Innovation-section: test-run for uprating a 220 kV OHL to 380 kV using insulated cross-arms and coated conductors

Schichler, Uwe; Hadinger, N.; Troppauer, W.; Babuder, Maks; Vižintin, Stane; Reich, Klemens; Leonhardsberger, M.; Schmuck, Frank; Husmann, E.

doi:10.1007/s00502-016-0449-z

Cited by 4 publications

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, most of the existing data was derived from outdoor experiments with typically highly fluctuating rain intensities. However, previous studies have shown that the corona performance will indeed not be constant, but vary over time during transient rain periods [4], [13], [14]. A very important factor for this is the deformation of the water drops in an electric field, with different corona source geometries causing very different corona characteristics [4], [15], [16].…”

Section: Introductionmentioning

confidence: 99%

HVAC Corona Current Characteristics and Audible Noise During Rain

Hedtke

Zhang

et al. 2021

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

Corona Audible Noise is a major factor regarding the public acceptance of overhead lines. In this paper, 2-conductor bundle is used to study the influence of rain on AC corona discharge. Rainfall is simulated by a large rain dispenser, which can be adjusted over a wide range. Using this experimental setup, the transient AC audible noise and corona current pulse characteristics under rainfall condition were studied. It was found that there are three different stages of audible noise level during rain, in which the audible noise level during the steady state stage is the highest. This transient characteristic could be explained by two different types of corona discharges for discharges above and below the conductor. Furthermore, the steady state audible noise level was studied under a wide range of rain rates and applied surface electric fields. It was found that the sensitivity of the audible noise level to the rain rate decreases with the applied electric field. This finding is of vital importance as the rain intensity is regarded as one of the most important factors influencing the HVAC audible noise, and a higher rain rate is usually considered to cause a higher audible noise level. A possible explanation of this phenomenon is attributed to the effect of a "critical number of corona sources", which is well known from DC corona and possible evidence is provided based on long-exposure photos.

show abstract