Development of a cesium-vapor-lamp system for triggering photothyristors

Details Development of a cesium-vapor-lamp system for triggering photothyristors Development of a cesium-vapor-lamp system for triggering photothyristors

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gec..rept.....w&link_type=abstract

Final Report General Electric Co., Schenectady, NY. Corporate Research and Development.

Physics

Optics

Cesium Vapor, Energy Conversion, Light Sources, Thyristors, Utilities, Cables (Ropes), Fiber Optics, Luminous Intensity, Mercury Alloys

Scientific paper

A pulsed cesium vapor light source was developed to trigger photothyristors for power conversion applications in electric utility substations. Work on pulsed cesium lamps has yielded promising lamp life and total light output, i.e., one lamp could trigger several hundred thyristors. However, the light intensity that could be delivered to the thyristor gates at the end of 18 m long fiber optic cables was marginal. Rather high pulse currents (2000 A) appeared necessary to reach the goal of 10 times the thyristor threshold intensity. Large increases in effective light output intensity were obtained by advances in the lamp design and by using more efficient fiber optic cables. The cesium amalgam lamps contain mercury in addition to cesium and have a reduce bore to increase the arc intensity. Single fiber, fused silica cables of remarkable efficiency were tested. As a result, 33 times the thyristor threshold intensity at pulse currents of only 300 A were delivered. At such moderate current levels, no fundamental limitations to lamp life in life tests that have reached 40,000 hours (8.5 billion pulses) were found.

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