scholarly journals Research on Leakage Current Waveform Spectrum Characteristics of Artificial Pollution Porcelain Insulator

2021 ◽  
Vol 9 ◽  
Author(s):  
Chunhua Fang ◽  
Yuning Tao ◽  
Jianguo Wang ◽  
Haixin You ◽  
Yan Cui ◽  
...  
Keyword(s):  
Leakage Current ◽  
Phase Difference ◽  
Transmission Lines ◽  
Power Transmission ◽  
High Amplitude ◽  
Surface Discharge ◽  
Power Transmission Lines ◽  
Pollution Flashover ◽  
Development Processes ◽  
Porcelain Insulators

The surface discharge development processes of polluted porcelain insulators for power transmission lines are tightly related with the development of leakage current (LC), the characteristics of LC, the insulating condition, and discharge intensity of the insulator surface have an important significance for revealing the contamination discharge state of insulators. In order to analyze the LC characteristics of porcelain insulators in the process of pollution flashover, artificial pollution flashover tests on porcelain insulators were conducted in the artificial fog cabinet, and the characteristics of LC waveforms in time-domain and frequency-domain were simultaneously measured and analyzed during the tests. The results indicated that the amplitude of LC, fundamental harmonic, the third harmonic, and fifth harmonic had a strong correlation, the maximum of LC(Im), the rate of total harmonics (THD), and the phase difference of fundamental harmonic (θ) were used for the representation of the characteristics of the LC waveform. The LC has the characteristics of high amplitude, low proportion harmonic, and small phase difference between the fundamental harmonic and voltage before the flashover occurrence. The test results provide effective reference for porcelain insulators in pollution flashover forecasting.

scholarly journals Adaptive Neurofuzzy Inference System-Based Pollution Severity Prediction of Polymeric Insulators in Power Transmission Lines

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
C. Muniraj ◽  
S. Chandrasekar
Keyword(s):  
Leakage Current ◽  
Transmission Lines ◽  
Power Transmission ◽  
Severity Index ◽  
Power Transmission Lines ◽  
Anfis Model ◽  
Inference System ◽  
Severity Prediction ◽  
Polymeric Insulators ◽  
Adaptive Neurofuzzy Inference System

This paper presents the prediction of pollution severity of the polymeric insulators used in power transmission lines using adaptive neurofuzzy inference system (ANFIS) model. In this work, laboratory-based pollution performance tests were carried out on 11 kV silicone rubber polymeric insulator under AC voltage at different pollution levels with sodium chloride as a contaminant. Leakage current was measured during the laboratory tests. Time domain and frequency domain characteristics of leakage current, such as mean value, maximum value, standard deviation, and total harmonics distortion (THD), have been extracted, which jointly describe the pollution severity of the polymeric insulator surface. Leakage current characteristics are used as the inputs of ANFIS model. The pollution severity index “equivalent salt deposit density” (ESDD) is used as the output of the proposed model. Results of the research can give sufficient prewarning time before pollution flashover and help in the condition based maintenance (CBM) chart preparation.

scholarly journals Synthesis and characterization of hydrophobic nano-silica thin coatings for outdoor insulators

2020 ◽  
Vol 14 (1) ◽  
pp. 40-46
Author(s):  
Khashayar Beirami ◽  
Saeid Baghshahi ◽  
Mohammad Ardestani ◽  
Nastaran Riahi
Keyword(s):  
Leakage Current ◽  
Transmission Lines ◽  
Power Transmission ◽  
Diffraction Method ◽  
Hydrophobic Surface ◽  
Ethanol Solution ◽  
Silica Layer ◽  
Power Transmission Lines ◽  
Hydrophobic Coating ◽  
Current Test

The hydrophobic characteristics of outdoor insulator surface have significant influence on the lifetime and performance of the power transmission lines. In this research, a textured silica layer was dip-coated on the surface using a tetraethyl-orthosilicate (TEOS) containing solution in order to create a hydrophobic surface. Subsequently, the created coating was modified by dipping it in an octadecyl-trichloro-silane/ethanol solution to decrease its surface energy. The coating was characterized by field emission scanning electron microscopy, X-ray diffraction method, Fourier-transform infrared spectroscopy and atomic force microscopy. The microstructural studies confirmed the formation of a uniform microstructure with the mean particle size of 19 nm and roughness of less than 80 nm. The results demonstrated that by creating the hydrophobic coating, the contact angle increased from 14 to 120?. The result of leakage current test at 10 kV showed that the leakage current of the coated insulator was about 24.4 ?A, while that of the non-coated one was about 32 ?A. The adhesion strength of the coating was 1.7MPa.

METHOD OF SYNTHESIS OF CLOSED-LOOP SYSTEMS OF ACTIVE SHIELDING MAGNETIC FIELD OF POWER TRANSMISSION LINES

2016 ◽  
Vol 2016 (4) ◽  
pp. 8-10 ◽  
Author(s):  
B.I. Kuznetsov ◽  
◽  
A.N. Turenko ◽  
T.B. Nikitina ◽  
A.V. Voloshko ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transmission Lines ◽  
Closed Loop ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Closed Loop Systems ◽  
Active Shielding

scholarly journals Time-Multiplexed Self-Powered Wireless Current Sensor for Power Transmission Lines

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1561
Author(s):  
Hao Chen ◽  
Zhongnan Qian ◽  
Chengyin Liu ◽  
Jiande Wu ◽  
Wuhua Li ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Current Measurement ◽  
Current Sensor ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Current Sensing ◽  
Self Powered

Current measurement is a key part of the monitoring system for power transmission lines. Compared with the conventional current sensor, the distributed, self-powered and contactless current sensor has great advantages of safety and reliability. By integrating the current sensing function and the energy harvesting function of current transformer (CT), a time-multiplexed self-powered wireless sensor that can measure the power transmission line current is presented in this paper. Two operating modes of CT, including current sensing mode and energy harvesting mode, are analyzed in detail. Through the design of mode-switching circuit, harvesting circuit and measurement circuit are isolated using only one CT secondary coil, which eliminates the interference between energy harvesting and current measurement. Thus, the accurate measurement in the current sensing mode and the maximum energy collection in the energy harvesting mode are both realized, all of which simplify the online power transmission line monitoring. The designed time-multiplexed working mode allows the sensor to work at a lower transmission line current, at the expense of a lower working frequency. Finally, the proposed sensor is verified by experiments.

scholarly journals Decentralized Estimation of Two-port Equivalents for Power Transmission Lines

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Vedanta Pradhan ◽  
O. D. Naidu ◽  
Sinisa Zubic ◽  
Patrick Cost
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Decentralized Estimation
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