White Spots and Scratches: Diagnose the Surface Before Naming the Defect
A white spot on a GOES sheet is a location to…
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Testing, standards & specification
Practical engineering articles for transformer-core selection, design and production.
65 articles
Insulation Coating Is a Measured Function, Not a Yes-or-No Feature
"Both sides coated" leaves the most useful co…
Read full articleSurface Rust on GOES: What Should Decide the Disposition?
Colour is a poor acceptance criterion for a r…
Read full articleWhy Restacking the Same Laminations Can Change Performance
Keep every lamination. Change the assembly. T…
Read full articleCore Rework: Restoring Dimensions Without Losing Functional Control
The instruction "grind until it fits" should …
Read full articleRoot Cause Analysis: A Replacement Core Is Not an Explanation
Consider a passing replacement core and a cor…
Read full articleWhen All Factory Checks Passed but the Customer Still Has a Problem
"It passed here" and "it does not work here" …
Read full articleA Passing Final Test Does Not Establish a Stable Process
Every core in the shipment can pass while the…
Read full articleWhat In-House Core Testing Actually Changes
The value of a core test station is measured …
Read full articleSame CRGO Grade, Different Coil: Managing the Variation
A grade designation defines requirements. It …
Read full articleWhy Purchasing and Engineering Disagree About a Core Supplier
Purchasing says the supplier delivered on tim…
Read full articleA Stricter Core Specification Is Not Always a Better Specification
Before tightening a specification, name the f…
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