Long Term Audible Noise and Radio Noise Performance of American Electric Power's Operating 765 KV Lines

Kolcio, N.; Placido, J. Di; Haas, Rabea; Nichols, David K.

doi:10.1109/tpas.1979.319358

Cited by 24 publications

(5 citation statements)

References 7 publications

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“…According to American BPA's formula, the difference between the value of L 50 of AN during rainy days and fair weather is 25 dB [5]. The results of AEP's 765-kV transmission line showed that the average AN during rainy days was 17 to 19 dB higher than that in fair weather [20]. Through the corona cage test, the South African Electric Power Company considers that the L 50 value of fair weather is lower than that of rainy days by 20 dB [3].…”

Section: Calculation Difference Between Rainy Days and Fair Weathermentioning

confidence: 99%

“…Then AEP made a statistical analysis of the AN of 765-kV lines operating at different voltages and compared those with the Apple Grove 750-kV test line. The results showed that the average AN during rainy days was 17to19 dB higher than that in fair weather [20]. In addition, scholars from other institutions in the United States, Canada, and Korea also measured the AN of 765 and 735-kV transmission lines in their own countries [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…These lines are generally located in plain and low-altitude areas, and the AN was mainly measured in the one-octave band, with the pure-tone effect not analyzed. Except that the Korean 765-kV transmission line uses the same 6-bundle conductor as our country, the others are 4bundle conductors [19][20][21][22][23]. Bonneville Power Administration (BPA, United States) has conducted long-term tests on AN and RI of two 500-kV double-circuit transmission lines with an altitude of 1935 and 277 m, and then compared the difference of statistical values to study the altitude correction method [24].…”

Section: Introductionmentioning

confidence: 99%

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Audible noise analysis of 750‐kV AC transmission line in high‐altitude area under different weather

Zhang

Xu²,

Li³

et al. 2023

IET Generation Trans & Dist

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In order to build UHV AC transmission lines at high altitudes, it is necessary to analyze the audible noise (AN) characteristics of the existing EHV transmission lines at high-altitude areas to guide the design. The typical test data of AN for 750-kV single-circuit transmission lines measured at the Guanting long-term observation station, located at an altitude of 1854 m, were collected. Two methods of sorting the test data of AN and extracting valid data were given. Then the levels of AN under different weather conditions were analyzed, which showed that AN was raised with the increase of instantaneous rainfall and snowfall. Typical frequency spectrums of AN under different weather were also obtained, the pure tone at 100 Hz was more prominent under rainy and snowy weather, and the pure-tone oscillation attenuated at different positions. The statistical results and the calculated difference of AN over 5.5 h with continuous rainfall were obtained. For the 750-kV transmission line in the quiet plateau areas, the calculated difference between AN during rainy days and fair weather can be taken as 25 dB, and the calculated value of the altitude correction coefficient of 2.85 dB/1000 m is better consistent with the measured value.

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Section: Calculation Difference Between Rainy Days and Fair Weathermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Audible noise analysis of 750‐kV AC transmission line in high‐altitude area under different weather

Zhang

Xu²,

Li³

et al. 2023

IET Generation Trans & Dist

View full text Add to dashboard Cite

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“…In the past decades, Kolcio et al. from the American Electric Power Service Corporation conducted AN measurements for 750‐kV power lines over a four‐year period; they studied the AN spectral characteristics under both rainy and fair weather conditions in 1979 [20]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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“…[1][2][3] The electromagnetic environment will be affected by audible noise (AN), radio interference (RI), and corona loss, which occurred by corona. [4][5][6][7] Rain drops play an important role in transmission line corona discharge, especially in foul weather. The electric field will be deformed in the vicinity of the conductor owing to the existence of rain drops, [8][9][10][11] and the shape of rain drops is not kept in a fixed geometry with a definite vertical angle and is disrupted by the interaction of electrostatic force and the surface tension of the liquid drops.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rain Drops on Corona Discharge in Alternating Current Transmission Lines with a Corona Cage

Chen

Bian

Wang

et al. 2012

Jpn. J. Appl. Phys.

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The dielectric distributed around the surface of electrodes has a significant effect on the corona discharge. Corona discharge in power transmission lines in fine weather is different from that in rainy days as the surface condition is greatly changed. The surface of conductors is filled with the drops of rainwater; hence, the electric field around the conductors will be distorted. The use of a corona cage is an effective and economical means for duplicating corona progress in power transmission lines with lower voltage on the conductor in the cage. The practical conductor was utilized in this experiment under both fine and rainy conditions. The process of corona discharge was recorded and investigated. It was found that the corona discharge turned to be much more intense when rain drops were enlarged and more compressed around the conductor. The corona inception voltage, which is an important parameter of corona discharge, was also gained using an ultraviolet imager (UV imager). The corona inception voltage under the rainy condition was about 25% lower than that under the fine condition. The results of the comparison of audible noise and radio interference were analyzed.

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Long Term Audible Noise and Radio Noise Performance of American Electric Power's Operating 765 KV Lines

Cited by 24 publications

References 7 publications

Audible noise analysis of 750‐kV AC transmission line in high‐altitude area under different weather

Audible noise analysis of 750‐kV AC transmission line in high‐altitude area under different weather

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

Effect of Rain Drops on Corona Discharge in Alternating Current Transmission Lines with a Corona Cage

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