Effects of air pressure and humidity on the corona onset voltage of bundle conductors

Hu, Qin; Shu, Lei; Jiang, Xinyang; Sun, Chao; Zhang, Shaoting; Shang, Yunlong

doi:10.1049/iet-gtd.2010.0560

Cited by 19 publications

(16 citation statements)

References 7 publications

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“…Experiments conducted in bundle conductors at different pressures and air humidities indicate that the corona inception voltage decreases notably with the reduction of air pressure but this effect weakens with the increase of absolute air humidity when it is within 5-15 g/m 3 , that is, when there is no condensation on the conductors' surface. However, when the absolute humidity is about 17.3 g/m 3 , water drops due to condensation distort the surface electric field thus triggering a sudden drop of the corona inception voltage [58].…”

Section: Environmental Conditionsmentioning

confidence: 99%

“…According to results conducted in an artificial chamber by Hu et al [58,62], the relationship between corona inception voltage U c,RMS and air pressure p for AC bundle conductors can be expressed as:…”

Section: Conductors Of Circular Cross Sectionmentioning

confidence: 99%

“…where U c,RMS and U c0,RMS are, respectively, the corona inception voltage in kV RMS at a given air pressure p, and at standard air pressure p 0 , and m an exponent within the range 0.59-0.91 depending on the bundle configuration and the absolute air humidity [58]. Similarly, when there is no condensation on the conductors' surface, a suitable relationship between the corona inception voltage U c,RMS and air humidity h a can be expressed as:…”

Section: Conductors Of Circular Cross Sectionmentioning

confidence: 99%

“…where h a and h a,0 being, respectively, the measured absolute air humidity and the standard air humidity in g/m 3 , and n an exponent within the range 0.038-0.190 depending on the bundle configuration and the pressure of air [58]. Tests conducted in a climate chamber varying the relative air density δ within the interval 0.55-0.95 using a smooth copper tube with outer diameter 19 mm suggested that the relation between corona inception voltage U c,RMS and δ for AC conductors can be expressed as [21]:…”

Section: Conductors Of Circular Cross Sectionmentioning

confidence: 99%

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Voltage Correction Factors for Air-Insulated Transmission Lines Operating in High-Altitude Regions to Limit Corona Activity: A Review

Riba

Larzelere²,

Rickmann

2018

Energies

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Nowadays there are several transmission lines projected to be operating in high-altitude regions. It is well known that the installation altitude has an impact on the dielectric behavior of air-insulated systems. As a result, atmospheric and voltage correction factors must be applied in air-insulated transmission systems operating in high-altitude conditions. This paper performs an exhaustive literature review, including state-of-the-art research papers and International Standards of the available correction factors to limit corona activity and ensure proper performance when planning air-insulated transmission lines intended for high-altitude areas. It has been found that there are substantial differences among the various correction methods, differences that are more evident at higher altitudes. Most high-voltage standards were not conceived to test samples to be installed in high-altitude regions and, therefore, most high-voltage laboratories are not ready to face this issue, since more detailed information is required. It is proposed to conduct more research on this topic so that the atmospheric corrections and altitude correction factors found in the current International Standards can be updated and/or modified so that high-voltage components to be installed in high-altitude regions can be tested with more accuracy, taking into account their insulation structure.

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Section: Environmental Conditionsmentioning

confidence: 99%

Section: Conductors Of Circular Cross Sectionmentioning

confidence: 99%

Section: Conductors Of Circular Cross Sectionmentioning

confidence: 99%

Section: Conductors Of Circular Cross Sectionmentioning

confidence: 99%

See 2 more Smart Citations

Voltage Correction Factors for Air-Insulated Transmission Lines Operating in High-Altitude Regions to Limit Corona Activity: A Review

Riba

Larzelere²,

Rickmann

2018

Energies

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“…However, most papers neglect the importance of the energized icing, so there are some differences between practice and theory. Moreover, there has been no in-depth analysis of how charged icing influent the COV [12]. The formula of corona onset field obtained by Peek via many tests in 1929, but some environmental factors ignored in the expression [13], so there are some difference between calculation and engineering application [14,15].…”

Section: Introductionmentioning

confidence: 99%

Study on the influence of charged glaze on the corona onset voltage of bundle conductor

Chen

Jiang

Shu

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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Glaze grows on the conductor surface will affect corona onset voltage (COV). Wires iced under voltage is often neglected and scaled models always adopted to study the actual bundle conductors, there is no lights have been thrown into the downtrend of COV during charged icing. AC corona tests of iced bundle conductors implemented in the Multifunction Climate Chamber, the UV imaging camera and I-U curve fitting applied to analyze the COV. Finite element models of iced conductor established to discuss how the glaze icicles affect electric field. Results show that glaze cut the COV down greatly. Different icicle morphology leads to distinct COV values. With more sub-conductors, bundle conductor gets higher COV in the same icing time. With the Increase of icing time, COV decreases with the rate slow down. Higher conductivity has no effect on morphology but reduces the COV. Sharper icicles lead to more seriously field distorted and lower COV values. This paper provides reference for selection and designation of transmission line in glaze icing areas.

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Investigation of High Altitude/Tropospheric Correction Factors for Electric Aircraft Applications

Mermigkas

Clark

Haddad

2019

Lecture Notes in Electrical Engineering

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Effects of air pressure and humidity on the corona onset voltage of bundle conductors

Cited by 19 publications

References 7 publications

Voltage Correction Factors for Air-Insulated Transmission Lines Operating in High-Altitude Regions to Limit Corona Activity: A Review

Voltage Correction Factors for Air-Insulated Transmission Lines Operating in High-Altitude Regions to Limit Corona Activity: A Review

Study on the influence of charged glaze on the corona onset voltage of bundle conductor

Investigation of High Altitude/Tropospheric Correction Factors for Electric Aircraft Applications

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