Research on Lightning Current Sensor Coil Based on Lightning Space Magnetic Field

2018 ◽  
Vol 67 (8) ◽  
pp. 1922-1928 ◽  
Author(s):  
Hongwei Mei ◽  
Shi Yan ◽  
Chenlong Zhao ◽  
Liming Wang
Keyword(s):  
Magnetic Field ◽  
Current Sensor ◽  
Lightning Current ◽  
Sensor Coil

scholarly journals Calculation of Transient Magnetic Field and Induced Voltage in Photovoltaic Bracket System during a Lightning Stroke

2021 ◽  
Vol 11 (10) ◽  
pp. 4567
Author(s):  
Xiaoqing Zhang ◽  
Yaowu Wang
Keyword(s):  
Magnetic Field ◽  
Time Derivative ◽  
Equivalent Circuit Model ◽  
Magnetic Flux Density ◽  
Induced Voltage ◽  
Lightning Stroke ◽  
Transient Magnetic Field ◽  
Lightning Current ◽  
Time Space ◽  
The Magnetic Field

An effective method is proposed in this paper for calculating the transient magnetic field and induced voltage in the photovoltaic bracket system under lightning stroke. Considering the need for the lightning current responses on various branches of the photovoltaic bracket system, a brief outline is given to the equivalent circuit model of the photovoltaic bracket system. The analytic formulas of the transient magnetic field are derived from the vector potential for the tilted, vertical and horizontal branches in the photovoltaic bracket system. With a time–space discretization scheme put forward for theses formulas, the magnetic field distribution in an assigned spatial domain is determined on the basis of the lightning current responses. The magnetic linkage passing through a conductor loop is evaluated by the surface integral of the magnetic flux density and the induced voltage is obtained from the time derivative of the magnetic linkage. In order to check the validity of the proposed method, an experiment is made on a reduced-scale photovoltaic bracket system. Then, the proposed method is applied to an actual photovoltaic bracket system. The calculations are performed for the magnetic field distributions and induced voltages under positive and negative lightning strokes.

Electrical conductivity identification of a carbon fiber composite material plate using a rotating magnetic field and multi-coil eddy current sensor

2018 ◽  
Vol 83 (2) ◽  
pp. 20901 ◽  
Author(s):  
Ahmed Chaouki Lahrech ◽  
Bachir Abdelhadi ◽  
Mouloud Feliachi ◽  
Abdelhalim Zaoui ◽  
Mohammed Naїdjate
Keyword(s):  
Magnetic Field ◽  
Neural Networks ◽  
Electrical Conductivity ◽  
Composite Material ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Rotating Magnetic Field ◽  
Current Sensor ◽  
Carbon Fiber Composite ◽  
Fiber Composite Material

This paper proposes a contactless method for the identification of the electrical conductivity tensor of a carbon fiber composite materials plate using a rotating magnetic field and multi-coil eddy current sensor. This sensor consists of identical rectangular multi-coil, excited by two-phase sinusoidal current source in order to generate a rotating magnetic field and to avoid the mechanical rotation of the sensor. The fibers orientations, the longitudinal and transverse conductivities in each ply of carbon fiber composite material plate were directly determined with analysis of the impedance variation of each coil as function of its angular position. The inversion process is based on the use of artificial neural networks. The direct calculation associated with artificial neural networks makes use of 3D time-harmonic finite element method based on the A, V–A formulation.

