Modelling of the corona characteristics under damped oscillation impulses

Huang, Kun; Zhang, Xiaoqing; Xiao, Xiang

doi:10.1049/iet-gtd.2015.0903

Cited by 8 publications

(8 citation statements)

References 26 publications

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“…C geo v t ð Þ in Equation (22)) and a non-linear delayed one (i.e. the right side member in Equation (22), except for C geo v t ð Þ). Computational time for results associated with the 15-km line discussed here, Δt ≈ 12 ns, Δx ¼ 4 m, with the fast-front voltage source, was approximately 3 min on a desktop Intel computer.…”

Section: Slow Front Voltage Sourcementioning

confidence: 99%

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The impact of different corona models on FD algorithms for the solution of multiconductor transmission lines equations

2021

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In this study, the implementation of different corona discharge models in a transient program for overhead multiconductor lines based on the implicit Crank‐Nicolson Finite Difference Time Domain method is presented. Among different corona models available in the literature, two empirical models (Gary's and Suliciu's models) and a physics‐based model (Malik's model) are discussed, which are broadly used in EMT programs, and their predictions under fast‐front lightning surges and slow‐front switching impulses are assessed. The authors critically review the dynamic capacitance approach in terms of numerical accuracy, when dealing with slowly varying voltages, and applicability, regarding dispersive models assuming a non‐instantaneous charge‐voltage relation. The alternative voltage‐controlled generator approach is proposed, which is successfully included in the implicit Crank‐Nicolson scheme. One of the objectives of this study is to show how different corona models may predict overvoltages with huge discrepancies, depending on the transient waveform and the propagation distance, despite the similarity of the q‐v hysteresis curves. More evident discrepancies between models under fast‐front voltage waves are reported, rather than for switching impulses. The consistency of these results in terms of the models' features and q‐v curves is analysed, highlighting the necessity for new engineering tools for corona simulation of general predictive capability.

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Section: Slow Front Voltage Sourcementioning

confidence: 99%

“…[17], Cooray [20], Correia de Barros [21], and more recently Huang et al. [22], which account, with different degrees of accuracy, for all the most important mechanisms (i.e. surface charge, space‐charge, time lag, critical electric field, back corona effect etc.…”

Section: Introductionmentioning

confidence: 99%

The impact of different corona models on FD algorithms for the solution of multiconductor transmission lines equations

2021

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“…Physics-based models Correia de Barros [35,[52][53][54] Multi-layer space discretization, solution of drift equations [55] Malik et al [ Expression of the corona over-current [65] CIGRÉ [66] Expression of the corona dynamic capacitance [67] Circuit models Hara and Umoto [68] Voltage-dependent shunt capacitor and resistor [69] Motoyama and Ametani [70] Shunt capacitor and resistor, piece-wise constant functions of the voltage -Maccioni, Araneo et al [71] Voltage-dependent current generator and shunt resistor -…”

Section: Model Features Relatedmentioning

confidence: 99%

The Corona Phenomenon in Overhead Lines: Critical Overview of Most Common and Reliable Available Models

2021

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Research on corona discharge, shared by physics, chemistry and electrical engineering, has not arrested yet. As a dissipative process, the development of corona increases the resistive losses of transmission lines and enhances the line capacitance locally. Introducing additional losses and propagation delay, along the line, non-linearity and non-uniformity of the line parameters; therefore, corona should not be neglected. The present work is meant to provide the reader with comprehensive information on the corona macroscopic phenomenology and development, referring to the most relevant contributions in the literature on this subject. The models proposed in the literature for the simulation of the corona development are reviewed in detail, and sensitivity curves are provided to highlight their dependence on the input parameters.

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“…In fact, most of lightning intruding surges into substations consider the damped oscillation waveshapes rather than the double exponential ones due to refraction and reflection of the surge waves . In view of the actual situation, some efforts were undertaken for measuring the q ‐ u curves under damped oscillation impulses, and a significant difference was found between the q ‐ u curves under double‐exponential and damped oscillation impulses . Nevertheless, the previous work was confined to the single conductor, and the conductor bundles were not involved.…”

Section: Introductionmentioning

confidence: 99%

Measurement of corona characteristics of conductor bundles under negative damped oscillation impulses

Zhang

2019

IEEJ Transactions Elec Engng

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The corona characteristics of the single and bundle conductors are investigated experimentally under negative damped oscillation impulses. The experimental setup consisting of a modified impulse generator, corona cage and digital measurement system is built for measuring the charge–voltage (q‐u) curves. An exploratory experiment is described with special attention to the effect of the number of bundle conductors on the feature of q‐u curves. The behavior of the minor loops on the q‐u curves is examined from a single‐conductor to four‐conductor bundle. In terms of the measured corona inception voltage, the corona inception field strength is evaluated at a critical distance from the inner electrode. The capacitance increase coefficient and energy dissipated by corona are extracted from the measured q‐u curves. Then, a discussion is also presented on these characteristic indices according to the gas discharge mechanism. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Modelling of the corona characteristics under damped oscillation impulses

Cited by 8 publications

References 26 publications

The impact of different corona models on FD algorithms for the solution of multiconductor transmission lines equations

The impact of different corona models on FD algorithms for the solution of multiconductor transmission lines equations

The Corona Phenomenon in Overhead Lines: Critical Overview of Most Common and Reliable Available Models

Measurement of corona characteristics of conductor bundles under negative damped oscillation impulses

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