Testing of current Instrument Transformers relies on low-distortion wideband generation, in particular for the modern exigency of extending testing in the supraharmonic range (up to 150 kHz). Whereas single-Tone amplitude accuracy and controllability has been mostly considered so far, low-distortion for non-linearity verification and transient behaviour in presence of commutating semiconductor devices are also relevant. The design of a stable, accurate and low-distortion amplifier is discussed, featuring 15 A output and sub-\mu s rise time in the present realization, but scalable to higher current. Design solutions were selected that can be easily replicated, including minor variants to adapt to different exigencies. Preliminary experimental results of the prototype are reported.
Design of a Wideband Amplifier to test Instrument Current Transformers in the Supraharmonic Range
Mariscotti A.
2025-01-01
Abstract
Testing of current Instrument Transformers relies on low-distortion wideband generation, in particular for the modern exigency of extending testing in the supraharmonic range (up to 150 kHz). Whereas single-Tone amplitude accuracy and controllability has been mostly considered so far, low-distortion for non-linearity verification and transient behaviour in presence of commutating semiconductor devices are also relevant. The design of a stable, accurate and low-distortion amplifier is discussed, featuring 15 A output and sub-\mu s rise time in the present realization, but scalable to higher current. Design solutions were selected that can be easily replicated, including minor variants to adapt to different exigencies. Preliminary experimental results of the prototype are reported.
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