High Altitude Effect on Corona Inception Voltages of DC Power Transmission Conductors Based on the Mobile Corona Cage

Bian, Xingming; Wang, Liming; Liu, Yunpeng; Yang, Yunlei; Guan, Zhicheng

doi:10.1109/tpwrd.2013.2258818

Cited by 45 publications

(13 citation statements)

References 8 publications

(9 reference statements)

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“…In DC systems, the corona inception voltage for positive polarity is lower than that for negative polarity, thus positive polarity determines the criterion to design transmission line insulation [64]. Bian et al [65] conducted DC corona tests of both polarities of a four-conductor square bundle of conductors using an outdoor corona cage with defined ground planes under various atmospheric pressures. Two types of conductors were tested, with outer diameters 23.76 and 27.63 mm 2 and surface roughness factors m = 0.895 and 0.891, respectively.…”

Section: Conductors Of Circular Cross Sectionmentioning

confidence: 99%

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: Conductors Of Circular Cross Sectionmentioning

confidence: 99%

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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“…Based on the previous researches, a linear correction method is preferred if the altitude is more than 3800m [4]. The well corona shielding performance could be predicted when the electric field calculation result satisfies the relational expression E cal < E "c = E Oc k "…”

Section: A Corona Tests At Diff Erent Altitudesmentioning

confidence: 99%

“…In the previous researches on altitude correction of DC corona inception [4], the transmission line was the focus of attention, whose outer contour is quite different from the shielding structure of quadrivalve. Meanwhile, the large size, complex structure and hybrid AC-DC operating voltage of quadrivalve make the prototype test much costly in high altitude area.…”

Section: A Corona Tests At Diff Erent Altitudesmentioning

confidence: 99%

“…The curves between photon counting rate and applied voltage were plotted. Then based on the "tangent method" applied in [4], the corona inception voltages of all the test electrodes were obtained.…”

Section: A Corona Tests At Diff Erent Altitudesmentioning

confidence: 99%

“…E he V ile E Oe V Oe (4) where E"e and EOe is the maximum surface E-field strength of electrode under the applied voltage V"e and VOc-Since corona is driven by the surface electric field, they could be regarded as the critical values of corona inception E-field strength at different altitudes and the result could be utilized in electric field evaluation of quadrivalve [6]. According to (3), the altitude correction formula for electric field is that…”

Section: Electric Field Evaluation For Quadrivalvementioning

confidence: 99%

See 2 more Smart Citations

Electric field evaluation of ±400kV converter quadrivalve corona shields in high altitude area

Wang

Deng

et al. 2014

2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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The converter quadrivalve is one of the key devices in a ±400kV converter station valve hall at an altitude of 3820m in western China. The complex structure of quadrivalve may lead to serious electric field distortion when without well-designed shields. Besides, in view of high altitude, corona discharge is easier to occur, which threatens the secure operation of HVDC system. In this paper, the structure of ±400kV converter quadrivalve is introduced. A 3-D electric field calculation model of three quadrivalves with corona shields was built with the finite element method (FEM) analysis software ANSYS. Considering the influences of hybrid AC-DC operating voltages, the FEM transient electric field analysis with discrete loading voltage waveform is adopted. The distributions of potential and electric field on quadrivalve corona shields were calculated in a period under normal operating condition. A series of DC corona tests on typical electrodes were carried out at different altitudes in order to obtain the altitude correction formula for DC corona inception electric-field (E-field) strength. The correction formula is determined through the statistical analysis of test results, which provides a reference for the electric field evaluation. Based on the FEM calculation results, the maximum surface E-field strength on the quadrivalve corona shields in the ±400kV valve hall is lower than the critical value. Hence it can be concluded that the design of the corona shields satisfies the external insulation and electromagnetic environment requirements in high altitude area under normal operating condition.

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Structural optimization of grading rings on composite insulators on 500‐kV compact transmission lines

Xie

Peng

Zhou

et al. 2014

IEEJ Transactions Elec Engng

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Serious corona discharges occur on some grading rings of 500‐kV compact transmission lines in China owing to defects in the structural design. The noise of the corona is heard clearly even 50 m away from the tower. In order to solve this problem, we have optimized the structure of the grading rings to suppress the corona. In this study, the grading rings that had serious corona discharges were identified and observed with an ultraviolet imager (UVI), and the electric field (E‐field) distributions of the grading rings were calculated by means of the three‐dimensional finite element method. Based on an analysis of the areas on the grading ring where excessive high E‐field magnitudes were observed, we optimized the structures of the grading rings to improve the field distributions on their surfaces. Based on the optimization suggestions, new grading rings were manufactured to replace the old ones. UVI observations showed that the new grading rings could effectively prevent the occurrence of corona discharge. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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High Altitude Effect on Corona Inception Voltages of DC Power Transmission Conductors Based on the Mobile Corona Cage

Cited by 45 publications

References 8 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

Electric field evaluation of ±400kV converter quadrivalve corona shields in high altitude area

Structural optimization of grading rings on composite insulators on 500‐kV compact transmission lines

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High Altitude Effect on Corona Inception Voltages of DC Power Transmission Conductors Based on the Mobile Corona Cage

Cited by 45 publications

References 8 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

Electric field evaluation of &#x00B1;400kV converter quadrivalve corona shields in high altitude area

Structural optimization of grading rings on composite insulators on 500‐kV compact transmission lines

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Electric field evaluation of ±400kV converter quadrivalve corona shields in high altitude area