Three-dimensional modelling of electric-arc development in a low-voltage circuit-breaker

2008 ◽  
Vol 51 (19-20) ◽  
pp. 4973-4984 ◽  
Author(s):  
L. Piqueras ◽  
D. Henry ◽  
D. Jeandel ◽  
J. Scott ◽  
J. Wild
Keyword(s):  
Low Voltage ◽  
Circuit Breaker ◽  
Three Dimensional ◽  
Electric Arc

scholarly journals 2D NUMERICAL SIMULATION OF MAGNETIC FIELD IN LOW-VOLTAGE CIRCUIT BREAKER

2020 ◽  
Vol 20 (4) ◽  
pp. 1049-1060
Author(s):  
ELENA OTILIA VIRJOGHE ◽  
MIHAIL FLORIN STAN ◽  
COSMIN COBIANU ◽  
NICOLAE FIDEL
Keyword(s):  
Magnetic Field ◽  
Power Distribution ◽  
Low Voltage ◽  
Physical Phenomenon ◽  
Circuit Breaker ◽  
Ferromagnetic Material ◽  
Electric Arc ◽  
The Finite Element Method ◽  
Splitter Plates ◽  
And Control

Low Voltage Circuit Breakers is used for the switching process in power distribution and control system. This process is accompanied by the occurrence of the electric arc between the fixed and mobile contact pieces of the apparatus. The electric arc is introduced into the quenching chamber formed of ferromagnetic iron splitter plates, divided into short arcs and then the arc may extinguish after passing the current through zero. Behavior of the electric arc in the extinguishing chamber influences the performance of these devices, the ferromagnetic material leading to the improvement of these performances. This article presents the calculation of the magnetic field components in the extinguishing chamber of the low-voltage circuit breaker of the 2000 A, 690 V manufactured by Schneider Electric and to describe the physical phenomenon and mathematical calculation of the electric arc in LVCB. The Ansys Multiphysics program is used to determine the spectrum of magnetic field components. This program is based on the finite element method for solving Maxwell equations.

scholarly journals Experimental Temperature Measurements in Miniature Circuit Breaker

2017 ◽  
Vol 4 (3) ◽  
pp. 265-268
Author(s):  
D. Simek ◽  
D. Pecek
Keyword(s):  
Spectral Data ◽  
Main Part ◽  
Low Voltage ◽  
Circuit Breaker ◽  
Electric Arc ◽  
Experimental Temperature ◽  
Radiation Spectra ◽  
Data Source ◽  
Atomic Lines ◽  
Voltage Switching

Low voltage switching apparatuses efficiency depends on the speed of movement of the switching arc from the contacts to the quenching chamber. The paper is focused on investigation of this movement of an arc. Measurement of radiation spectra of the electric arc burning inside miniature circuit breaker and moving to quenching chamber are presented. Measured radiation spectra contain suitable atomic spectra lines for calculation purposes. The problems connected with the measurements are discussed. The main part of the paper deals with a calculation of temperature of the investigated plasma of the arc. Atomic lines database of National Institute of Standards and Technology was used as a spectral data source for the calculations.

Optical and magnetic diagnostics of the electric arc dynamics in a low voltage circuit breaker

2002 ◽  
Vol 13 (7) ◽  
pp. 1146-1153 ◽  
Author(s):  
C Brdys ◽  
J P Toumazet ◽  
A Laurent ◽  
J L Ponthenier
Keyword(s):  
Low Voltage ◽  
Circuit Breaker ◽  
Electric Arc ◽  
Magnetic Diagnostics

scholarly journals Analysis of Turn-to-Turn Fault on Split-Winding Transformer Using Coupled Field-Circuit Approach

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1314
Author(s):  
Cunxiang Yang ◽  
Yiwei Ding ◽  
Hongbo Qiu ◽  
Bin Xiong
Keyword(s):  
Low Voltage ◽  
Short Circuit ◽  
Three Dimensional ◽  
Great Influence ◽  
Normal Operation ◽  
Transient Field ◽  
Axial Forces ◽  
Leakage Field ◽  
Characteristics Analysis ◽  
Split Winding

The turn-to-turn faults (TTF) are also inevitable in split-winding transformers. The distorted leakage field generated by the TTF current results in large axial forces and end thrusts in the fault windings as well as affecting other branch windings normal operation, so it is of significance to study TTF of split-winding transformers. In this paper, the characteristics analysis of the split-winding transformer under the TTFs of the low voltage winding at different positions are presented. A 3600 KVA four split-windings transformer is taken as an example. Then, a simplified three-dimensional simplified model is established, taking into account the forces of the per-turn coil. The nonlinear-transient field-circuit coupled finite element method is used for the model. The leakage field distribution under the TTFs of the low voltage winding at different positions is studied. The resultant force of the short-circuit winding and the force of the per-turn coil are obtained. Subsequently, the force and current relationship between the branch windings are analyzed. The results show that the TTF at the specific location has a great influence on the axial windings on the same core, and the distorted leakage magnetic field will cause excessive axial force and end thrust of the normal and short-circuit windings. These results can provide a basis for the short-circuit design of split-winding transformer.

Fast Throughput Low Voltage Scanning Transmission Electron Microscope Imaging of Nano-Resolution Three Dimensional Tissue

2009 ◽  
Vol 15 (S2) ◽  
pp. 642-643
Author(s):  
M Bolorizadeh ◽  
HF Hess
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Low Voltage ◽  
Three Dimensional ◽  
Scanning Transmission Electron Microscope ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Microscope Imaging ◽  
Electron Microscope Imaging ◽  
Voltage Scanning

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

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