Modification of Transmission Line Audible Noise Spectra to Reduce Environmental Impact

Molino, John A.; Zerdy, Gerald A.; Lerner, Neil; Harwood, Dane L.

doi:10.1109/tpas.1981.316489

Cited by 3 publications

(5 citation statements)

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“…When the corona discharge occurred, the 100‐Hz pure tone amplitude was higher, and in some cases, it was even higher than the equivalent A‐weighted level. These results are similar to the practical long‐term test results reported in previous studies [22, 39]. The different types of weighted sound pressure levels are illustrated in Figure 12 [38].…”

Section: Resultssupporting

confidence: 89%

“…As displayed in Figure 10, the curves of spectral characteristics obtained in this study followed a typical ac corona noise shape, similar to the trends of the measured AN spectra of 500‐ and 750‐kV practical transmission lines at lower altitudes [4, 22].…”

Section: Resultssupporting

confidence: 76%

“…The 1/3-octave band spectral characteristics of the three bundled conductors with E-field strengths in the range of 14-22 kV/cm were compared and analysed as illustrated in Figure 10. As displayed in Figure 10, the curves of spectral characteristics obtained in this study followed a typical ac corona noise shape, similar to the trends of the measured AN spectra of 500and 750-kV practical transmission lines at lower altitudes [4,22].…”

Section: An Spectral Analysis Of Three Bundled Conductorssupporting

confidence: 78%

“…In 1981, researchers from the Bonneville Power Administration (BPA) analysed the octave band spectra for a single 63.6-mm conductor on 500-kV ac lines; they found the pure tone level to be higher than high-frequency noise under rainy conditions [4,21]. Molino et al studied the response of different humans to noise frequency and analysed the frequency spectral characteristics of five EHV ac lines [22]. In recent years, with the development of UHV transmission lines in China, some researchers have measured the AN frequency spectra of 1000-kV power lines.…”

Section: Introductionmentioning

confidence: 99%

“…Molino et al. studied the response of different humans to noise frequency and analysed the frequency spectral characteristics of five EHV ac lines [22]. In recent years, with the development of UHV transmission lines in China, some researchers have measured the AN frequency spectra of 1000‐kV power lines.…”

Section: Introductionmentioning

confidence: 99%

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Audible noise spectral characteristics of high‐voltage ac bundled conductors at high altitude

Wan

Liu

et al. 2020

IET Generation Trans & Dist

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At high altitudes, the corona discharge around a conductor surface is severe, and the induced audible noise (AN) is irritating; this is due to the low air density at high altitudes. Therefore, AN has become a crucial limiting factor in the design of ac power lines of 500 kV or higher at high altitudes. An investigation of the spectral characteristics of AN should help provide a greater understanding of corona noise; however, only a few studies have investigated the spectral characteristics of AN in practical bundled conductors at high altitude. Therefore, it is difficult for power utility companies to select suitable conductors. In this study, the AN spectral characteristics of 6 × LGJ400, 6 × LGJ720, and 8 × LGJ500 bundled conductors were investigated using an ultra‐high‐voltage corona cage (8 × 8 × 35 m) in Xining, Qinghai Province (altitude: 2261 m). The AN equivalent A‐weighted level and the 1/3‐octave frequency characteristics of these three conductors were obtained, and the influence of the electric field (E‐field) on these characteristics was analysed. Subsequently, the relationship between the AN A‐weighted level and the 8‐kHz level was examined. We found that, with the increase of the E‐field, the low‐frequency components of AN level did not exhibit an obvious trend, but in the high‐frequency band (1.6–20 kHz), a clear positive correlation was observed between the spectrum level and E‐field strength. Among these three conductors, the 8 × LGJ500 conductor was the optimal conductor for reducing the AN levels at high altitude. The results obtained in this study can provide a data reference for the construction of high‐altitude ac power lines.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 76%

Section: An Spectral Analysis Of Three Bundled Conductorssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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