The length of the air gap in a negative corona discharge, which affects many corresponding parameters in the discharge process, is of vital importance for the physical investigations. A hydrodynamic drift-diffusion approximation model considering photoionization utilizing the finite-element method has been used in needle-to-plane air gaps. Trichel pulses, pulse frequency, electron, and electric field distribution, and surface current density distribution on the anode plate were presented to study the effect of the gap length. An approximate exponential relationship was found to exist between the corona current and the gap length, and also a linear function was found between the pulse frequency and the gap length. The analysis shows that the characteristics of the Trichel pulse are strongly dominated by the length of the air gap.

/pdf/characteristics-of-negative-corona-discharge-in-air-at-fpnbuqyf9b.pdf

Characteristics of negative corona discharge in air at various gaps.

Joint diagnosis and validation of lightning risk for transmission lines by using multisource data

In UHV DC test base of state grid corporation and Tibet high altitude test base, rod-rod gap discharge characteristic tests under the same condition of arrangement are carried out. Positive and negative polarity switching and lightning impulse discharge characteristic curves for rod-rod long air gap under the condition of different elevations are obtained; dispersion of different altitudes rod-rod gap discharge voltage is given; by applying the existing altitude correction methods IEC60060-1 and IEC60071-2 to an altitude of 4300 m, altitude correction coefficients of switching and lightning impulse discharge voltage are calculated; contrast analysis between them and correction coefficients obtained through test results are carried out; applicability of the above two correction methods at an altitude of 4300 m is preliminarily discussed. Results show that disposability of the rod-rod gaps discharge voltage under the same impulse voltage waveform at different altitudes are basically the same, and that the polarity and waveform parameters have a certain impact on the altitude correction factor of the rod-rod gap discharge voltage.

Characteristics and altitude correction of rod-rod long air gap impulse discharge

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Characteristics and altitude correction of rod-rod long air gap impulse discharge