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Centralna tehniška knjižnica Univerze v Ljubljani (CTK)
  • Corona noise comparison of the standard and surface treated conductors obtained with monitoring of the newly erected 400 kV line and with corona testing in high-voltage laboratory [Elektronski vir]
    Rozman, Igor, 1976- ...
    Slovenian TSO has erected a new 80 km long 400 kV double circuit overhead transmission line (OTL) Bericevo - Krsko fitted with standard horizontal twin-bundle conductor 490-AL1/64-A20SA horizontally. ... In two sections, a pilot installation of glass pearl surface treated conductors was used. The latter's surface is more hydrophilic and its corona noise level is expected to be lower in wet conditions. With the purpose of quantifying the aspired and expected audible noise (AN) reduction of the hydrophilic conductors, the two on-site measurement sites were carefully selected. The chosen on-site measurement positions were located under the standard conductor and under the hydrophilic conductor in close enough proximity to assume that, the atmospheric conditions were approximately the same. The standard conductor span was located in a forest while the hydrophilic conductor span near residential buildings, fields and roads. The audible noise measurements were done in all local weather conditions (during dry weather, at high levels of air humidity, during rain (different intensities), before, and after the rain). Noise levels produced by falling raindrops were relatively high and hindered the recognition of corona noise. When the intensity of the falling rain is high, the corona noise and the raindrops contribute to overall captured noise. Because of this reason, the measured noise levels are divided into intervals before the rain and immediately after. Due to the measurement position near the residential area and roads, we carried out measuring and compared the measured results obtained mostly during night-time. The simple reason was that at night-time the background noise is much lower than the produced corona noise in wet conditions. The paper presents the corona audible noise measurement results obtained on-site during October 2013 and October 2014. We identified audible noise intervals in different environmental conditions e.g. before rain, after rain and during rain at different intensity rates. After the on-site measurement was achieved similar conditions were reproduced, as good as it was possible, in the high-voltage laboratory (HVL), on a single-phase conductor bundle mock. Comparison was made based on the equivalent conductor surface electric field intensity (Conductor Surface Gradient). We strived to gain insight into the correlation between corona influencing conditions (voltage, temperature and rain intensity) and audible noise produced by corona. The existing empirical corona noise models (BPA, IREQ etc.) are evaluated using on-site and high-voltage laboratory test results.
    Vir: Set of papers [Elektronski vir] (Str. 1-10)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2016
    Jezik - angleški
    COBISS.SI-ID - 38701573

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