A ims . A kind of two levels self-integrating capacitive voltage divider is designed to online measure high voltage nanosecond pulse. Methods. The circuit principle of capacitive divider is analyzed, and the theoretical voltage ratio is calculated. The calibration is carried out by using a low voltage pulse source. The divider with a primary voltage divide ratio 601 has been tested to frequency response exceed 1GHz. The second voltage divide ratio can be set flexibly using different ratio attenuators according to the different voltage level of the source. Result. Finally, this divider is used in measuring 600kV high voltage pulse source, and the experimental results show that the present coaxial capacitive divider is reliable and satisfactory for the measuring requirement in time domain and frequency domain.
This paper introduces a method to adjust the gap distance of nanosecond gas switch from outside when it is filled with high pressure gas. By using a two-stage planetary gear train and a pinion-and-rack device the gap between the electrodes can be linearly adjusted. The adjusting precision is 0.05 mm and adjustment range is 0 to 10 mm. The sealing of the insulator ring, rotation axle and outside conductors is designed. The performance of the rotation axle is pretty well under 12MPa gas pressure, air leakage not found. Experimental study on switch discharging is carried out by using a high voltage nanosecond pulse generator. The results show the output voltage of the pulse can reach 600kV by adjusting the switch gap. The rise-time of the pulse can be shortened form 3.5ns to 1ns.
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