Monitoring device with an optical sensor for the detection of interference arcs in electrical systems
AssigneeBBC Brown, Boveri & Company, Limited
InventorJurgen H. Kuntermann
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Abstract
A monitoring system with an optical sensor for the detection of interference arcs in electrical systems, particularly in enclosed SF.sub.6 -insulated high voltage systems. The system improves the reliability of the sensor by means of a test light impulse supplied from outside the enclosure by examining the exit surface as well as the entry surface on the sensor for the light beam for turbidity by means of a light-diffusing coating on the surface. To that end, the sensor has at least a second photoconductor with an external light source for the production of test light impulses and the test light impulse is led through a portion of the space to be monitored before it enters again into the sensor and the first photoconductor.
Claims10
A monitoring device for the detection of interference arcs in an electrical system, particularly in an enclosed SF.sub.6 -gas-insulated high voltage system, comprising:
- a passive non-metallic optical sensor comprising,
- a transparent protective cylinder defining an axis and having first and second photoconductors arranged in parallel with each other and the cylinder axis, said photoconductors disposed gas-tightly in said system,
- said first conductor provided to lead out of said system light impulses produced by an interference arc,
- an external light source coupled to said second photoconductor for the production of test light impulses to be transmitted through said second photoconductor, and
- means for passing the test light impulses transmitted through said second photoconductor through a portion of the space within said system being monitored and to said first photoconductor, including a collective lens for focusing said test light impulses passed through said portion of said space at said first photoconductor as said test light impulses enter said first photoconductor.
In a monitoring device for the detection of interference arcs in an electrical system, particularly in an enclosed SF.sub.6 -gas-insulated high voltage system, an improved sensor comprising:
- a first photoconductor coupled gas-tightly to said system for leading out therefrom light impulses of an interference arc;
- a light source external to said system for the production of test impulses;
- a second photoconductor having one end coupled to said light source and another end gas-tightly protruding in said system, said second photoconductor having a bent portion within said system such that said another end faces said first photoconductor such that test impulses from said light source are transmitted via said first photoconductor through a portion of the space being monitored within said system and enters directly into said first photoconductor.
Dependencies are inferred from the claim text.