Welcome to the EPRI Power Quality Online Resource Center!
This site is provided for the benefit of funders of the EPRI Power Quality Knowledge program (PS1D). For those seeking to learn more about EPRI PQ Knowledge, please contact me, Bill Howe, Program Manager of Power Quality research for EPRI.
To take advantage of the PQ Online Resource Center, please register for MyPQ. “Guest Level” access privileges will be granted initially to all registrants. “Funder Level” access will be granted automatically to funders through manual review of new “MyPQ” registrants — a process that may require 1-2 working days. Please contact Bill Howe if you are an EPRI PQ Knowledge (PS1D) funder and your need for “Funder Level” access is urgent.
Again, Welcome to the PQ Online Resource Center!
Call of the Month for July 2010
Via EPRI's PQ Knowledge (PQK) Power Quality Hotline, PQK funders asked compatibility engineers EPRI to provide information about malfunctions of an intelligent microprocessor-based dimming panel used in commercial buildings. Because the problem with intelligent dimming panels is complex, this Hotline Call of the Month is divided into three parts. The first part--issued for June 2010--discusses the basics of dimming panel systems that use 0 to 10 volt DC analog control along with some basic troubleshooting questions and a refresher regarding how conducted emissions are defined. This--the second part--discusses the characteristics of the first problem malfunction--a sporadic dimming problem. The final part will present the characteristics of the second problem malfunction--a permanent dimming problem. This three-part Call of the Month is centered around reported malfunctions caused by the corruption of the analog dimming signal, which is attributed to electrical noise.
C4.110 final report is now available
The CIGRE joint working group C4.110 final report is now available. Entitled "Voltage Dip Immunity of Equipment and Installations", the report is available at no cost for download on the Union of Electricy Applications (UIE) website at www.uie.org/node/401. EPRI worked closely with this joint working group over is effort over a three year period. The findings from this report should be instrumental in guiding future voltage sag related power quality standards.
PQView / PQWeb Users Group
The PQView® Users Group is intended to assist power quality engineers in managing and analyzing power quality data. The user group's purpose is to support and inform the PQView user and to provide a forum for communication and sharing of ideas among its members.
In PQ News:
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EPRI Calls on Industry to Build a Better AC Ice Cube Relay
Modern industry requires a more robust alternative to the standard AC ice cube relay. If SEMI F47-compliant units are made available, many power quality-related shutdowns could be avoided and industrial plants could save from several hundred thousands to several millions of dollars each year.
EPRI is calling on the manufacturers of control components to develop a line of control relays with improved voltage-sag robustness
