The Docs

Welcome to the Power Magnetics Institute Blog. We are privileged to have these two gentlemen as part of our distinguished faculty to enlighten, elucidate and otherwise inform you, our readers on the art and science of transformers and reactors. While the two might appear to be the same to the uninformed eye, they are actually quite different in form, fit and function. That is true of the transformers and reactors as well!

Enjoy your reading, please leave us a comment or two, and come back often for the next installment!

Dean of Faculty
PMI Institute

Iron Core Reactors for Harmonic Filter Bank Applications – Part 1

Docta Reacta:  Today I would like to provide some elucidation and enlightenment on iron core reactors when they are used in harmonic filter banks! When OEM’s are looking for high reliability filter bank reactors, it comes down to a simple choice: Power Magnetics. Why? Because we have a very long history of providing iron core reactors, sometimes called harmonic filter reactors, to the manufacturers of harmonic filter banks that go into some of the most difficult applications[…]

Plate Transformers and VPI (Vacuum Pressure Impregnation) In Detail

Dr. Transformer:  Welcome back to the Power Magnetics Institute, my friends!  Our customers have been asking for a clarification of the VPI and plate transformers post we discussed earlier. Vacuum Pressure Impregnation (VPI) is the process of treating the finished coils with varnish by placing it a vacuum chamber.  First, the transformer is placed in an oven and heated to approximately 275 ˚F. This heat treatment drives out moisture from the[…]

Power Magnetics Products Deployed in World’s Most Extreme Conditions for Global Energy Businesses

Press Release Energy Industry Leader Celebrates 45 Years Power Magnetics Inc. Products Deployed in World’s Most Extreme Conditions for Global Energy Businesses Trenton, NJ USA April 10, 2014  Power Magnetics, Inc. Celebrates 45 Years PMI celebrated its 45th anniversary recently with a festive gathering. “Power Magnetics has just completed its new strategic plan and we are in the process of implementing it as we look to significant growth over the[…]

The Anatomy of Stray Flux in 3 Phase Reactors

Docta Reacta: Hey, hey, nice to be back in front of the class at the Power Magnetics Institute of higher learning for your increased enlightenment and edification as I illuminate you with some technical elegance! Hmmm…. Overboard I hear, ringing in my ears! The discussion of stray flux in the design and application of 3 phase reactors is insufficiently addressed by systems engineers when trying to deploy them in more[…]

Percentage Impedance of Transformers

Dr. Transformer: Back from the holidays transformed!  Got on the scale this morning and.. oh, my! Certainly transformed!  Enough!  The questions about impedance continue to come in unimpeded! So let’s get to it! It is very common to see transformers specified with ‘Percent Impedance’. Because stating impedance in percentage terms is as a result of the ‘per unit’ system favored by power engineers, it isn’t surprising that it causes confusion[…]

A Video Explanation of Single Phase Trap Reactors

A Video Explanation of Single Phase Trap Reactors

  Docta Reacta:  Welcome dear PMI Institute learners!  Today I have a treat for you!  PMI’s very own Mike Smith, an up and coming star with Hollywood potential, I am sure you will agree, will provide you with a illuminating discussion of Power Magnetics Inc.’s Single Phase Trap Reactors. These medium voltage trap reactors have become the industry standard and as I have explained in previous posts, are nearly indestructible[…]

Medium Voltage Trap Reactor – Inner Secrets Revealed!

Docta Reacta:  Welcome to the inner sanctum of PMI Institute!  Today, we reveal one of the major secrets that have made the Power Magnetics, Inc. floating core medium voltage trap reactors (MVTR) an industry standard.  Read on, dear PMI Institute student! Using (3) 1Ø ‘Floating Core’ Reactors vs (1) 3Ø ‘Grounded Core’ Reactor On the 1Ø :   In a “Floating Core’ Medium Voltage Trap Reactor, the center point of the[…]

Converting 3Ø to1Ø using the Scott ‘T’ in Transformers

Dr. Transformer:  Myth-busters 101 today: Are we on TV? No? OK, well today we are talking about converting: your thinking, and 3 phase to 2 phase! There is a recurring myth in the electrical industry that it is advantageous to convert three phase (3Ø) to single phase (1Ø) using the Scott ‘T’ (refer to last week’s article).  Nothing can be further from the truth.  This typically comes up for us[…]

Scott ‘T’ Connections for Furnace Transformers, Auto Transformers and Distribution Transformers

Dr. Transformer:  Welcome back to PMI Institute for today’s discussion of Scott ‘T’ Connections!  Say what?  Social networking?  Not here!  And no Scotty beam me up, either! (Get it?)  No, this is about transformers!  Furnace Transformers, Auto Transformers and Distribution Transformers in particular and their connection options.  This is one part of the story. The ‘Scott’ connection is the most popular way to connect three phase, 3Ø, to two phase,[…]

Vacuum Pressure Impregnation, VPI, and Atmosphere Dip – The Trade-offs

Docta Reacta:  Today’s topic at PMI Institute addresses when Vacuum Pressure Impregnation, VPI, makes sense for your transformers, like a high voltage plate transformer or medium voltage trap reactor and when it does not and Atmosphere Dip is more appropriate. Thank you for the applause.  Thank you! Thank you!  Wow, what a warm reception!  I realize that this is my first appearance on the new stage here at Power Magnetics Institute, and I[…]