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Current Transformer Guides
Eight guides covering the questions that come up before a purchase order: burden, accuracy class, split core against solid core, Rogowski coils, shunts, residual monitoring and standards.
How To Calculate Current Transformer Burden
Burden is the single specification most often got wrong, and it is the one that quietly pushes a Class 0.5 transformer outside Class 0.5.
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Current Transformer Accuracy Class Explained
Two numbers on a rating plate decide whether a reading can be billed. Here is what they guarantee, and where the guarantee stops.
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Split Core Against Solid Core Current Transformers
One installs without an outage. The other is more accurate for the same size. The decision is almost always made by the installation, not the datasheet.
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Rogowski Coil Against Iron Core Current Transformer
A Rogowski coil is not a cheaper current transformer. It is a different instrument, and it wins in exactly the places an iron core loses.
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Current Transformer Installation Guide
Most current transformer failures are installation failures. Five habits prevent almost all of them.
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How To Choose A DC Shunt
A shunt is the simplest instrument in the panel and the easiest to order wrongly. Two numbers have to match, not one.
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Zero Sequence And Residual Current Monitoring
A phase current transformer sees a ground fault only once it is large. A zero sequence core sees it while it is still milliamps.
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Current Transformer Standards And What They Control
Tenders quote standards; datasheets quote numbers. This is the map between the two.
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If the guide does not answer it, a person will.