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| Subject: | Re: LF: Current Transformers (off topic, but expertise probably here) |
| From: | Alberto di Bene <[email protected]> |
| Date: | Wed, 14 Sep 2005 16:45:57 +0200 |
| Delivery-date: | Wed, 14 Sep 2005 15:46:26 +0100 |
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Andy wrote: Have you considered the possibility that for the material composing the core the ratio B/H is not a constant ? It could exhibit a change in value much before reaching the saturation point. But I am not an expert in metals, so take my words with a grain of salt...BUT, and I don't know how to account for it, there was a very significant non-linearity . Testing over a range of currents from 0.2A RMS to 9A, the slope of the Vout / Iin graph shifted by nearly a factor of 2. That says 'core saturation' to me, but I don't see how that can be. If the core is saturating with just 9V across a winding designed for 240V, it doesn't say a lot for the device in a PSU. Should reducing the value of the burden resistor help matters? 73 Alberto I2PHD |
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