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The Effect of High-Frequency Arc Conditioning of the Electrodes on Electric Strength of Vacuum Insulation

The effect of increasing the electrical strength of the vacuum insulation of the gaps with electrodes made from contact material CuCr (∼ 30% Cr), widely used in vacuum circuit breakers, is studied when they are conditioned by a vacuum arc of alternating current modulated by high-frequency oscillations. The modulating component stimulates a periodic break in the arc and its initiation in new places, which contributes to efficient processing of the entire surface of the electrode pair. In addition, when a high-frequency arc burns, the voltage drop on the electrodes increases substantially, which leads to alternate surface treatment of both electrodes by intense high-energy charged-particle fluxes. With this treatment, there is a special cleaning and local surface melting regime, leading to an effective increase of the electrical strength of the vacuum gaps.