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- W4385668483 abstract "Switching opening operations in vacuum are characterized by an arc, which occurs during mechanical contact separation and is created from vaporized contact material. At low currents it is unstable and can chop before the natural current zero crossing. The result of this transient process is a high current gradient, which can lead to high overvoltage’s e.g. at inductive loads due to resonance phenomena. Damages to the equipment and electromagnetic compatibility (EMC) issues can occur. Contact materials for contactor applications like tungsten carbide silver (WCAg) show a chopping current in the range of 0.7… 2.5 A. Circuit breakers must interrupt high short circuit currents without damaging the contact surface by material erosion. Therefore, zero chopping is not the focus. In circuit breakers the chopping current is between 4 and 6 A with contacts made of copper chromium (CuCr). Different approaches can be used to improve the chopping behavior. The choice of the used contact materials can reduce current chopping or shift it closer to the zero crossing. Lower chopping values with the reduction of transient overvoltage’s at inductive loads are important especially for contactor applications. Therefore, an emission of the contact material at low temperatures is necessary. Another approach is the superposition of an externally applied axial magnetic field during the switching operation. Some publications indicate an influence on the chopping behavior. Thirdly, the switching speed for the selected materials is investigated in more detail. This paper determines both, different contact materials and superimposed axial magnetic fields regarding their chopping behavior. Contact materials comparable to WCAg show a 52% reduction of the chopping current without a superimposed magnetic field. Other materials show a behavior like CuCr. The superimposed magnetic flux density (up to B=200mT) provides higher values for the chopping current with a minimum at approx. B=80mT." @default.
- W4385668483 created "2023-08-09" @default.
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- W4385668483 date "2023-06-25" @default.
- W4385668483 modified "2023-10-16" @default.
- W4385668483 title "Influence of Switching Contact Materials with Superimposed Axial Magnetic Field on the Vacuum Arc’s Chopping Behavior" @default.
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- W4385668483 doi "https://doi.org/10.23919/isdeiv55268.2023.10201116" @default.
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