Beware Rotation Issues on Transformers

Published by Tom Shaughnessy, Shaughnessy Consulting Services 208 Jasper Way, San Marcos, CA 92078 408-666-4009 Background Phase rotation is something that contractors and electricians routinely check during construction and installation of motors and UPS systems. In facilities with only one service, seldom does a rotation change require utility involvement. However, complications can and do ariseContinue reading “Beware Rotation Issues on Transformers”

Power Quality the Economic Challenge for Utilities & Users

Published by Terry Chandler, Director of Engineering, Power Quality Thailand LTD/Power Quality Inc., USA.E-mail:, Please feel free to leave a question in the comments section or contact Terry Chandler,,

Characterizing PQ values Power Quality Incidents

Published by Terry Chandler, Director of Engineering, Power Quality Thailand LTD/Power Quality Inc., USA. E-mail:, PQIncidentsTM A PQIncidenstTM occurs when one or more of the PQ parameters exceeds a specification or causes a problem for a load A PQIncidenstTM is comprised of one or more events A PQIncidentsTM is a definable point in time and powerContinue reading “Characterizing PQ values Power Quality Incidents”


New Portable Power Logger + PQ Detector! Introducing DranXperT – a new portable, low cost, power logger and PQ detector from Dranetz. DranXperT is two products in one: Accurate, 3 phase, bi-directional power/energy logger PQ detector with 1/2 cycle resolution to identify and record common PQ issues such as sags/dips, swells, and interruptions, as well as changesContinue reading “DranXperT”

The Effects of Changes to IEEE 519-1992 to 2014

Published by EATON, Powering Business Worldwide Application Note AP040094EN, Effective November 2014 Introduction Recent changes have been made to IEEE 519. These revisions add clarity to the 1992 document as well as present new definitions, methods and recommendations. This brief summary of changes to IEEE 519 as it pertains to low voltage adjustable frequency drivesContinue reading “The Effects of Changes to IEEE 519-1992 to 2014”