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- W4294643406 abstract "The measurement of subharmonics in distribution systems requires instrument transformers to reduce voltage and current to levels fitting with the low voltage input of the power quality instruments. The in force international standards establish algorithms and methods for detecting, measuring and reporting subharmonics. In particular, the IEC 61000-4-7 suggests to perform the Discrete Fourier Transform over basic time frames of 10-cycles (12-cycles) for the 50 Hz (60 Hz) power frequency. Considering the case of 50 Hz constant power frequency, the spectral analysis is performed with a fixed spectral resolution of 5 Hz; thus, subharmonics with a frequency not integer multiple of 5 Hz could introduce inaccuracies in the measurements because of the spectral leakage. In this framework, this paper investigates the additional error contributions that can be introduced by voltage transformers used, at the input of power quality instruments, to measure subharmonics in compliance with international standards. The analysis is conducted through numerical simulations and experimental tests on two commercial voltage transformers based on different operating principles. Results show that the use of a voltage transformer to measure subharmonics, in compliance with international standards, could introduce higher additional errors compared to the ratio errors of the same device evaluated at subharmonic frequencies." @default.
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- W4294643406 date "2022-01-01" @default.
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- W4294643406 title "The Use of Voltage Transformers for the Measurement of Power System Subharmonics in Compliance With International Standards" @default.
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- W4294643406 doi "https://doi.org/10.1109/tim.2022.3204318" @default.
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