Abstract
Hybrid AC/DC overhead lines offer a significant increase in transmission capacity compared to existing HVAC infrastructure. While corona phenomena and audible noise are crucially important for public acceptance, they are affected by mutual AC/DC coupling. While the underlying phenomena need to be clearly understood and predicted accurately, only few experimental studies exist. The corona effects are therefore studied in detail on a large laboratory setup under the influence of electric field bias, ripple and space charges. The results show a clear trend in the phase resolved partial discharge (PRPD) pattern and repetition rate which can explain the change in audible noise.
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