研究目的
To present an innovative shunt design for current measurements at 10 A up to 1 MHz with improved magnitude deviation from DC and phase angle according to the frequency.
研究成果
The geometry and structure of a 10 A current shunt have been presented, showing that δ does not exceed 25 ppm up to 1 MHz. The modelling results at 100 kHz compared to existing current shunt standards demonstrate the performances of the new proposed shunt.
研究不足
The study focuses on a theoretical approach and modelling results, without presenting experimental validation of the shunt's performance.
1：Experimental Design and Method Selection:
The study involves the design and electromagnetic modelling of a 10 A shunt with characteristics of δ smaller than
2：2 ppm at 100 kHz and 25 ppm at 1 MHz. Two different approaches were carried out:
3D electromagnetic simulations using the CST Microwave Studio software and an analytic approach.
3：Sample Selection and Data Sources:
The proposed current shunt is composed of a resistive disk and a coaxial line made up of an inner conductor and an outer conductor (shielding). The material of the resistive disk is typically Evanohm (copper alloy).
4：List of Experimental Equipment and Materials:
The shunt includes two N-Type connectors welded to the inner conductor at both sides of the coaxial line, a solid resistive circular disk with a uniform thickness and drilled in its center, and different dielectric substrates tested: Macor (εr = 5.7), Boron Nitride (εr = 4.3) and Shapal (εr = 7.3).
5：7), Boron Nitride (εr = 3) and Shapal (εr = 3).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The electrical resistance of the shunt is obtained by the use of a solid resistive circular disk connected electrically to the inner and outer conductors. The electromagnetic and thermal responses of the proposed shunt are completely calculable.
6：Data Analysis Methods:
The shunt impedance Zshunt is calculated from the ratio between the open-circuit output voltage U2 and the input current I1 of the shunt, corresponding to the impedance Z21 in the matrix impedance [Z].
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