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In order to solve the engineering construction problem of lightning protection in permafrost regions along the Qinghai-Tibet railway, based on the soil characteristics in plateau permafrost regions, Zhongguang Hi-Tech Industrial Development Group set up an earthing test base in Balang mountain, the permafrost condition of which is very similar to that of Qinghai-Tibet railway. Field tests of reducing...
Through-hole vias made of multiwall carbon nanotubes (MWCNTs) are simulated using the multiconductor and equivalent single conductor models. The circuit approach is developed in order to define an equivalent lumped-parameter SPICE-model. Different expressions of the p.u.l. damping quantum resistance are considered and their impact on the prediction of the via performance at high frequency is discussed...
The SPD disconnectors currently in use are those recommended by manufactures of SPDs. In Europe, fuses are commonly used as SPD disconnectors, on the other hand, in Japan, molded-case circuit breakers (MCCBs) are commonly used. However, the condition regarding SPD disconnectors that the manufacturers use for selecting the appropriate SPD disconnector is not clearly laid out , and standardization has...
In this paper, novel fractal on chip power distribution technique has been developed. The novel structure is designed based on leaf vein. The simulated and measured results illustrate that our physical structure has greatly improved resistive and inductive voltage drop, and noise isolation between the analog and digital circuits.
The line lightning performance of the 33 kV distribution line Tanjung Batu - Rompin gives very bad performance during lightning. The lines have bad performance although they were equipped with the line lightning arrester to limit the overvoltages on the phase conductors when lightning strikes the line. There are several cases where the surge arresters were broken and exploded. In this study, the effect...
This work presents an analysis of the overvoltage in the secondary network caused by lightning discharges that are transferred from the primary through the transformer. Numerical simulations using TLM- Transmission Line Modeling and ATP- Alternative Transients Program are presented to show and to establish comparisons between two models for the grounding resistance of the transformer and customer:...
Lightning caused surge voltages in low-voltage AC power circuits are studied statistically based on the Monte Carlo method in this paper. The finite difference time domain (FDTD) method is used to solve the multi-conductor transmission line equations. A transformer model is incorporated into the FDTD solution. Both direct and indirect lightning strikes are taken into account in the statistical evaluation...
Recently, an electromagnetic radiation decoupler with significant advantages (low profile and simple structure) was proposed for metallic item detection in UHF RFID systems. In this paper the decoupler is investigated by simulation and experiment. Based on the simulation, some new design principles, different from the original principles of the inventors, aimed at optimizing the performance of the...
This paper describes approximate formulas for sending-end voltage and current in a horizontal grounding conductor. The formulas are derived based on the lattice diagram method, and are expressed in time domain. This paper discusses a measurement method for surge impedance of a horizontal grounding conductor using the approximate formulas.
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