Average W/kg Can Hide a Local Problem
A core can have an acceptable average loss wh…
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Testing, standards & specification
Practical engineering articles for transformer-core selection, design and production.
65 articles
A No-Load Loss Failure at Transformer FAT
FAT has found excessive no-load loss. The inv…
Read full articleWhat 90%, 100% and 110% Excitation Can Reveal
One excitation point gives you a result. Seve…
Read full articleHigh Measured Loss: Start with the Measurement Boundary
Before ordering a different CRGO grade, repea…
Read full articleNormal Loss, High Exciting Current: Where to Start
The watts are acceptable. The exciting curren…
Read full articleOne Joint-Gap Reading Cannot Represent a Whole Stack
The inspection sheet shows one joint-gap valu…
Read full articleA Factory Pass Does Not Freeze the Core for Transport
A magnetic test report records a condition at…
Read full articleWhen a Lift Changes the Test Result
A core passes before lifting and reads differ…
Read full articleWhat a First Trial Order Should Prove
Do not spend the first trial order proving on…
Read full articleA Supplier Audit Should Follow One Core Backwards
Skip the second tour of the cutting line. Cho…
Read full articleWhat Should the Core Supplier Actually Guarantee?
"We guarantee the material" and "we guarantee…
Read full articleTransformer Core Procurement: From Steel Mass to Performance
Your purchase order counts kilograms. Your tr…
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Engineering reference notes
Short reference notes complement the full published articles.