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真空断路器触头的形状和大小各不相同,关于它们开断能力的系统研究已有报道。各种几何形状的电扳可产生自激的横向或轴向磁场(其强度与电流有关),其开断电流的极限值也因而确定。令人尤感兴趣的是电弧的外观(发散或集中,体现在电弧电压的波形中)、触头的抗腐蚀性能以及电弧运动对灭弧能力的影响。Weil—Dobke 综合试验电路,其最大电流为60kA(有效值),电压状态与20kV 的电力系统相对应。单极开断试验的实验就是应用此线路及一台可拆卸的真空良装置进行的。实验的结果表明:开断能力总的说来随触头直径的增大而提高。横向磁的结构为电弧在整个使用寿命期间保持良好运动状态创造了条件,因而使性能得到改善,但轴向磁场结构的触头所得到的结果最好。
Vacuum circuit breaker contacts vary in shape and size, and systematic studies on their breaking capacity have been reported. Various geometric shapes of the electric wand can produce a self-excited transverse or axial magnetic field (the strength of which is related to the current), and the breaking current limit value is thus determined. Of particular interest are the appearance of the arc (divergent or concentrated, as reflected in the waveform of the arc voltage), the corrosion resistance of the contacts and the effect of arc motion on the arc extinguishing capability. Weil-Dobke synthesis test circuit, the maximum current of 60kA (RMS), the voltage state and 20kV power system corresponds. Unipolar breaking test experiment is the use of this circuit and a removable vacuum device carried out. The experimental results show that the breaking capacity generally increases with the increase of contact diameter. The transverse magnetic structure creates the conditions for the arc to maintain good motions throughout its service life, resulting in improved performance, but the contacts of axial magnetic field structures yield the best results.