Positive corona inception voltages and corona currents for air at various pressures and humidities

Bian, Xingming; Wang, Liming; MacAlpine, J.M.K.; Guan, Zhicheng; Hui, Jianfeng; Chen, Yong

doi:10.1109/tdei.2010.5412003

Cited by 70 publications

(33 citation statements)

References 23 publications

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“…21,22 An unified expression for evaluating the positive dc corona onset can be achieved by introducing a geometric factor. [23][24][25] The effective photon wavelength responsible for photoionization also can be considered based on the classic corona onset criterion. [26][27][28] However, the self-sustained conditions with photoionization for the positive dc corona plasmas between coaxial cylinders have not been clearly clarified before.…”

Section: Introductionmentioning

confidence: 99%

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Zheng

Zhang

2015

Physics of Plasmas

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The positive dc corona plasmas between coaxial cylinders in air under the application of a self-sustained criterion with photoionization are investigated in this paper. A photon absorption function suitable for cylindrical electrode, which can characterize the total photons within the ionization region, is proposed on the basis of the classic corona onset criteria. Based on the general fluid model with the self-sustained criterion, the role of photoionization in the ionization region is clarified. It is found that the surface electric field keeps constant under a relatively low corona current, while it is slightly weakened with the increase of the corona current. Similar tendencies can be found under different conductor radii and relative air densities. The small change of the surface electric field will become more significant for the electron density distribution as well as the ionization activity under a high corona current, compared with the results under the assumption of a constant surface field. The assumption that the surface electric field remains constant should be corrected with the increase of the corona current when the energetic electrons with a distance from the conductor surface are concerned.

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Section: Introductionmentioning

confidence: 99%

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Zheng

Zhang

2015

Physics of Plasmas

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“…Supposing there exists a free electron on negative conductor, it would develop into initial electron avalanche in direction of outer electrodes. When the initial electron avalanche develops to l p , the number N (l p ) of electron avalanche is [32]:…”

Section: Corona Starting Processmentioning

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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“…In the following other figures, the effective value of AC voltage is taken. The data of the positive and negative DC corona inception voltages in the Figure 2 are taken from references [10][11]. The AC corona inception voltages decrease with the rise of humidity.…”

Section: Ac Corona Inception Voltage Related To Pressure and Hummentioning

confidence: 99%

“…Hence, the positive space charges from the former electron avalanches move to the place far away from anode when the free electrons appear. Meanwhile, the average density of positive space charges decreases, as the recombination between cations and electrons or anions increases in wet air [10]. Therefore, the electric field near the anode which is little affected by positive space charges may recover to corona inception electric field easily, and then the corona discharge occurs massively.…”

Section: Amplitudes-phases Distribution Of Ac Corona Pulsementioning

confidence: 99%

Influence of pressure and humidity on the amplitude — Phase distribution of AC corona pulse

Meng

Hui

Mei

et al. 2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Corona problem is one of the important problems in the design and operation of the transmission lines. The corona discharge of high voltage transmission lines, results in power loss, radio interference and audible noise, which become more serious at the high altitudes. Besides, it has a great influence on the safe and robust operation of high voltage apparatus. A study carried out in the chamber made of perspex, was that AC corona characteristics varied with air pressure and humidity through the rod plane electrodes. The experiments showed that the inception voltage of AC corona was reduced with air pressure decreasing or humidity increasing. Meanwhile, the amplitude -phase distribution of AC corona pulse was displayed under different air pressure and humidity. Under low humidity (RH=25% or 55%), the streamer pulses only appear in the rise edge of positive half cycle, and the number of streamer pulses is few. The negative streamer pulses occur around the peak value of the negative half cycle. The streamer pulses appear in the rise and fall edge of positive half cycle at the same time with high humidity (RH=85%), and the number of streamer pulses increases obviously. When the humidity is higher (RH=95%), the streamer pulses appear only in the fall edge of positive half cycle. Furthermore, the negative streamer pulses around the peak of the negative half cycle also disappear.

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Positive corona inception voltages and corona currents for air at various pressures and humidities

Cited by 70 publications

References 23 publications

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

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

Influence of pressure and humidity on the amplitude — Phase distribution of AC corona pulse

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Positive corona inception voltages and corona currents for air at various pressures and humidities

Cited by 70 publications

References 23 publications

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

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

Influence of pressure and humidity on the amplitude &#x2014; Phase distribution of AC corona pulse

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Influence of pressure and humidity on the amplitude — Phase distribution of AC corona pulse