Sensor of Current or Magnetic Field Based on Magnetoresistance Effect in (La0.7Ca0.3)0.8Mn1.2O3 Manganite Film

2009 ◽  
Vol 154 ◽  
pp. 157-161 ◽  
Author(s):  
V.P. Dyakonov ◽  
S. Piechota ◽  
K. Piotrowski ◽  
A. Szewczyk ◽  
H. Szymczak ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Short Circuit ◽  
Operation Time ◽  
Electric Circuit ◽  
Current Sensor ◽  
Detectable Change ◽  
Magnetoresistance Effect ◽  
Manganite Film ◽  
Current Value ◽  
A Current

The main objective of the performed investigations was to enhance sensitivity of a current sensor to weak changes of magnetic field. New design of the sensor of current based on magnetoresistance effect – MRE (MRE = (RH - R0)/R0 , where RH is the resistance in magnetic field and R0 is the resistance without magnetic field) was developed. The sensor was produced in the form of an annular magnet with a gap, in which the (La0.7Sr0.3)0.8Мn1.2О3 manganite film possessing large negative MRE was inserted. Nominal current in a controllable electric circuit can change from a few tenths parts of ampere to a hundred of amperes. The limit detectable change of current value depends on the size of gap in the annular magnet. The operation time of sensor at current overload and short circuit is less than 0.3 sec. These magnetoresistors are thermally stable over the temperature range from (- 50 ° С) to (+ 50 ° С). Proposed sensors based on MRE can be applied in many electrical arrangements and devices.

Compact Design of a Wide Bandwidth High Current Sensor Using Tilted Magnetic Field Sensors

2021 ◽  
Author(s):  
Philipp Ziegler ◽  
Yiru Zhao ◽  
Jorg Haarer ◽  
Johannes Ruthardt ◽  
Manuel Fischer ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Current Sensor ◽  
High Current ◽  
Wide Bandwidth ◽  
Magnetic Field Sensors ◽  
Compact Design ◽  
Tilted Magnetic Field

scholarly journals Magnetic Field Controlled Type Current Sensor

1987 ◽  
Vol 107 (7) ◽  
pp. 673-680 ◽  
Author(s):  
Toshikatsu Sonoda ◽  
Ryuzo Ueda
Keyword(s):  
Magnetic Field ◽  
Current Sensor

scholarly journals Magnetoelectric Vortex Magnetic Field Sensors Based on the Metglas/PZT Laminates

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2810
Author(s):  
Do Thi Huong Giang ◽  
Ho Anh Tam ◽  
Vu Thi Ngoc Khanh ◽  
Nguyen Trong Vinh ◽  
Phung Anh Tuan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Flux Distribution ◽  
Volume Fraction ◽  
Magnetic Sensors ◽  
Current Sensor ◽  
Vortex Center ◽  
Magnetic Field Sensors ◽  
Ring Shape ◽  
Voltage Signal ◽  
New Generation

This paper describes the route, from simulations toward experiments, for optimizing the magnetoelectric (ME) geometries for vortex magnetic field sensors. The research is performed on the base of the Metglas/Piezoelectric (PZT) laminates in both open and closed magnetic circuit (OMC and CMC) geometries with different widths (W), lengths (L), and diameters (D). Among these geometries, the CMC laminates demonstrate advantages not only in their magnetic flux distribution, but also in their sensitivity and in their independence of the position of the vortex center. In addition, the ME voltage signal is found to be enhanced by increasing the magnetostrictive volume fraction. Optimal issues are incorporated to realize a CMC-based ME double sandwich current sensor in the ring shape with D × W = 6 mm × 1.5 mm and four layers of Metglas. At the resonant frequency of 174.4 kHz, this sensor exhibits the record sensitivity of 5.426 V/A as compared to variety of devices such as the CMC ME sensor family, fluxgate, magnetoresistive, and Hall-effect-based devices. It opens a potential to commercialize a new generation of ME-based current and (or) vortex magnetic sensors.

scholarly journals Differential twin receiving fiber-optic magnetic field and electric current sensor utilizing a microfiber coupler

2015 ◽  
Vol 23 (7) ◽  
pp. 9407 ◽  
Author(s):  
Shao-cheng Yan ◽  
Ye Chen ◽  
Cai Li ◽  
Fei Xu ◽  
Yan-qing Lu
Keyword(s):  
Magnetic Field ◽  
Electric Current ◽  
Fiber Optic ◽  
Current Sensor
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