| 摘要 |
PURPOSE:To detect a reduction in degree of vacuum certainly with no attenuation in an optical fiber by detecting a light by a discharge caused on either of the fixed side or the movable side in the leaf initial time of the reduction in degree of vacuum by means of a fluorescent resin member provided on the outer circumference of a glass insulating cylinder. CONSTITUTION:When the degree of vacuum of a vacuum interrupter 1 placed in a system cable way is reduced, a discharge is started in a first vacuum gap l1 between an intermediate shield 2 and a fixed electrode bar 4a. This discharge light is converted into a fluorescent light injected to a linear fluorescent resin 45a and injected to an optical fiber, where the total reflection is repeated, and supplied to the terminal A of a detector 47. The detector 47 supplies a signal to a break instruction part 48, the instruction part 48 gives an alarm to the output and judges a reduction in degree of vacuum. As the discharge light is converted into the fluorescent light in the fluorescent resin part, no attenuation is caused in the optical fiber, and the reduction in degree of vacuum can be certainly detected. |
