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The objective of this paper is to determine minimum arcing interruption performance of a 126 kV single-break vacuum circuit breaker with 3/4 coil-type axial magnetic field (AMF) contacts. The full contact gap was 50 mm. A spring type mechanism was used to provide an average opening velocity of 3.0 m/s within 20 mm after contacts separation. Test duty T100s experiment with a rated short circuit current...
The objective of this paper is to optimize a 3/4 coil-type axial magnetic field (AMF) contact design used for 126 kV vacuum interrupter. Through central composite design and finite element calculation, axial magnetic field characteristics and loop resistance of the contact system with various design parameters were obtained. Four contact parameters including coil width w, coil height h, air gap width...
A well-known method of low voltage DC current interruption is to increase the arc voltage to exceed the electric source voltage. The objective of this paper is to experimentally determine DC vacuum arc voltage characteristics subjected to an external applied transverse rotating magnetic field. In the experiments, the DC arc current was in a range from 100A to 200A. A Transverse rotating magnetic field...
The objective of this paper is to determine optimal contact parameters of a 126 kV horseshoe type axial magnetic field (AMF) vacuum interrupter. By a combination of three design methods, including design of experiment (DOE) method, finite elements method and statistical analysis method, the optimal AMF characteristics of the contacts were determined by single factor analysis and orthogonal regression...
The objective of this paper is to investigate how strong the axial magnetic field (AMF) is needed for a 126kV vacuum interrupter at different contact gaps. The AMF was generated by a pair of 2/3 coil AMF contacts. First, the accuracy of the three-dimensional finite element simulation of AMF was validated by an AMF measurement at contact gap 30mm. After that high-current switching experiments with...
Vacuum circuit breakers (VCBs) are widely used to protect medium-voltage (MV) power distribution circuits. Since SF6 gas is specified as a global warming gas, VCBs are stepping into a higher voltage sector to protect power transmission circuits. Axial magnetic field (AMF) contacts are widely used in vacuum interrupters. In this paper, we propose a concept of critical radius of AMF contacts. When coil...
We proposed a new kind of coil type axial magnetic field (AMF) contact for 126 kV single break vacuum interrupters (VIs). The objective of this paper is to analyze and optimize AMF characteristics of the new contact. Compared with a former coil type AMF contact with 2 segments we developed, the new AMF contact is advantage with stronger AMF and lower electrode resistance. Its AMF characteristics were...
Seven contact parameters of cup type axial magnetic field (AMF) are used to study magnetic field characteristics by orthogonal design method. The characteristics include axial magnetic flux density, phase shift time and conductor resistance of contacts. Orthogonal experiments are done by three dimensions finite element method. Significant parameters and insignificant parameters that influence the...
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