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Axial magnetic field (AMF) characteristics of coil type AMF vacuum interrupters are analyzed by 3D finite element method. Seven contact parameters are taken into account in this paper. Analysis results show that: (1) Axial magnetic flux density decreases with increase of contact diameter, coil height, and gap distance. Axial magnetic flux density is not sensitive to coil thickness. So is contact plate...
Magnetic characteristics of axial magnetic field (AMF) of four kinds of vacuum interrupter contacts are studied with 3D finite element method, which included axial magnetic flux density, eddy current in contact plates and phase shift time between AMF and source current. Four AMF vacuum interrupter contacts are studied, which include coil type, cup type, bipolar type and quadrapolar type. The results...
This paper introduces a new slot type axial magnetic field (AMF) contact. It has lower resistance compared with its counterpart conventional one by introducing a contact bridge that substitutes for stainless steel support in conventional contact. There is a gap between the contact bridge and contact plate. In close position, the contact bridge is pressed on contact plate by contact force and coil...
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...
Magnetic field characteristics of vacuum interrupter with cup type axial magnetic field (AMF) contacts where an iron ring is introduced are investigated by three dimensions finite element method. The results show that 1) Axial magnetic flux density at current peak increases greatly on iron area, while it decreases slightly on center area. With increase of gap distance, AMF keeps unchanged on non-iron...
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