What are zero sequence harmonic filters and how do they reduce 3rd harmonic currents and prevent neutral conductor overheating?

Published by Mirus International Inc., [2010-01-08] MIRUS-FAQ001-B2, FAQ’s Harmonic Mitigating Transformers, 31 Sun Pac Blvd., Brampton, Ontario, Canada. L6S 5P6. Zero sequence currents, in simple terms, are those found in the neutral conductor. They include the unbalanced 60 Hz currents and the 3rd, 9th, 15th and other triplen harmonic currents. Zero sequence currents appear inContinue reading “What are zero sequence harmonic filters and how do they reduce 3rd harmonic currents and prevent neutral conductor overheating?”

How do harmonics increase power losses and overheat transformers?

Published by Mirus International Inc., [2010-01-08] MIRUS-FAQ001-B2, FAQ’s Harmonic Mitigating Transformers, 31 Sun Pac Blvd., Brampton, Ontario, Canada. L6S 5P6. Harmonics generated by non-linear loads substantially increase the losses in conventional or K-rated delta-wye distribution transformers. This increase in losses will increase operating costs and can shorten transformer life. The main thrust of the K-ratedContinue reading “How do harmonics increase power losses and overheat transformers?”

K-Factor Defined

Published by Xitron Technologies, Manufacturers of Engineering and Production Test Equipment, An ISO 9001:2000 registered company, AN102 Application Note. In today’s industrial workplace, the proliferation of solid state devices (lighting ballasts, motor drives and controls, communications equipment, and other DC-powered loads) has created a major problem for specifying engineers, contractors and building owners. The non-linearContinue reading “K-Factor Defined”

What is Harmonic Study and Analysis and Why it is Done?

Published by Carelabs (Carelabz) The current significant growth in electronic devices focusing providing our installations has given rise to a significant change in the last few years on the type of loads connected to the electrical distribution system. Not so long ago the only concern there was when using electricity at home, in establishments andContinue reading “What is Harmonic Study and Analysis and Why it is Done?”

FLEX-CORE® Glossary of Terms

Published by FLEX-CORE®, Div. Morlan & Associates, Inc. Current Transformers Usually rated on a basis of 5 amperes secondary current and used to reduce primary current to usable levels for transformer-rated meters or transducers and to insulate and isolate them from high voltage circuits. Current Transformer Ratio Ratio of primary to secondary current. For aContinue reading “FLEX-CORE® Glossary of Terms”

Power Quality Measurements in All Voltage Levels of the Utilities up to 150 kHz – Is it Possible?

Published by Roland Buerger (MBS AG), Business Development/R & D, MBS AG, Sulzbach-Laufen (Germany), Email: rbuerger@mbs-ag.com Bernhard Grasel (NEO MESSTECHNIK), Sales Manager, NEO Messtechnik, Zoebern (Austria), Email: bernhard.grasel@neo-messtechnik.com A reliable energy supply has meanwhile become an important location factor for many companies. While power failures and voltage fluctuations were among the most important parameters ofContinue reading “Power Quality Measurements in All Voltage Levels of the Utilities up to 150 kHz – Is it Possible?”

Frequency Response of Instrument Transformers in the kHz Range

Published by Dr. Kerstin Kunde, Dr.-Ing. Holger Däumling, Dipl.-Ing. Ralf Huth, Dipl.- Ing. Hans-Werner Schlierf and Dr.-Ing. Joachim Schmid As the number of non-sinusoidal sources and loads in the network continues to grow, the importance of information concerning the quality of the current and the voltage becomes ever more important. Each deviation in frequency canContinue reading “Frequency Response of Instrument Transformers in the kHz Range”

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”