3 results about "Cathode spots" patented technology

The invention relates to the technical field of metallurgy, discloses a direct-current power supply arc stability control method based on a submerged arc furnace, and solves the problems of logic limitation and insufficient matching in the prior art. The instantaneous value and the change rate of the arc resistance are calculated by collecting arc voltage, arc current and electrode position signals in real time; constructing a cathode spot drift feature recognition model, and extracting a high-frequency fluctuation component of 10kHz-100kHz in the instantaneous value of the resistance to be matched with a preset feature spectrum so as to recognize a drift state; voltage and current compensation values are generated by adopting a model prediction control algorithm introducing a drift coefficient, and output parameters of the direct-current power supply are cooperatively adjusted and controlled in combination with multiple dimensions. The control method provided by the invention can accurately capture and inhibit the specific cathode spot drift of the direct current arc, reduce the arc fluctuation and arc breaking phenomena, improve the smelting stability, and reduce the invalid energy consumption and electrode loss, and is suitable for the arc stability control of the direct current power supply of the submerged arc furnace.

This invention relates to the field of plasma numerical simulation technology, and particularly to a method for improving the simulation accuracy of multi-cathode spot jets in vacuum arcs. The technical solution includes the following steps: model construction, building a three-dimensional particle-fluid hybrid simulation model, which includes an ion particle mesh module, an electron fluid module, and an electromagnetic field solution module; time iteration, employing a predictor-corrector algorithm to construct a self-consistent time-domain propagation process, wherein, within a time step, based on the particle information and electromagnetic field information at the current moment, a half-time step propagation of the magnetic field is executed sequentially. This invention achieves efficient, accurate, and stable three-dimensional simulation of multi-cathode spot jet processes in vacuum arcs while ensuring high physical fidelity, significantly reducing computational costs, improving iteration accuracy and computational efficiency, and providing a standardized basis for parameter selection.

This invention discloses a copper-chromium-tellurium alloy strip, comprising Cr, Te, P, Cu, and unavoidable impurities, with the sum of the mass percentages of all elements being 100%, wherein Cr: 0.05~0.50 wt%, Te: 0.05~0.50 wt%, and P: 0.001~0.020 wt%. The copper-chromium-tellurium alloy strip comprises a matrix and a second phase, the second phase being a chromium-tellurium intermetallic compound with an average size of 0.5~3.0 μm. This invention, by controlling the Cr and Te content and the size of the chromium-tellurium intermetallic compound, alters the distribution of cathode spots under arc erosion, thereby improving the arc erosion resistance of the copper-chromium-tellurium alloy, making the copper-chromium-tellurium alloy strip suitable for preparing vacuum switch contact materials.