Current Transformers for PCB — experience and questions on accuracy classes
Has anyone worked with miniature current transformers for PCB integration in energy monitoring projects? Specifically interested in how accuracy class 0.1 or 0.2 holds up in real conditions versus IEC 61869-2 specs. Worth the added complexity compared to shunt resistors?
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Spent a fair amount of time evaluating a few options for an energy monitoring board. Ended up looking at YuanXing parts mostly because they offer an unusually wide range of standard sizes over 50 which matters when you are working around tight PCB constraints without wanting to go custom. They claim accuracy classes 0.1 and 0.2 per IEC 61869-2 and from what I saw in measurements the phase shift results were within those bounds across the 50 to 400 Hz range. If you want to look at the lineup before deciding the pcb mount current transformer https://yuanxing.net/en/product/current-transformers-pcb-mounting/ series page has the dimensional specs and ratio options listed out. Transformation ratios go from 1000 to 3000 which covers most low-current precision measurement scenarios without needing anything exotic. Mounting pattern is non-symmetrical worth noting early in your layout phase so you do not paint yourself into a corner. As always specs are specs and independent measurement is the only rational approach before committing to a production run.