Complex Diagnostics of Defects in High-Voltage Insulators

Golenishchev-Kutuzov, A. V.; Golenishchev-Kutuzov, V. A.; Иванов, Д. А.; Mardanov, G. D.; Semennikov, A. V.; Vankov, Yuri

doi:10.3103/s1062873819120062

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…The PD signal processing ends with the characteristics display: the amplitude and number of pulses in each phase interval and the distribution of the number of pulses by amplitude. The results of data processing were presented in the following articles [45][46][47].…”

Section: Diagnostics By Electromagnetic and Acoustic Recording Of Pdmentioning

confidence: 99%

“…The obtained phase distribution of pulse parameters is compared with the previously recorded distribution of pulse signal parameters for an identical (defect-free) VI [46]. Since the propagation velocities of electromagnetic and acoustic pulses differ by several orders of magnitude, a phase synchronization unit is used to synchronize them with each specific phase interval (considering the distance between the defect and the sensors).…”

Section: Diagnostics By Electromagnetic and Acoustic Recording Of Pdmentioning

confidence: 99%

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Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

et al. 2021

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The article describes a complex of non-contact methods for remote diagnosis of high-voltage insulators as well as the two-channel method for remote diagnostics of the operating state of high-voltage insulators, based on the registration of partial discharges by electromagnetic and acoustic sensors. The presented device allows visual inspection and searches for faulty high-voltage equipment and a remote non-contact method of recording high-intensity electric fields of industrial frequency and their spatial distribution based on the electro-optical effect. The scheme of using the system for monitoring and diagnosing the technical condition of high-voltage support insulators of open switchgear is described. The results of experimental studies confirm the possibility of industrial applicability of the proposed method for non-contact remote diagnostics of the state of high-voltage insulators under operating voltage.

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Section: Diagnostics By Electromagnetic and Acoustic Recording Of Pdmentioning

confidence: 99%

Section: Diagnostics By Electromagnetic and Acoustic Recording Of Pdmentioning

confidence: 99%

Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

et al. 2021

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“…It is well established by experimental studies and confirmed by simulations [2][3][4][5][6][7][8], that the highest electric field value around an insulating string is found on the last pin in contact with the high voltage conductor, more exactly at the triple junction (pin-cement, cement-porcelain), which also corresponds to the highest thermal point [9], therefore, these areas are very critical in high voltage lines. The presence of high electric field leads to corona discharges by ionizing the surrounding air of the insulator, resulting in energy losses, electromagnetic interferences, visible light, audible noise, and the destruction of materials by erosion [10][11][12]. When the electric field stress exceeds a threshold value, especially in the presence of pollution conditions [13], flashover of the insulator string may occur.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Grey Wolf and Finite Element Method (GWO-FEM) Algorithm for Enhancing High Voltage Insulator String Performance in Wet Pollution Conditions

Doufene

Benharat

Bouazabia

et al. 2022

Eng. Technol. Appl. Sci. Res.

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The presence of wet pollution on the upper surface of a string insulator increases the electric field on the insulator surface, especially at the triple junction (pin-cement, cement-porcelain) as well as at the surrounding air of the insulator. The rise of the electric field leads to the ionization of the air surrounding the insulator. This phenomenon, called corona discharge, is accompanied by several consequences that are harmful to the electricity transmission network, such as electromagnetic interferences, energy losses, visible light, audible noise, and the destruction of materials by erosion. If favorable conditions are gathered, it may even cause the flashover of the insulator. Designing an optimal insulator shape that reduces this electric field value at the triple junction will be an important achievement in enhancing the performance of electrical grids. The objective of this paper is to evolve a hybrid algorithm based on the GWO-FEM for optimizing the shape and the electrical performance of a string insulator. To achieve this purpose, this work is structured in four parts. First, modeling of the insulator string geometry is conducted in Comsol-multiphysics, then FEM computation of the electric field on the polluted surface of the string insulator is completed, and the maximum electric field value at the triple junction is saved as the fitness function that will be sent to the GWO algorithm to be optimized (minimized). The third part of the work is devoted to the coding of the constrained (electrical and geometrical constraints) GWO algorithm in a Matlab interface, and finally, coupling the GWO code with the FEM code. This study is achieved in wet polluted conditions. The results are given in both 2D and 3D representations. From the obtained results we can confirm that the developed GWO-FEM hybrid algorithm for optimizing insulator strings is a very promising tool for designing and enhancing the shape and the electrical performance of insulators.

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“…При заданих діелектричних характеристиках ємність циліндричного конденсатора залежить від товщини ізоляційного прошарку та від довжини електродів: чим тонша ізоляція та чим довші електроди, тим більша ємність [28][29][30][31]. Вочевидь, величина ємності проміжку струмопровід-обкладка (C 0,2 ) зростає безперервно зі збільшенням довжини провідної обкладки, в той же час найбільша ємність С 2,3 проміжку обкладка-фланець практично обмежується осьовою довжиною фланця.…”

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Simulation of the electric field of a polymer bushing in the Ansys Maxwell software environment

Shevchenko,

Danylchenko,

Potryvay

et al. 2022

Bull. Nat. Tech. Univ. "KhPI". Ser.: Energy: Reliab. Energy Eff

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The article analyses the software tools for modelling the maps of the electric field strength of insulators. The need to address this issue is dictated by the fact that the uneven electric field on the insulators increases the probability of partial discharges that destroy the insulating layer, so it is very important to optimize the electric field strength on the insulator. The design features of bushings and features of partial discharges in them are considered. The distribution of electric field strength in a polymer pass-through operating in an AC network without contaminants is considered. The results of modelling the electric field of insulators in the software environment Ansys Maxwell, which is based on the simulation of the finite element method, are presented. Points in the construction of a 35 kV bushing polymer insulator have been identified, where the highest level of electric field strength is concentrated. A method of influencing the area under study in the area of the flange connection to the ground plate is proposed. This defines the use of a conductive cover placed between the flange and the place of connection to the polymeric insulating layer, which significantly improves the overall electric field strength distribution on the surface of the bushing polymer insulator and makes it competitive compared to the most commonly used porcelain bushings, by increasing the electrical strength of the structure. According to the results of research, a means of optimizing the electric field of the pass-through polymer insulator is proposed, which allows to increase its electric resistance and reduce the electric field strength in the area of flange contact with the mounting surface, which in turn prevents premature partial discharges in the insulating bodies.

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Complex Diagnostics of Defects in High-Voltage Insulators

Cited by 10 publications

References 3 publications

Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

Hybrid Grey Wolf and Finite Element Method (GWO-FEM) Algorithm for Enhancing High Voltage Insulator String Performance in Wet Pollution Conditions

Simulation of the electric field of a polymer bushing in the Ansys Maxwell software environment

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