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Discrepency between consumption data. smart meter V inhome display.at
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<blockquote data-quote="GM at CA UK" data-source="post: 545223" data-attributes="member: 29506"><p>I have seen this before where it was due to the inability of the IHD (or rather the current clamp feeding it) to measure all of the current that was being consumed. In that case the IHD clamp had a poor frequency response (lower cost) and did not include the higher frequency currents (harmonics) in its measurements. Nowadays, when an installation is only consuming small currents they are often made up of loads with high harmonic content (LED lights, IT equipment, Power Supplies, etc.). When you are running at 1.8kW I'm guessing there are probably larger "non-linear" loads connected (heating elements, directly coupled motors, etc.) that don't produce many/any higher frequency harmonic currents that the IHD clamp can miss. With the larger loads connected the harmonic content of the smaller loads becomes proportionally less significant and the difference in readings diminishes, as you saw. One of our customers made a video that shows the big difference in readings across a selection of clampmeters in the presence of high harmonic currents. The clamp that comes with your IHD, and even the IHD itself, are probably not the greatest items when it comes to frequency response, and that being the case will also read low in the same way the various clamps in the video do. You can see the video here [MEDIA=youtube]0Gd3viQJ9K0[/MEDIA]</p></blockquote><p></p>
[QUOTE="GM at CA UK, post: 545223, member: 29506"] I have seen this before where it was due to the inability of the IHD (or rather the current clamp feeding it) to measure all of the current that was being consumed. In that case the IHD clamp had a poor frequency response (lower cost) and did not include the higher frequency currents (harmonics) in its measurements. Nowadays, when an installation is only consuming small currents they are often made up of loads with high harmonic content (LED lights, IT equipment, Power Supplies, etc.). When you are running at 1.8kW I'm guessing there are probably larger "non-linear" loads connected (heating elements, directly coupled motors, etc.) that don't produce many/any higher frequency harmonic currents that the IHD clamp can miss. With the larger loads connected the harmonic content of the smaller loads becomes proportionally less significant and the difference in readings diminishes, as you saw. One of our customers made a video that shows the big difference in readings across a selection of clampmeters in the presence of high harmonic currents. The clamp that comes with your IHD, and even the IHD itself, are probably not the greatest items when it comes to frequency response, and that being the case will also read low in the same way the various clamps in the video do. You can see the video here [MEDIA=youtube]0Gd3viQJ9K0[/MEDIA] [/QUOTE]
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