A Streamer Model for High Voltage Water Switches
NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD
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An electrical switch model for high voltage water switches has been developed which predicts streamer-switching effects that correlate well with water-switch data from Casino over the past four years and with switch data from recent AuroraAMP experiments. Preclosure rounding and postclosure resistive damping of pulseforming line voltage waveforms are explained in terms of spatially-extensive, capacitive- coupling of the conducting streamers as they propagate across the gap and in terms of time-dependent streamer resistance and inductance. The arc resistance of the Casino water switch and of a gas switch under test on Casino was determined by computer fit to be 0.5-0.1 ohms and 0.3-0.06 ohms respectively, during the time of peak current in the power pulse. Energy lost in the water switch during the first pulse is 18 of that stored in the pulseforming line while similar energy lost in the gas switch is 11. The model is described, computer transient analyses are compared with observed water and gas switch data and the results - switch resistance, inductance and energy loss during the primary power pulse - are presented.
- Electrical and Electronic Equipment