Telecommunications gas tube apparatus and composition for...

H - Electricity – 01 – C

Patent

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Details

H01C 7/10 (2006.01) H01B 1/22 (2006.01) H01C 7/12 (2006.01) H01J 17/40 (2006.01) H01T 1/14 (2006.01)

Patent

CA 2191740

A telecommunications gas tube apparatus (40) which is suitable for connection to a gas discharge tube (12) and which comprises an electrically non-linear resistive element (45) prepared from an electrically non-linear composition which comprises a polymeric component and a particulate filler. The composition has an initial resistivity i at 25 ~C of at least 109 ohm-cm, and is such that a standard device containing the composition has an initial breakdown voltage VSi, and after the standard device has been exposed to a standard impulse breakdown test, the device has a final breakdown voltage VSf which is from 0.7VSi to 1.3VSi. In addition, the composition in the device has a final resistivity f at 25 ~C of at least 109 ohm-cm. Such compositions are useful in providing both vent-safe and fail-safe protection to a gas discharge tube (12).

La présente invention concerne un équipement de télécommunications à tube à gaz (40) convenant à un tube à décharge à basse pression (12) et qui comporte un élément résistant électriquement non linéaire (45) préparé à partir d'une composition électriquement non linéaire qui comprend un composant polymère et une masse de remplissage particulaire. A 25 ~C, la composition a une résistivité initiale ?¿i? d'au moins 10?9¿ .OMEGA.-cm, et, si la tension de claquage initiale V¿Si? d'un dispositif standard contenant la composition est V¿Si?, une fois que le dispositif a été soumis à un test standard de claquage par impulsion, sa tension de claquage finale V¿Sf? se situe entre 0,7 V¿Si? et 1,3 V¿Si?. En outre, la composition contenue dans ledit dispositif possède, à 25 ~C, une résistivité finale ?¿f? d'au moins 10?9¿ .OMEGA.-cm. De telles compositions sont utiles pour conférer à un tube à décharge de gaz (12) une sécurité à la fois en cas de défaillance et en cas de mise à l'atmosphère.

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