IEEE IEEESTANDARDSASSOCIATION IEEE Guide for Identifying and Improving Voltage Quality in Power Systems IEEE Power and Energy Society Sponsored by the Transmission and Distribution Committee IEEE IEEEStd1250TM-2018 3 Park Avenue (Revision of IEEE Std 1250-2011) New York, NY 10016-5997 USA Authorized licensed use Downloaded on April 01,2019 at 14:16:42 UTC from IEEE Xplore. Restrictions apply. IEEEStd1250TM-2018 (Revision of IEEE Std 1250-2011) IEEE Guide for Identifying and Improving Voltage Quality in Power Systems Sponsor TransmissionandDistributionCommittee of the IEEEPowerand Energy Society Approved27September2018 IEEE-SA StandardsBoard Authorized licensed use Downloaded on April 01,2019 at 14:16:42 UTC from IEEE Xplore. Restrictions apply. Abstract:The use of some electrical equipment attached to typical power systems creates power quality concerns. There is an increasing awareness that some equipment is not designed to withstand the surges, faults, distortion, and reclosing duty present on typical utility distribution systems. Traditional concerns about steady-state voltage levels and light flicker due to voltage levels of these aspects of power quality and indicating how to improve them. Other documents that treat these subjects in more detail are referenced. Keywords: benchmarking, dips, disturbance analyzers, faults, harmonic distortion, IEEE 1250 light flicker,momentary voltage disturbances,noise,performance,power conditioners,power quality,sags,susceptible equipment, surge protection,surges,swells,transients,voltage fluctuation, voltage quality Some of the material used in this standard was reprinted with permission from documents produced by EPRl: EPRl makes no warranty or representations,expressed or implied, with respect to the accuracy, completeness, or usefulness of the information contained in the Material. Additionally, EPRl assumes no liability with respect to the use of, or for damages resulting from, the use of the Material. The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2018 by the Institute of Electrical and Electronics Engineers, Inc. IEEE is a registered trademark in the U.S. Patent & Trademark Ofice, owned by the Institute of Electrical and Electronics Engineers, Incorporated. PDF: ISBN 978-1-5044-5203-8 STD23330 Print: 1SBN 978-1-5044-5204-5 STDPD23330 IEEE prohibits discrimination, harassment and bullying.For more information, visit http:/www.ieee.org/web/aboutus/whatis/policies/pg- 26.html. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior writen permission of the publisher. Copyright 2018 IEEE. Al rights reserved. Authorized licensed use Downloaded on April 01,2019 at 14:16:42 UTC from IEEE Xplore. Restrictions apply. ImportantNoticesandDisclaimersConcerningIEEEStandardsDocuments IEEE documents are made available for use subject to important notices and legal disclaimers.These notices and disclaimers, or a reference to this page, appear in all standards and may be found under the heading“Important Notices and Disclaimers Concerning IEEE Standards Documents.""They can also be obtained on request from IEEE or viewed at http:/standards.ieee.org/IPR/disclaimers.html. NoticeandDisclaimerof LiabilityConcerningtheUseof IEEEStandards Documents IEEE Standards documents (standards, recommended practices, and guides), both full-use and trial-use, are developed within IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association ("IEEE-SA")StandardsBoard.IEEE("the Institute")develops its standards through a consensus development process, approved by the American National Standards Institute ("ANsI"), which brings together volunteers representing varied viewpoints and interests to achieve the final product. Volunteers are not necessarily members of the Institute and participate without compensation from IEEE. While IEEE administers the proc