Novel Spiral-Gap Shielding Shell for a Rogowski Current Sensor

Rogowski current sensors play an important role in detecting the condition of electrical power substation equipment. An electromagnetic field shielding shell is necessary for some of these sensors to operate correctly, especially those with large diameters and small heights. These are used for frequ...

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Bibliographic Details
Published inIEEE transactions on electromagnetic compatibility Vol. 64; no. 4; pp. 1058 - 1066
Main Authors Cheng, Yangchun, Sha, Yufei, Wei, Siyun, Bi, Jiangang, Chang, Wenzhi, Ma, Xianwei
Format Journal Article
LanguageEnglish
Published New York IEEE 01.08.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Current sensor
Diameters
Effectiveness
Electricity substations
Electromagnetic fields
Electromagnetic shielding
Finite element method
Frequency analysis
Frequency response
Interference
Magnetic domains
magnetic field
Magnetic fields
Magnetic noise
Magnetic sensors
Magnetic shielding
Metal shells
Metals
Sensors
Shells
shielding effectiveness
shielding shell
Simulation
spiral gap
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Summary:Rogowski current sensors play an important role in detecting the condition of electrical power substation equipment. An electromagnetic field shielding shell is necessary for some of these sensors to operate correctly, especially those with large diameters and small heights. These are used for frequency-response analysis in power transformers. In this study, the magnetic-shielding effectiveness of a normal C-type metal shell was tested and simulated. The distribution and direction of the magnetic field were analyzed using finite-element simulation calculations to reveal the reasons for its poor shielding effectiveness. It was found that the magnetic field induced by an interference current crosses the shell and enters its cavity through the gap in its inner wall. Shells with larger inner-diameter-to-height ratios have worse magnetic-shielding effectiveness. Therefore, a novel shell structure with a spiral gap is proposed here. The magnetic-shielding effectiveness of this new type of shell was analyzed by further simulations and verified in experimental tests. The results showed that a shell with a spiral gap has better shielding effectiveness when it has a long gap. In addition, the spiral gap was found not to inhibit the current-measurement function of the sensor. This provides a new approach to the design of electromagnetic shielding shells for Rogowski sensors.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2022.3157164