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Since GIS bushings are keeping the conducting lines being insulated from the ground and decreasing the intensified electric field strength, its safe and reliable operation are extremely important. However, the complicated structure and high electric field strength are making the structural optimization of bushings necessary. In this paper, the basic principles and process of the newly-presented artificial...
The compact design has become the development direction of power distribution switchgear equipment. As a key element of the power distribution switch, the electric field of high voltage bushing was concentrated. In order to enhance the overall reliability of the distribution switchgear, the insulation structure of the bushing needed to be optimized. This paper constructed the three-dimensional finite...
Object: For realizing the Finite Element (FE) analysis of real human head electromagnetic distribution induced by Trans-cranial Magnetic Stimulation (TMS), a complex human head FE model containing seven organizational structures, i.e. scalp, skull, cerebrospinal fluid (CSF), grey matter, white matter, cerebellum and eyeballs, was established, with the distribution of conductivities, and hence the...
Silicone rubber makes composite insulators show excellent moisture dirt performance because of its hydrophobicity. In the wet environment, separated water droplets instead of continuous water film will form on the surface of composite insulators, helping curb the occurrence of arc in high-strength field. However, separated water droplets will distort the electric field easily leading to the partial...
Benchmark results for electromagnetic scattering from large cavity structures are very important in developing efficient simulation tools for real cavity design. This paper focuses how to apply our in-house parallel higher order finite element-boundary integral (FE-BI) code to efficiently simulate EM scattering from large cavities. The results obtained can serve as benchmark data with very good accuracy...
During the operation of a HVAC bushing, there exists E-field distortion at the edge of the aluminum foils where the edge effect enhances E-field. To figure out the operating performance of a bushing, it's essential to analyze the distribution of E-field at the edge of foils. In this paper, computing and experimental researches are conducted to analyze the edge effect. We first investigate a 2-D model...
With the development of nanotechnology and Micro-Electro-Mechanical System (MEMS) technology, micro-pores films are widely applied in the fabrication of important components of nano-devices and MEMS. It is found that micro-pores films have the effect on the separation of the two-phases and the fix of the phase interfaces, due to huge network structures and highly ordered distribution of pore structure...
Effects of retention groove location and dimensions of threaded glass fiber post on the maximum retention force of the restorative system and the maximum equivalent stress in the root were numerically investigated. Results show that the retention groove can effectively enhance retention ability and reduce the stress in the root. And the maximum retention force of the restorative system can be increased...
The structure of traditional machine tool is designed through experience, analogy, and static traditional design method. The machine structure was heavy and design cycle is long. So the cost is expensive. Therefore, there are a lot of places need improvements. The finite element model of the beam structure was structured by using three-dimensional CAD modeling software-UG NX4.0 and finite element...
A finite element-boundary integral method with higher-order element (FEBI-HOE) code has been developed at Temasek Laboratories @ NUS for modeling interior scattering from 3-D cavities with complex terminations. In this paper, we present a small-grained parallelization of the FEBI-HOE code to decrease the execution time and to enhance its capability in simulating very large cavity models. To make implementation...
Extrusion process of a large diameter thin-walled aluminum profile was simulated by FEM based on Deform-3D software. The results show that the material flow velocity in the bearing exit of the original designed die is non-uniform. Three times modifications were performed and simulated. The optimal design with more uniform flow velocity in the bearing exit was obtained.
In sandstorm condition, sand particles with different size collide with each other, resulting in electrification of sand particles and a strong electric field will form. When the charged sand particles move to the neighborhood of line insulators, they will impact the external insulation performance of line insulators. In this paper, electric field distribution of composite insulators with the existence...
In this paper, by using finite element analysis (FEA) and boundary element analysis (BEA), the potential distribution of 500 kV gapless MOA on power lines is calculated. Considering towers, power lines, grading rings and etc, the position and size of grading rings are adjusted to optimize the structure. The results of FEA and BEA numerical calculation indicate that the resistor of MOA at the line...
In this paper, a new-style insulator structure is presented against the erosion and aging phenomenon of composite insulators. The middle parts of the new-style insulators are composite insulators and the two terminals are porcelain insulators. The results of simulative calculation and structural optimization indicate that this new assembled structure of composite insulators and porcelain insulators...
Converting transformer bushing is the key equipment to develop the ultra-high voltage power transmission project. The electric field distribution in the bushing is correlative to resistivity, temperature and etc. Especially, the electric field distribution relatively centralizes on the bushing outlet terminal for its complex structure. In this paper, finite element analysis (FEA) is used to calculate...
In this paper, the finite element method is used to calculate the three-dimensional electric-field distribution of long-rod post porcelain insulators used in 1000 kV system. The electric-field distribution is simulated in the condition of varied position, varied major radius and varied section dimension of the shielding ring. The effect of these factors to the external insulation characteristics of...
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