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Description
The contact gap of open vacuum interrupters (VI) is generally set by the lightning impulse withstand voltage and/or capacitor switching duty. These duties require larger contact gaps than other duties such as interrupting short-circuit current and power frequency withstand voltage. The electron emission from gaps with these dimensions is very small, unless some feature of the duty enhances this emission by roughening the contact surface. However, VI applications that do not require a lightning impulse withstand voltage nor back-to-back capacitor switching can potentially use much smaller contact gaps. These small gaps could generate larger field emission currents when under voltage stress. Experimental work characterized the field emission from 0.5-4 mm gaps between Cu-Cr contacts at DC voltages up to 40 kV. These experiments can quantify the change in behavior over a large number of samples as well as the effect of different mechanical and electrical operations.
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