Measurement of Arc Velocity in a Rotating-Arc Pulsed-Power Switch Based on B-Dot Probes

Abstract

A rotating-arc pulsed-power switch is designed in this paper. In order to realize the arc rotating characteristics, B-dot probes are installed in the switch to measure the arc velocity. Six B-dot probes are installed symmetrically in a circle under the gap to obtain the arc velocity variation with the current. The probe signal is calculated in a simplified model, and the method of velocity calculation is discussed. The theoretical errors of velocity calculation caused by the variation of arc direction are analyzed. The arc velocity is obtained from the experimental probe voltage signals using the probes in different distances, and then, the results are discussed. From the measurements, the arc rotates about 550 m/s at a current of 20 kA.Index Terms-Arc velocity, axial magnetic field, B-dot probe, rotating-arc switch.

Dynamic Characteristics of Transverse-Magnetic-Field Induced Arc for Plasma-Jet-Triggered Protective Gas Switch in Hybrid UHVDC System

“…characteristics resulting from different gap distances, it could also be reasonably poin out that the arc controlling performance of the TMF-based electrode gradually decrea with an increase in the gap distance between the electrodes, and it also indicates tha the electrode itself is designed with better arc controlling capability, then it would oper with a better performance to withstand the operation condition with a larger gap distan From previous studies [33][34][35], it is observed that the faster the arc rotation veloc the better it is controlled under the action of the electrode during the high current ph of an arcing process. From the present work, it is found that the velocity increase indica a larger magnetic flux density, which also correspondingly implies that the designed el trode would be operated with a better arc controlling capability.…”

“…From a comparison of the arc diffusion condition for these t designs of the electrode, it is found from Figure 14 that the electrode with 8 spiral-shap petals has a better arc controlling capability during the whole arc duration since the av age rotation velocity of the arc under the action of the electrode with 8 spiral-shaped pet is also faster, with a value of 196.8 m/s., which could sufficiently control the arc rotat steadily during the high current phase and gradually diffusing towards the computatio edge, especially at the later stage. From previous studies [33][34][35], it is observed that the faster the arc rotation velocity the better it is controlled under the action of the electrode during the high current phase of an arcing process. From the present work, it is found that the velocity increase indicates a larger magnetic flux density, which also correspondingly implies that the designed elec trode would be operated with a better arc controlling capability.…”

“…The total turns for arc rotation are also correspondingly reduced from 25 to 20, 17.5, 17 and 13. Therefore, from the comparative analysis of the arc From previous studies [33][34][35], it is observed that the faster the arc rotation velocity, the better it is controlled under the action of the electrode during the high current phase of an arcing process. From the present work, it is found that the velocity increase indicates a larger magnetic flux density, which also correspondingly implies that the designed electrode would be operated with a better arc controlling capability.…”

Design and Experimental Study of a Current Transformer with a Stacked PCB Based on B-Dot

“…Compared with a normal Rogowski coil, a B-dot coil does not need to pass through the coil [ 17 ]. Most studies based on the B-dot principle focus on high-frequency current measurement (MHz, kA level) by a sensor under the self-integral state, such as in a lightening current and plasma discharge pulse current [ 18 , 19 , 20 , 21 ]. In comparison, only a few studies have examined the performance of B-dot sensors in measuring currents in differential mode.…”