Simulation Analysis Based on Finite-Difference Time-Domain Algorithm for GIS Partial Discharge Detection

2013 ◽  
Vol 397-400 ◽  
pp. 2282-2286
Author(s):  
Qiu Ping Liu ◽  
Xu Hong Wang
Keyword(s):  
Time Domain ◽  
Electromagnetic Waves ◽  
Simulation Analysis ◽  
Detection System ◽  
Partial Discharge ◽  
Power Grids ◽  
Detection Technology ◽  
Global Power ◽  
Different Characteristics ◽  
Difference Time

Gas insulated switchgear (GIS) has been widely used in global power grids currently. However, there are several disadvantages of GIS which will cause partial discharge (PD) in the insulation and then make GIS shut down. In this paper, the application of the ultra high frequency (UHF)method for partial discharge monitoring is discussed in detail, including the placement of the UHF sensors , detection system and the different characteristics of the different defects in the PD signals diagram are analyzed as well. Finally, some relevant conclusions are drawn based on Finite-Diffrenee Time-Domain algorithm (FDTD) for simulation of the electromagnetic waves by UHF PD detection technology.

Study of EM Wave Propagation for Transformer PD Monitoring Using FDTD Method

2012 ◽  
Vol 614-615 ◽  
pp. 1153-1157
Author(s):  
Ming Jun Liu ◽  
Yang Lin Li ◽  
Qiu Kuan Zhou ◽  
Nian Ping Yan ◽  
Jian Zhang Zou
Keyword(s):  
Wave Propagation ◽  
Time Domain ◽  
High Frequency ◽  
Finite Difference Time Domain ◽  
Partial Discharge ◽  
Fdtd Method ◽  
3D Models ◽  
Transformer Oil ◽  
Transformer Insulation ◽  
Difference Time

Ultra high frequency (UHF) partial discharge (PD) detection technique is drawing attention to transformer insulation accident prevention. However, the configuration of a large oil-immersed transformer is very complicated, so the reflection, refraction and absorption phenomena between PD sources and UHF sensors need to be considered. The phenomena make it difficult to calibrate the magnitude and locate the source of a PD activity. Therefore, detailed investigation of EM wave propagation inside the tank is carried out to enhance the performance of UHF method. Numerical simulations are performed on the 3D models using finite difference time domain (FDTD) method. From the results, the effects of transformer oil, cores and the tanks are clarified.

scholarly journals Study on the Plasmonic Properties of Ag-Coated Spherical Dielectric Nanoparticles by Finite-Difference Time-Domain Calculations

2021 ◽  
Author(s):  
Qing-Wei Sun ◽  
Qi Sun ◽  
Qing-Yu Zhang ◽  
Nan Zhou ◽  
Xi-Na Li
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Electromagnetic Waves ◽  
Incident Light ◽  
Plasmonic Resonance ◽  
Ag Nps ◽  
Zno Nps ◽  
Infrared Band ◽  
Difference Time

Abstract The optical properties of nanostructures are rather important for designing plasmonic devices. In this work, the plasmonic properties of Ag-coated spherical dielectric nanoparticles (NPs), namely, Ag-SiO2-NPs, Ag-ZnO-NPs, and Ag-TiO2-NPs, were studied using a method of finite-difference time-domain calculations. It was found that the Ag-coated dielectric NPs start to exhibit unique plasmonic properties different from Ag-NPs as the thickness of Ag shells is reduced to be less than a critical value, which is basically determined by the penetration depth of light in silver. On the other hand, the core-shell structures of Ag-coated dielectric NPs were found to be of benefit to the plasmonic resonance high-efficiently coupled with the incident light. In the extinction spectra of Ag-coated dielectric NPs with sufficient thin Ag shells, the dipole plasmonic resonance is predominant and exhibits a pronounced red-shift up to infrared band with increasing the NP sizes. In addition to the electromagnetic waves of emission towards the outside, the electromagnetic field in the dielectric NP inside is uniformly enhanced as well and both of dipole and quadrupole plasmonic resonances are identified. The Ag-coated dielectric NPs are suggested to have great potential in the plasmonic devices working in infrared band, such as the light emitters and SERS substrates for biosensing.

scholarly journals Theoretical Study of Negative Material Bias Index Symptoms

2020 ◽  
Vol 2 (1) ◽  
pp. 7-14
Author(s):  
Tuaraja Simbolon
Keyword(s):  
Refractive Index ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Electromagnetic Waves ◽  
Theoretical Study ◽  
Negative Refractive Index ◽  
Theoretical Research ◽  
Bias Index ◽  
Negative Material ◽  
Difference Time

Theoretical research on the phenomenon of negative refractive index materialwas cunducted. The material is a known metamaterial that can manipulate electromagneticwaves through it. By changing the permeability and permittivity of a medium that is worthimaginary, then the value is included in the equation will produce a refractive index that isnegative. This value can be achieved through material forms are designed so that themagnetic field and electric field manipulation. The equation used on electromagnetic wavesthat Maxwell's equations, is revealed to be some similarities propagation magnetic field andelectric field. The Methods Finite Difference Time Domain (FDT D) as a modifier equationwas then equations analysis, simulated using MatlabR2014 program. Based on simulationresults, visible when the electromagnetic waves through a material metamaterial, the wavesare deflected, do not pass part of the material covered.

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