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Alternative Power
Inverter blending power is upsetting the Smeg Hob
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<blockquote data-quote="Den123" data-source="post: 1161782" data-attributes="member: 13454"><p>Harmonics and EMI/RFI are frequently misunderstood and "bundled" together in that misunderstanding. RFI is high frequency generated by (typically) the output stage, switching in the kHz region. The cables on the output radiate that energy like a radio transmitter. Harmonics on the other hand occur at multiples of the supply frequency, 50Hz in our country. Typically, one only sees odd multiples of the fundamental. Some (specifically the triplens) can be self cancelling. Anyway, you are dealing with 150Hz, 250Hz, 350Hz etc so a typical RFI filter won't work in resolving harmonic issues. Also, and this is not well understood by many, the typical RFI filter will filter the voltage. When it comes to harmonics, you aren't really worried about the distortion of the voltage (Thd U) because the source impedance is so low. The issue is that your piece of equipment is distorting the shape of the current you consume (Thd I) This requires totally different measures to eliminate. </p><p></p><p>Sorry for the long answer. This is a seriously fast growing issue in electrical engineering because of all the non-linear loads we connect to the grid.</p></blockquote><p></p>
[QUOTE="Den123, post: 1161782, member: 13454"] Harmonics and EMI/RFI are frequently misunderstood and "bundled" together in that misunderstanding. RFI is high frequency generated by (typically) the output stage, switching in the kHz region. The cables on the output radiate that energy like a radio transmitter. Harmonics on the other hand occur at multiples of the supply frequency, 50Hz in our country. Typically, one only sees odd multiples of the fundamental. Some (specifically the triplens) can be self cancelling. Anyway, you are dealing with 150Hz, 250Hz, 350Hz etc so a typical RFI filter won't work in resolving harmonic issues. Also, and this is not well understood by many, the typical RFI filter will filter the voltage. When it comes to harmonics, you aren't really worried about the distortion of the voltage (Thd U) because the source impedance is so low. The issue is that your piece of equipment is distorting the shape of the current you consume (Thd I) This requires totally different measures to eliminate. Sorry for the long answer. This is a seriously fast growing issue in electrical engineering because of all the non-linear loads we connect to the grid. [/QUOTE]
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Alternative Power
Inverter blending power is upsetting the Smeg Hob
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