Pollution Severity Diagnose on Solid Insulators using the Partial Discharge and Flashover Characteristics

In this paper deals with the investigation of partial discharge and flashover characteristics of the ceramic and non-ceramic insulators in order to succeed a best diagnostic tool to determine the pollution severity of exterior insulators. In this experiment, laboratory based tests are achieve on the ceramic and non-ceramic insulators under AC voltage at various pollution levels manipulate the sodium chloride (NaCl) a as contaminant. Initially the test are conducted by the pure and contaminated at sample of insulators. In supplement, Partial discharge (PD) occurs on the contaminated surface of the sample insulator is to be measured and to investigate the PD wave form. The PD detection is sufficient to analyze maintenance of insulators of the transmission line. To evaluate the statistical analysis of PD patterns in order to accomplish a numerical judgment of pollution severity of the ceramic and non-ceramic insulators. In consequence, ceramic and non-ceramic insulator exhibit the pollution severity of the exterior insulators should be recognized from the partial discharge patterns investigation.

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Time-frequency analysis of VHF wave form for precise location of partial discharge in small-scale high voltage apparatuses

Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417) ◽

10.1109/icpadm.2003.1218422 ◽

2004 ◽

Author(s):

C.K. Lee ◽

Y. Muramoto ◽

N. Hozumi ◽

M. Nagao

Keyword(s):

Frequency Analysis ◽

High Voltage ◽

Partial Discharge ◽

Small Scale ◽

Wave Form ◽

Precise Location ◽

Time Frequency Analysis ◽

Time Frequency

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Effects of Flash Sintering Parameters on Performance of Ceramic Insulator

Energies ◽

10.3390/en14041157 ◽

2021 ◽

Vol 14 (4) ◽

pp. 1157

Author(s):

Yong Liu ◽

Xingwang Huang

Keyword(s):

Grain Size ◽

Electric Field ◽

Field Intensity ◽

Current Density ◽

Electric Field Intensity ◽

Unit Cell ◽

Uniform Structure ◽

Ceramic Insulator ◽

Flash Sintering ◽

Ceramic Insulators

Ceramic outdoor insulators play an important role in electrical insulation and mechanical support because of good chemical and thermal stability, which have been widely used in power systems. However, the brittleness and surface discharge of ceramic material greatly limit the application of ceramic insulators. From the perspective of sintering technology, flash sintering technology is used to improve the performance of ceramic insulators. In this paper, the simulation model of producing the ceramic insulator by the flash sintering technology was set up. Material Studio was used to study the influence of electric field intensity and temperature on the alumina unit cell. COMSOL was used to study the influence of electric field intensity and current density on sintering speed, density and grain size. Obtained results showed that under high temperature and high voltage, the volume of the unit cell becomes smaller and the atoms are arranged more closely. The increase of current density can result in higher ceramic density and larger grain size. With the electric field intensity increasing, incubation time shows a decreasing tendency and energy consumption is reduced. Ceramic insulators with a higher uniform structure and a smaller grain size can show better dielectric performance and higher flashover voltage.

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