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Electromagnetic interference on static meters when combining linear and non-linear loads

Müller, K. (2022) Electromagnetic interference on static meters when combining linear and non-linear loads.

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Abstract:Non-linear devices such as switch-mode power supplies and dimmers are used on an ever increasing basis. Previous studies show that there is electromagnetic interference between these non-linear loads and some commercial static energy meters, resulting in large errors when measuring energy consumption. These studies mostly focused on the impact of an isolated non-linear load. In a real household we find both linear and non-linear loads. By studying what happens to the interference when both non-linear and linear loads are present this paper better establishes the impact of the problem in an on-site situation. In a setup with 24 static meters of different types, previously found interfering non-linear loads are put in parallel with linear loads. For some meters, based on shunt and current transformer methods, absolute errors tend to zero when a linear load is present. It is also shown that the addition of a linear load has a minor impact on the error of around 10 % per kW for some Rogowski coil based meters. The interference is not effected by current sensing type alone as most tested meters show no errors at all. Most importantly the study shows that the Rogowski coil meters that have shown most significant interference in previous studies, still give errors over 450 W and −220 W with a linear load above 1800 W present. This means that some meters indeed pose a very real problem, not just in the lab with isolated loads, but for everyday consumers.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering BSc (56953)
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