June 2019

Testing by EPRI between 2010 and 2018 has determined and verified that nuisance tingling sensations by swimming pool users are precursors to a swimming pool that could become an unsafe electrical shock hazard during 120Vac household line faults. To understand this phenomenon from a scientific basis, EPRI tested two different types of in-ground pool shell designs. The results provide for an industry that is better informed and better able to develop recommendations to promote effective electrical safety around swimming pool environments. This knowledge is beneficial for pool builders, electrical inspectors, pool shock incident investigators, and pool owners.

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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.

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White Paper on Advanced Settings for Distributed Energy Resources

The EPRI White Paper titled Recommended Settings for Voltage and Frequency Ride-Through of Distributed Energy Resources  discusses the implications of recommended advanced settings of distributed energy resources to support power quality, reliability, and the grid.

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 the utility members and their customers.

Video 1: 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.

Video 2: 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.

Video 3: 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.

Video 4: IEEE Standard 1668 
This video provides an overview of the IEEE Std. 1668, Recommended Practice for Voltage Sag and Short Interruption Ride-Through Testing for End-Use Electrical Equipment Rated Less than 1000 V.

Video 5: Power Conditioning with Dip-Proofing Inverters (DPIs) 
This video demonstrates the application and effectiveness of the capacitor-based dip-proofing inverter (DPI)

Video 6: Power Conditioning with “Nice” Cube Relays) 
This video demonstrates the susceptibility of the common ice-cube relay and the application of the "Nice Cube" relay solution.

Video 7: Power Conditioning with MiniDySC Systems 
This video shows how the Mini Dynamic Sag Corrector (MiniDySC) can be utilized to harden the voltage-sag response of an automated control system.

Video 8: Power Quality Mitigation Technologies 
When equipment is identified as sensitive to variations in power quality, what may be done to mitigate this sensitivity? This video explains various approaches.

Video 9: Power Conditioning with the Voltage Dip Compensator (VDC) 
This video demonstrates the application and effectiveness of the fast transformer tap-changing device called the voltage dip compensator (VDC).

Open PQ Dashboard Version 2.0

Version 2.0 of the Open PQ Dashboard is now available at the following link: