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This paper presents grounding design for shielded packages to obtain high shielding effectiveness at low cost. Shielded packages are required for high-speed LSIs in mobile handsets and should have not only shield layers with high conductivity but also ground pattern arrangement on interposers. While arranging a ground area on an interposer is indispensable for high shielding effectiveness, a large...
According to the present development of the grounding resistance testing system, the paper designs a new multi-functional inverter grounding resistance meter based on BF504 chip. It's forward channel acquisition circuit to get information of the grounding resistance by testing terminals and clamp mouth, using AD7942 chips to get real-time data of voltage and current; after data processing by DSP to...
The Grounding system is very important for the normal operation of the power system and the safety of the equipment and human. The Grounding resistance is the main parameter of the Grounding system, and the measurement of which is the important reference for judging whether the Grounding system is efficient. The paper firstly introduces the concept of the grounding system and its alien frequencies...
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.
This work presents the behavior study of a simulated grounding system using Simulink/Matlab. First, a soil was modeled, then a grounding grid was added and measurements were done. Two different configurations were compared. This paper is the first step of a prototype that measures soil resistivity and grounding impedance in energized substations. This project is a utility application of power electronics.
On the basis of comparison and analysis of the present grounding fault monitoring methods such as method of AC injection, method of DC leakage and so on, this paper points out their shortcomings in practical applications. A novel method named method of different frequency signals for detecting grounding fault of DC system is advanced, which can overcome the bad influence of distributed capacitor between...
The objective of this paper is to study the effect of earth resistance value toward radiated emission and conducted emission performance. The relation will be found if the noise of the equipment is dependent on the earth grounding of the system. The optimum earth resistance value will be identified in order to reduce the radiated emission and conducted emission noise level. This paper consists of...
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